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Locations
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6 API jobs in South East London + 20 miles
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Knowledge in JavaScript, HTML, CSS and understanding of CI/CD, REST API
Knowledge in JavaScript, HTML, CSS and understanding of CI/CD, REST API
PREMIUM
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Lead React Native Engineer / Engineering manager
Lead React Native Engineer / Engineering manager
Sanderson Recruitment
City of London (EC1), EC1
£600 - £700 per day + Outside IR35
Strong API/integration experience: REST / GraphQL, auth flows, contract design and resilience patterns
Strong API/integration experience: REST / GraphQL, auth flows, contract design and resilience patterns
FEATURED
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81357 - Power System & Product Development Engineer
81357 - Power System & Product Development Engineer
CBSbutler Holdings Limited
City of London (EC1)
bonus
Power System & Product Development Engineer - London - Hybrid Salary: £80,574 + 3% bonus - We are seeking a Power System & Product Development Engineer to support the development of a smarter, more flexible electricity network. This role combines power systems engineering with digital product development, focusing on building tools that support flexible connections, DER integration, and DERMS operations across the network. Responsibilities * Lead development of smart grid digital tools supporting flexible connections and DERMS. * Perform power system studies (thermal, voltage, fault level) to identify network constraints. * Develop Python-based tools, data pipelines, dashboards, and APIs. * Use GitHub for version control and collaborative development. * Work with teams across DSO, Planning, Operations, and IT, as well as external partners.
Power System & Product Development Engineer - London - Hybrid Salary: £80,574 + 3% bonus - We are seeking a Power System & Product Development Engineer to support the development of a smarter, more flexible electricity network. This role combines power systems engineering with digital product development, focusing on building tools that support flexible connections, DER integration, and DERMS operations across the network. Responsibilities * Lead development of smart grid digital tools supporting flexible connections and DERMS. * Perform power system studies (thermal, voltage, fault level) to identify network constraints. * Develop Python-based tools, data pipelines, dashboards, and APIs. * Use GitHub for version control and collaborative development. * Work with teams across DSO, Planning, Operations, and IT, as well as external partners.
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Senior Solutions Engineer
Senior Solutions Engineer
SCALERS GROUP LIMITED
The City, City of London (EC2), EC3V
From £80,000 to £90,000 per annum
UK, Remote - Scalers HQ is proud to be partnering with an innovative SaaS FinTech & Payments business in the UK. The SaaS platform our client has built takes away a lot of pain points of payment fragmentation. Were looking for a Senior Solution Engineer, ideally with SaaS or Payments background to contribute towards ambitious growth plans across EMEA. This is an exciting time to join our FinTech partner, and youll join a scaling a team that are rapidly growing. Responsibilities * Communicate with C-suite and senior leaders across commercial and tech to support them in building incredible experiences for their customers * Writing integration plans and sample code for sellers to assist them in implementing their own personalised integration * Lead technical discovery and solution design for global enterprises with complex requirements. * Mentor new & junior members
UK, Remote - Scalers HQ is proud to be partnering with an innovative SaaS FinTech & Payments business in the UK. The SaaS platform our client has built takes away a lot of pain points of payment fragmentation. Were looking for a Senior Solution Engineer, ideally with SaaS or Payments background to contribute towards ambitious growth plans across EMEA. This is an exciting time to join our FinTech partner, and youll join a scaling a team that are rapidly growing. Responsibilities * Communicate with C-suite and senior leaders across commercial and tech to support them in building incredible experiences for their customers * Writing integration plans and sample code for sellers to assist them in implementing their own personalised integration * Lead technical discovery and solution design for global enterprises with complex requirements. * Mentor new & junior members
Join our team here at StepStone and youll be responsible for providing technical leadership to all engineering and development areas across your domain, developing and executing an engineering strategy aligned to the portfolio and global tech strategies. Working in the Design and Platform Performance domain, you willlead the technology side of web and mobile analytics for a platform with over 50 million visits each month, deliver the best user experiences and personalisation for talent and talent seekers. We built in-house large scale tracking platform, powered by Tealium, Kafka and Adobe Analytics, and successfully rolled it out to 10 of our brands. Along with the tracking we are owners of our AB testing tool Optimizely, our in-house Design System Genesys and Frontend Framework, which when put together powers the product development at scale using a data driven ...
Join our team here at StepStone and youll be responsible for providing technical leadership to all engineering and development areas across your domain, developing and executing an engineering strategy aligned to the portfolio and global tech strategies. Working in the Design and Platform Performance domain, you willlead the technology side of web and mobile analytics for a platform with over 50 million visits each month, deliver the best user experiences and personalisation for talent and talent seekers. We built in-house large scale tracking platform, powered by Tealium, Kafka and Adobe Analytics, and successfully rolled it out to 10 of our brands. Along with the tracking we are owners of our AB testing tool Optimizely, our in-house Design System Genesys and Frontend Framework, which when put together powers the product development at scale using a data driven ...
PREMIUM
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Head of Quality Engineering
Head of Quality Engineering
Infoplus Technologies UK Ltd
City of London (EC3M)
From £650 to £700 per day
API Automation (REST Assured, Karate, Postman)
API Automation (REST Assured, Karate, Postman)
16 exact matches jobs are outside your preferred location
Senior Android Developer – Kotlin / Mobile Applications
Senior Android Developer – Kotlin / Mobile Applications
Intelligent Talent Solutions Ltd
Bracknell (RG12)
From £68,000 to £88,000 per annum Pension, staff discounts, medical
Implement robust REST API integrations
Implement robust REST API integrations
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Associate Director, Engineering (Education)
Associate Director, Engineering (Education)
IRIS Recruitment
Slough (SL3)
Competitive plus bonus and benefits
Ensure scalable, API-first, cloud-native platform design * Strong understanding of DevOps, SRE, API architecture and AI integration
Ensure scalable, API-first, cloud-native platform design * Strong understanding of DevOps, SRE, API architecture and AI integration
FEATURED
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Well versed in industry standards such as ISO, API and HI with hands-on experience in design validation and product testing.
Well versed in industry standards such as ISO, API and HI with hands-on experience in design validation and product testing.
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£100k - Equity | Remote Flexibility - Typescript | Azure | Python | LLM | Terraform - The Company - We’re working with an early-stage technology company bringing digital transformation to traditionally manual supply chain and product data processes. They are looking for an experienced engineer who can balance hands-on engineering with technical strategy as the business moves through its next phase of growth. This role suits someone who enjoys operating in a small but growing team, is motivated by building solutions, solving complex problems, and is comfortable rolling up their sleeves to deliver. The environment is fast-paced, where priorities can evolve quickly and ambiguity is often part of the journey. The successful candidate will be excited by the autonomy of an early-stage environment and the opportunity to shape the technical direction of a high-potential B2B SaaS platform.
£100k - Equity | Remote Flexibility - Typescript | Azure | Python | LLM | Terraform - The Company - We’re working with an early-stage technology company bringing digital transformation to traditionally manual supply chain and product data processes. They are looking for an experienced engineer who can balance hands-on engineering with technical strategy as the business moves through its next phase of growth. This role suits someone who enjoys operating in a small but growing team, is motivated by building solutions, solving complex problems, and is comfortable rolling up their sleeves to deliver. The environment is fast-paced, where priorities can evolve quickly and ambiguity is often part of the journey. The successful candidate will be excited by the autonomy of an early-stage environment and the opportunity to shape the technical direction of a high-potential B2B SaaS platform.
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Our client is seeking a contract Threat Detection Engineer to support the ongoing delivery of detection engineering activities within a busy SOC environment. This role is centred on hands-on engineering and execution, ensuring detection content, automations, and integrations are delivered effectively and aligned to operational priorities. Working closely with threat hunting and SOC teams, you will translate detection requirements into practical outcomes, contributing directly to sprint-based delivery and continuous service improvement. This is a highly technical role suited to someone who enjoys building, tuning, and optimising detection capabilities across modern security platforms. Key Responsibilities * Develop and deliver detection content in line with sprint priorities and operational requirements
Our client is seeking a contract Threat Detection Engineer to support the ongoing delivery of detection engineering activities within a busy SOC environment. This role is centred on hands-on engineering and execution, ensuring detection content, automations, and integrations are delivered effectively and aligned to operational priorities. Working closely with threat hunting and SOC teams, you will translate detection requirements into practical outcomes, contributing directly to sprint-based delivery and continuous service improvement. This is a highly technical role suited to someone who enjoys building, tuning, and optimising detection capabilities across modern security platforms. Key Responsibilities * Develop and deliver detection content in line with sprint priorities and operational requirements
With over 300 million downloads and processing 5+ billion images annually, we serve both individual creators and major enterprises like Amazon, DoorDash, and Decathlon through our B2C app and B2B API solutions. * Role: Senior API Engineer (Fast API/Python) Our Image Editing API enables anyone to easily create high-quality images with a variety of AI-powered features including background removal, AI shadows, AI backgrounds * You will collaborate with your team to prioritize and implement the most impactful features for the API. * You will get fast feedback from API users and will iterate quickly (we update the API several times a week). You will follow the usage of the API and make decisions based on that. * The API is growing fast and sits at the intersection of developer experience and state-of-the-art AI image models.
With over 300 million downloads and processing 5+ billion images annually, we serve both individual creators and major enterprises like Amazon, DoorDash, and Decathlon through our B2C app and B2B API solutions. * Role: Senior API Engineer (Fast API/Python) Our Image Editing API enables anyone to easily create high-quality images with a variety of AI-powered features including background removal, AI shadows, AI backgrounds * You will collaborate with your team to prioritize and implement the most impactful features for the API. * You will get fast feedback from API users and will iterate quickly (we update the API several times a week). You will follow the usage of the API and make decisions based on that. * The API is growing fast and sits at the intersection of developer experience and state-of-the-art AI image models.
Big banks and enterprises use our API, which means our search and validation engines need to be lightning-fast and bulletproof, even when our biggest partners turn on the tap.
Big banks and enterprises use our API, which means our search and validation engines need to be lightning-fast and bulletproof, even when our biggest partners turn on the tap.
Full-Stack Delivery: Deploy production-grade features across the platform, including real-time monitoring dashboards, policy enforcement engines, API integrations, and the agent orchestration layers. * Take-Home or Pair Session (23 hours): A practical exercise involving the construction of a small agentic workflow using Claudes API.
Full-Stack Delivery: Deploy production-grade features across the platform, including real-time monitoring dashboards, policy enforcement engines, API integrations, and the agent orchestration layers. * Take-Home or Pair Session (23 hours): A practical exercise involving the construction of a small agentic workflow using Claudes API.
Director, Knowledge Platform Engineering (relocate to Singapore)
Director, Knowledge Platform Engineering (relocate to Singapore)
Airwallex (UK) Limited
London
£300,000 - £330,000 a year
These include reusable analytical workflows, agent-callable tools, automated pipelines, API endpoints, and transformation primitives.
These include reusable analytical workflows, agent-callable tools, automated pipelines, API endpoints, and transformation primitives.
Synthesia is the worlds leading AI video platform for business, used by over 90% of the Fortune 100. Founded in 2017, the company is headquartered in London, with offices and teams across Europe and the US. As AI continues to shape the way we live and work, Synthesia develops products to enhance visual communication and enterprise skill development, helping people work better and stay at the center of successful organizations. Following our recent Series E funding round, where we raised $200 million, our valuation stands at $4 billion. Our total funding exceeds $530 million from premier investors including Accel, NVentures (Nvidia's VC arm), Kleiner Perkins, GV, and Evantic Capital, alongside the founders and operators of Stripe, Datadog, Miro, and Webflow. About the role - Lead the delivery of complex engineering projects in AI-powered video, avatar rendering, and ...
Synthesia is the worlds leading AI video platform for business, used by over 90% of the Fortune 100. Founded in 2017, the company is headquartered in London, with offices and teams across Europe and the US. As AI continues to shape the way we live and work, Synthesia develops products to enhance visual communication and enterprise skill development, helping people work better and stay at the center of successful organizations. Following our recent Series E funding round, where we raised $200 million, our valuation stands at $4 billion. Our total funding exceeds $530 million from premier investors including Accel, NVentures (Nvidia's VC arm), Kleiner Perkins, GV, and Evantic Capital, alongside the founders and operators of Stripe, Datadog, Miro, and Webflow. About the role - Lead the delivery of complex engineering projects in AI-powered video, avatar rendering, and ...
About Sano - Mission; what we do * accelerating the worlds transition to personalised medicine - Purpose; why we do it * to speed up development of life-saving treatments for those with limited options - Vision; where were going * become the worlds best source of patient-in-the-loop genomic and health data for precision medicine development - Curious to dive deeper? Read more about what we do here - Brief into to the role, who they are reporting to,... * Role - Product Engineer * Salary - 80,000 - 90,000 * Location - UK (remote only) * Identifying and prioritising the right problems to solve , focusing on meaningful customer outcomes and making smart trade-offs to maximise impact with limited time and resources. * Owning features end-to-end , from early discovery and technical input through design, implementation, testing, and release.
About Sano - Mission; what we do * accelerating the worlds transition to personalised medicine - Purpose; why we do it * to speed up development of life-saving treatments for those with limited options - Vision; where were going * become the worlds best source of patient-in-the-loop genomic and health data for precision medicine development - Curious to dive deeper? Read more about what we do here - Brief into to the role, who they are reporting to,... * Role - Product Engineer * Salary - 80,000 - 90,000 * Location - UK (remote only) * Identifying and prioritising the right problems to solve , focusing on meaningful customer outcomes and making smart trade-offs to maximise impact with limited time and resources. * Owning features end-to-end , from early discovery and technical input through design, implementation, testing, and release.
Job Title: Senior Engineer I - Location: London, Bristol or Edinburgh (Including Hybrid) Salary: £60,000 - £82,500 - Team: Developer Experience - Reporting To: Head of Engineering - Closing date: Friday 30th March 2026 - This role is based in the UK and requires an existing right to work in the UK. At this time, we are not able to offer visa sponsorship for this role. We are committed to building a diverse, global team and our sponsorship policy is evaluated on a role-by-role basis. We encourage you to keep an eye on our careers site to stay informed about future opportunities where we are able to offer visa sponsorship. Kaluza is the Energy Intelligence Platform, turning energy complexity into seamless coordination. We help energy companies overcome today's challenges while accelerating the shift to a clean, electrified future.
Job Title: Senior Engineer I - Location: London, Bristol or Edinburgh (Including Hybrid) Salary: £60,000 - £82,500 - Team: Developer Experience - Reporting To: Head of Engineering - Closing date: Friday 30th March 2026 - This role is based in the UK and requires an existing right to work in the UK. At this time, we are not able to offer visa sponsorship for this role. We are committed to building a diverse, global team and our sponsorship policy is evaluated on a role-by-role basis. We encourage you to keep an eye on our careers site to stay informed about future opportunities where we are able to offer visa sponsorship. Kaluza is the Energy Intelligence Platform, turning energy complexity into seamless coordination. We help energy companies overcome today's challenges while accelerating the shift to a clean, electrified future.
About Sano - Mission: what we do * Accelerating the worlds transition to personalised medicine - Purpose: why we do it * To speed up development of life-saving treatments for those with limited options - Vision: where were going * Become the worlds best source of patient-in-the-loop genomic and health data for precision medicine development - Curious to dive deeper? Read more about what we do here - Brief into to the role, who they are reporting to,... * Role - VP Data & Engineering * Salary -£120,000 to £150,000 depending on experience * Location - UK (remote only) As VP of Engineering & Data, youll be a hands-on, strategic leader for a small high-impact team. Youll own the technical direction and delivery for our engineering function, including front-end, backend, and platform disciplines. You will be instrumental in ensuring we can reliably ingest, curate, and serve high-quality ...
About Sano - Mission: what we do * Accelerating the worlds transition to personalised medicine - Purpose: why we do it * To speed up development of life-saving treatments for those with limited options - Vision: where were going * Become the worlds best source of patient-in-the-loop genomic and health data for precision medicine development - Curious to dive deeper? Read more about what we do here - Brief into to the role, who they are reporting to,... * Role - VP Data & Engineering * Salary -£120,000 to £150,000 depending on experience * Location - UK (remote only) As VP of Engineering & Data, youll be a hands-on, strategic leader for a small high-impact team. Youll own the technical direction and delivery for our engineering function, including front-end, backend, and platform disciplines. You will be instrumental in ensuring we can reliably ingest, curate, and serve high-quality ...
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Full Stack Engineer - Outisde IR35 up to £525 - Intial 4 month contract, high chance of extension - I am recruiting for multiple Full Stack Engineers to help our client build scalable, high-performance applications and contribute across both backend and frontend systems. This role involves working on modern production systems, building APIs and services, and collaborating with cross-functional teams to deliver reliable and user-focused products. Key Responsibilities * Build prototypes and evolve them into scalable, production-ready applications * Develop and maintain backend services and APIs in Node/Python * Contribute to frontend development, building responsive and intuitive user interfaces in React * Design and implement data workflows and system integrations * Work with cloud infrastructure and distributed systems
Full Stack Engineer - Outisde IR35 up to £525 - Intial 4 month contract, high chance of extension - I am recruiting for multiple Full Stack Engineers to help our client build scalable, high-performance applications and contribute across both backend and frontend systems. This role involves working on modern production systems, building APIs and services, and collaborating with cross-functional teams to deliver reliable and user-focused products. Key Responsibilities * Build prototypes and evolve them into scalable, production-ready applications * Develop and maintain backend services and APIs in Node/Python * Contribute to frontend development, building responsive and intuitive user interfaces in React * Design and implement data workflows and system integrations * Work with cloud infrastructure and distributed systems
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Senior GraphQL Engineer (Federation) TypeScript | Node.js | Kubernetes
Senior GraphQL Engineer (Federation) TypeScript | Node.js | Kubernetes
Staffworx Limited
UK
MARKET RATES, OUTSIDE IR35, hybrid, 2 days on site week
Own end-to-end GraphQL API delivery: schema design through to production integration, focusing on performance, maintainability, security, and scalability. * Strong commercial experience delivering Federated GraphQL in production (schema-first design, supergraph/subgraph architecture, resolvers, schema governance, and API evolution). * Testing experience with modern frameworks such as Vitest and Playwright (API + end-to-end).
Own end-to-end GraphQL API delivery: schema design through to production integration, focusing on performance, maintainability, security, and scalability. * Strong commercial experience delivering Federated GraphQL in production (schema-first design, supergraph/subgraph architecture, resolvers, schema governance, and API evolution). * Testing experience with modern frameworks such as Vitest and Playwright (API + end-to-end).
Apply now - Date: 13 Mar 2026 - Location: London region, GB - 81357 - Power System & Product Development Engineer - This Power System & Product Development Engineer will report to the Network Access Manager and will work within DSO directorate based in our London office. You will be a permanent employee. You will attract a salary of £80,574.00 and a bonus of 3%. This role can also offer blended working after probationary period (6 months) - 3 days in the office and 2 remote - Close Date: 26/03/2026 - We also provide the following additional benefits * 25 Days Annual Leave plus bank holidays. * Reservist Leave - Additional 18 days full pay and 22 unpaid * Personal Pension Plan - Personal contribution rates of 4% or 5% (UK Power Networks will make a corresponding contribution of 8% or 10%) * Tenancy Loan Deposit Scheme, Season Ticket Loan
Apply now - Date: 13 Mar 2026 - Location: London region, GB - 81357 - Power System & Product Development Engineer - This Power System & Product Development Engineer will report to the Network Access Manager and will work within DSO directorate based in our London office. You will be a permanent employee. You will attract a salary of £80,574.00 and a bonus of 3%. This role can also offer blended working after probationary period (6 months) - 3 days in the office and 2 remote - Close Date: 26/03/2026 - We also provide the following additional benefits * 25 Days Annual Leave plus bank holidays. * Reservist Leave - Additional 18 days full pay and 22 unpaid * Personal Pension Plan - Personal contribution rates of 4% or 5% (UK Power Networks will make a corresponding contribution of 8% or 10%) * Tenancy Loan Deposit Scheme, Season Ticket Loan
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Founding Engineer (EnergyTech / AI) Engineers here take ownership of problems end-to-end, from shaping early ideas through to delivering production features used by customers. * Experience as a Full-Stack Engineer building production systems Engineers who thrive here tend to enjoy working close to the problem, communicating clearly across technical and non-technical teams, and taking initiative rather than waiting for direction. London | Hybrid (3 days onsite) | £70k-£120k + Equity - A venture-backed EnergyTech start-up is building a new type of power company designed for the electrified future. As renewable energy adoption accelerates, the challenge is no longer just generating power, but storing, managing, and intelligently dispatching it. This team is developing software that sits at the centre of that transition, enabling a new generation of energy suppliers built around flexibility, storage, and ...
Founding Engineer (EnergyTech / AI) Engineers here take ownership of problems end-to-end, from shaping early ideas through to delivering production features used by customers. * Experience as a Full-Stack Engineer building production systems Engineers who thrive here tend to enjoy working close to the problem, communicating clearly across technical and non-technical teams, and taking initiative rather than waiting for direction. London | Hybrid (3 days onsite) | £70k-£120k + Equity - A venture-backed EnergyTech start-up is building a new type of power company designed for the electrified future. As renewable energy adoption accelerates, the challenge is no longer just generating power, but storing, managing, and intelligently dispatching it. This team is developing software that sits at the centre of that transition, enabling a new generation of energy suppliers built around flexibility, storage, and ...
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The Role: Engineering Manager (AI Enablement) As the Engineering Manager for this team, you will lead a small, high-impact group that builds and operationalises internal AI capabilities, partners with teams to remove adoption friction, and ensures governed, scalable use of AI. Our AI Enablement team accelerates how product and engineering teams deliver value by enabling safe, effective, high-quality adoption of AI-native tools, practices and agentic workflows. * Partner with security, compliance, data and architecture to ensure governed, safe AI adoption; translate emerging risks and constraints into product and engineering decisions that scale. * Experience leading engineering teams that build and scale end-to-end production systems. * Hands on experience with AI models, tools and frameworks: agent orchestration, prompt engineering, RAG pipelines, evaluation frameworks, ...
The Role: Engineering Manager (AI Enablement) As the Engineering Manager for this team, you will lead a small, high-impact group that builds and operationalises internal AI capabilities, partners with teams to remove adoption friction, and ensures governed, scalable use of AI. Our AI Enablement team accelerates how product and engineering teams deliver value by enabling safe, effective, high-quality adoption of AI-native tools, practices and agentic workflows. * Partner with security, compliance, data and architecture to ensure governed, safe AI adoption; translate emerging risks and constraints into product and engineering decisions that scale. * Experience leading engineering teams that build and scale end-to-end production systems. * Hands on experience with AI models, tools and frameworks: agent orchestration, prompt engineering, RAG pipelines, evaluation frameworks, ...