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        Api
        Cardiff
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        Full Stack Developer

        Renishaw PLC
        Hillesley, GL12 8JR
        Up to £55,000 per annum
        Understanding ofmicroservices architecture,API gateways,
        Understanding ofmicroservices architecture,API gateways,
        NEWFEATURED

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        Principal Backend Engineer

        Develop
        Netherlands
        Up to £0.00 per annum + Flexible depending on experience
        We're working with a consultancy who have a scope of work with a technology-driven organisation who are expanding their engineering function and looking for Lead/Principal and Senior Backend Engineers to join their growing team. Principal Engineer (.NET / Azure) - Hybrid - Netherlands based 12 month contract * Lead, guide, and support backend engineers promoting clean code, high standards, and a collaborative team culture - These roles will play a key part in driving backend technical direction, owning systems at scale, and delivering high-quality, reliable software solutions. * Take full ownership of backend architecture, ensuring systems are scalable, performant, and maintainable as the product evolves * Architect and deliver secure, high-performing APIs that integr
        We're working with a consultancy who have a scope of work with a technology-driven organisation who are expanding their engineering function and looking for Lead/Principal and Senior Backend Engineers to join their growing team. Principal Engineer (.NET / Azure) - Hybrid - Netherlands based 12 month contract * Lead, guide, and support backend engineers promoting clean code, high standards, and a collaborative team culture - These roles will play a key part in driving backend technical direction, owning systems at scale, and delivering high-quality, reliable software solutions. * Take full ownership of backend architecture, ensuring systems are scalable, performant, and maintainable as the product evolves * Architect and deliver secure, high-performing APIs that integr
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        Job Role: Staff Engineer (Informatica / MDM) * Proven experience as a Senior/Staff Engineer within web and mobile application development - Are you a senior engineer who thrives on leading technical strategy, driving engineering excellence, and mentoring others? This is a fantastic opportunity to join a major organisation for some wit experience around MDM Hub Console, IDD (Informatica Data Director) You'll play a key delivery-focused role, supporting multiple squads and working alongside Principal Engineers and senior stakeholders to deliver complex, high-impact initiatives. * Partner with the Principal Engineer (strategy-focused) to shape technical direction - Working Model: Full-Time - Remote (with occasional quarterly workshops/events) Salary: Up to £84,000 + Excellent Benefits -
        Job Role: Staff Engineer (Informatica / MDM) * Proven experience as a Senior/Staff Engineer within web and mobile application development - Are you a senior engineer who thrives on leading technical strategy, driving engineering excellence, and mentoring others? This is a fantastic opportunity to join a major organisation for some wit experience around MDM Hub Console, IDD (Informatica Data Director) You'll play a key delivery-focused role, supporting multiple squads and working alongside Principal Engineers and senior stakeholders to deliver complex, high-impact initiatives. * Partner with the Principal Engineer (strategy-focused) to shape technical direction - Working Model: Full-Time - Remote (with occasional quarterly workshops/events) Salary: Up to £84,000 + Excellent Benefits -
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        FEATURED
        We now have an opportunity for a senior software engineer within the DAQ group to lead a team supporting the Soft Condensed Matter (SCM) and Crystallography (X) Science Groups. As the team leader you will drive both the support for Diamond's data acquisition needs for our users today using our GDA (Generic Data Acquisition) software package, but also our needs for the future in the form of our next generation data acquisition endeavor - Athena. Our software engineers work alongside our scientists to develop innovative and robust solutions to keep Diamond at the forefront of scientific research. The group works closely with scientists, controls, data analysis and information management engineers to continuously develop and improve
        We now have an opportunity for a senior software engineer within the DAQ group to lead a team supporting the Soft Condensed Matter (SCM) and Crystallography (X) Science Groups. As the team leader you will drive both the support for Diamond's data acquisition needs for our users today using our GDA (Generic Data Acquisition) software package, but also our needs for the future in the form of our next generation data acquisition endeavor - Athena. Our software engineers work alongside our scientists to develop innovative and robust solutions to keep Diamond at the forefront of scientific research. The group works closely with scientists, controls, data analysis and information management engineers to continuously develop and improve
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        ProjectEngineer-Rail * 6monthcontract * Sheffield * Upto£600OutsideIR35 * RailExperienceNeeded - RTConsultingareanestablishedGoldERSarmedforcescovenantSME,weareaManagementConsultancywithover15years'experienceindrivinginnovationandtransformationinkeysectors,includingDefence,Local&CentralGovernment,PolicingandTransport. Asaresultofcontinuedsuccess,weareexpandingoursocietyofconsultantstofulfilcurrentandfuturedemandsfromourdefenceportfolio,particularlyoneofthelargestDefenceframeworkswithintheUKwhichwehaveproudlybeensupportingforover5years. EngineeringDelivery * Undertaketechnicaltasksacrosslightraildisciplinesincludingtractionpower,depotupgrades,signalling,communications,andassetmanagement. * Leadschemedevelopmentthroughinvestigation,siteinspections,dataanalysis,design,andconstructionsupervision. * Applyindependentengineeringjudgementtodeliverinnovativesolutions. ProjectM
        ProjectEngineer-Rail * 6monthcontract * Sheffield * Upto£600OutsideIR35 * RailExperienceNeeded - RTConsultingareanestablishedGoldERSarmedforcescovenantSME,weareaManagementConsultancywithover15years'experienceindrivinginnovationandtransformationinkeysectors,includingDefence,Local&CentralGovernment,PolicingandTransport. Asaresultofcontinuedsuccess,weareexpandingoursocietyofconsultantstofulfilcurrentandfuturedemandsfromourdefenceportfolio,particularlyoneofthelargestDefenceframeworkswithintheUKwhichwehaveproudlybeensupportingforover5years. EngineeringDelivery * Undertaketechnicaltasksacrosslightraildisciplinesincludingtractionpower,depotupgrades,signalling,communications,andassetmanagement. * Leadschemedevelopmentthroughinvestigation,siteinspections,dataanalysis,design,andconstructionsupervision. * Applyindependentengineeringjudgementtodeliverinnovativesolutions. ProjectM
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        Founding Engineer

        Corecom Consulting
        London
        £110000 - £130000 per annum + Equity
        Full-Stack Software Engineer - London - 5 days a week - I'm working with a well funded early stage AI platform looking for a versatile full-stack engineer to join the London platform team as one of the first engineers. Location: London, central, fully onsite (early stage, London platform team) Salary: Up to £130,000 - Seniority: 3-8 years | Permanent | Early hire on a small platform team - This role is perfect for someone who loves shipping product, moving fast, and solving novel technical problems that sit at the intersection of data, systems and user experience. What you'll own * Deliver a fast, reliable user-facing platform that real customers use every day * Iterate quickly on product features and infrastructure for novel technical problems * Own slices of the stack end to end, from SQL and backend logic to front
        Full-Stack Software Engineer - London - 5 days a week - I'm working with a well funded early stage AI platform looking for a versatile full-stack engineer to join the London platform team as one of the first engineers. Location: London, central, fully onsite (early stage, London platform team) Salary: Up to £130,000 - Seniority: 3-8 years | Permanent | Early hire on a small platform team - This role is perfect for someone who loves shipping product, moving fast, and solving novel technical problems that sit at the intersection of data, systems and user experience. What you'll own * Deliver a fast, reliable user-facing platform that real customers use every day * Iterate quickly on product features and infrastructure for novel technical problems * Own slices of the stack end to end, from SQL and backend logic to front
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        Engineering Lead

        Method-Resourcing
        AL1, St. Albans
        £85000 - £90000 per annum + Bonus + Shares
        This is a hands-on Engineering Lead role (~30% coding) leading two agile squads through the modernisation of mission-critical systems and preparing for a greenfield front-end rebuild. Lead a hands-on engineering team through a major platform rebuild, moving from PHP to Native JavaScript, while shaping architecture, roadmaps, and upskilling a talented team. * Lead and mentor engineers, driving delivery excellence and best practice. * Partner with Product and Heads of Engineering to plan and execute technical roadmaps. * Manage technical debt, continuous improvement, and engineering quality. * Passionate about coaching, team development, and modern engineering practice. St Albans - (Hybrid) Up to £90,000 + Bonus + Benefits + lucrative shares scheme - Me
        This is a hands-on Engineering Lead role (~30% coding) leading two agile squads through the modernisation of mission-critical systems and preparing for a greenfield front-end rebuild. Lead a hands-on engineering team through a major platform rebuild, moving from PHP to Native JavaScript, while shaping architecture, roadmaps, and upskilling a talented team. * Lead and mentor engineers, driving delivery excellence and best practice. * Partner with Product and Heads of Engineering to plan and execute technical roadmaps. * Manage technical debt, continuous improvement, and engineering quality. * Passionate about coaching, team development, and modern engineering practice. St Albans - (Hybrid) Up to £90,000 + Bonus + Benefits + lucrative shares scheme - Me
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        We're looking for an experienced Contract AWS Cloud Engineer to join a secure government-related project based onsite in Leeds. If you're a contract AWS Cloud Engineer with active enhanced SC or DV clearance looking for you're next exciting project. This role is ideally suited to someone with strong hands-on AWS experience and a solid understanding of cloud security and automation within highly regulated environments. * Design, build, and manage AWS cloud infrastructure in a secure, scalable, and resilient environments. * Integrate AWS security logs and data flows with SIEM platforms (e.g., Splunk). * Support live cloud environments through monitoring, troubleshooting, and performance optimisation. *
        We're looking for an experienced Contract AWS Cloud Engineer to join a secure government-related project based onsite in Leeds. If you're a contract AWS Cloud Engineer with active enhanced SC or DV clearance looking for you're next exciting project. This role is ideally suited to someone with strong hands-on AWS experience and a solid understanding of cloud security and automation within highly regulated environments. * Design, build, and manage AWS cloud infrastructure in a secure, scalable, and resilient environments. * Integrate AWS security logs and data flows with SIEM platforms (e.g., Splunk). * Support live cloud environments through monitoring, troubleshooting, and performance optimisation. *
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        Principal OHL Design Engineer We are seeking a Principal Overhead Line (OHL) Design Engineer to join a growing consultancy that delivers projects across the UK transmission and distribution sector. * Deliver OHL design studies to scope, budget and programme in line with industry standards * 5+ years’ experience in OHL design (transmission or distribution) The company specialises in the design of overhead lines, underground cables and wider energy infrastructure, supporting key national projects that contribute to Net Zero. * Load, strength and foundation design * Developing design processes and tools to improve efficiency * Coaching and mentoring juni
        Principal OHL Design Engineer We are seeking a Principal Overhead Line (OHL) Design Engineer to join a growing consultancy that delivers projects across the UK transmission and distribution sector. * Deliver OHL design studies to scope, budget and programme in line with industry standards * 5+ years’ experience in OHL design (transmission or distribution) The company specialises in the design of overhead lines, underground cables and wider energy infrastructure, supporting key national projects that contribute to Net Zero. * Load, strength and foundation design * Developing design processes and tools to improve efficiency * Coaching and mentoring juni
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        PSA – Engineer, HW and System

        DCV Technologies Limited
        EC1, City of London
        From £400 to £460 per day
        Position: PSA Engineer, HW and System - We are seeking an experienced PSA Engineer Hardware and System to join our EMS e-terra / ADMS Series 3 team. Department: EMS e-terra / ADMS Series 3 - Location: Fully Remote (UK/Europe) Contract Duration: 12 months (with extension opportunity)Contract Type: (UK- Inside IR35), (Europe -B2B), (Permanent contracts available as well UK/Europe) Start Date: November 1, 2025 (Flexible) Budget: Flexible - About the Role - In this role, you will work on mission-critical systems, ensuring the stability, configuration, and continuous improvement of infrastructure supporting our advanced energy management applications. You will collaborate with cross-functional teams to troubleshoot issues, deliver innovative solutions, and maintain high levels of customer satisfaction. Key Responsibilities * Lead system-le
        Position: PSA Engineer, HW and System - We are seeking an experienced PSA Engineer Hardware and System to join our EMS e-terra / ADMS Series 3 team. Department: EMS e-terra / ADMS Series 3 - Location: Fully Remote (UK/Europe) Contract Duration: 12 months (with extension opportunity)Contract Type: (UK- Inside IR35), (Europe -B2B), (Permanent contracts available as well UK/Europe) Start Date: November 1, 2025 (Flexible) Budget: Flexible - About the Role - In this role, you will work on mission-critical systems, ensuring the stability, configuration, and continuous improvement of infrastructure supporting our advanced energy management applications. You will collaborate with cross-functional teams to troubleshoot issues, deliver innovative solutions, and maintain high levels of customer satisfaction. Key Responsibilities * Lead system-le
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        As a Programme Lead Engineer you will you will be responsible for ensuring a through life perspective is taken in the development and management of the Systems, Equipment, People and Process. * Previous experience either as a Project Lead Engineer or a Domain Lead Engineer (e.g. Systems, Hardware, Software) General Dynamics Mission Systems engineers a diverse portfolio of high technology solutions, products and services that enable customers to successfully execute missions across all domains of operation. You will be responsible for meeting project requirements within cost and schedule constraints through detailed planning and monitoring the execution of the programme. Day to day you will provide direction, guidance and support to the development team ensuring that t
        As a Programme Lead Engineer you will you will be responsible for ensuring a through life perspective is taken in the development and management of the Systems, Equipment, People and Process. * Previous experience either as a Project Lead Engineer or a Domain Lead Engineer (e.g. Systems, Hardware, Software) General Dynamics Mission Systems engineers a diverse portfolio of high technology solutions, products and services that enable customers to successfully execute missions across all domains of operation. You will be responsible for meeting project requirements within cost and schedule constraints through detailed planning and monitoring the execution of the programme. Day to day you will provide direction, guidance and support to the development team ensuring that t
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        Rullion is proud to partner with one of the UK's most ambitious energy projects - Hinkley Point C (HPC) - in search of a highly capable Quality Engineer to join the Quality Department. Role: Quality Engineer - CFSI - The QE CFSI will work in close collaboration with all other project functions (e.g. technical directorate, supply chain, etc.) and the supply chain to ensure that project quality is delivered consistently (safely, efficiently and right first time) compliant with the scope of work and quality arrangements. * Position requires academic background or understanding of Quality Management, including best practice * An understanding of Quality Assurance and Quality Control within Manufacturing, major projects or - Position: Cont
        Rullion is proud to partner with one of the UK's most ambitious energy projects - Hinkley Point C (HPC) - in search of a highly capable Quality Engineer to join the Quality Department. Role: Quality Engineer - CFSI - The QE CFSI will work in close collaboration with all other project functions (e.g. technical directorate, supply chain, etc.) and the supply chain to ensure that project quality is delivered consistently (safely, efficiently and right first time) compliant with the scope of work and quality arrangements. * Position requires academic background or understanding of Quality Management, including best practice * An understanding of Quality Assurance and Quality Control within Manufacturing, major projects or - Position: Cont
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        Job Role: Staff Engineer (Adobe AEM/Java) * Proven experience as a Senior/Staff Engineer within web and mobile application development - Are you a senior engineer who thrives on leading technical strategy, driving engineering excellence, and mentoring others? You'll play a key delivery-focused role, supporting multiple squads and working alongside Principal Engineers and senior stakeholders to deliver complex, high-impact initiatives. * Partner with the Principal Engineer (strategy-focused) to shape technical direction - Working Model: Full-Time - Remote (with occasional quarterly workshops/events) Salary: Up to £84,000 + Excellent Benefits - Do you enjoy shaping platforms at scale while staying hands-on with modern technologies? This is a fantastic opportunity to join a major organis
        Job Role: Staff Engineer (Adobe AEM/Java) * Proven experience as a Senior/Staff Engineer within web and mobile application development - Are you a senior engineer who thrives on leading technical strategy, driving engineering excellence, and mentoring others? You'll play a key delivery-focused role, supporting multiple squads and working alongside Principal Engineers and senior stakeholders to deliver complex, high-impact initiatives. * Partner with the Principal Engineer (strategy-focused) to shape technical direction - Working Model: Full-Time - Remote (with occasional quarterly workshops/events) Salary: Up to £84,000 + Excellent Benefits - Do you enjoy shaping platforms at scale while staying hands-on with modern technologies? This is a fantastic opportunity to join a major organis
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        Test Engineer

        Rise Technical Recruitment Limited
        Arnhem, Gelderland
        €38400.00 - €40000 per annum + Annual Bonus + 25 Days Holiday
        They are now looking for a Test Engineer to join their site in Arnhem. Training will be provided on specific machines and programming languages, as well as shadowing from the current Test Engineer to support your onboarding, conducted by a Test Engineer who is retiriring next year! In this role, you will be responsible for setting up, maintaining, and programming test machines, as well as carrying out durability and performance tests for OEM customers. You will work closely with engineers and customers to ensure systems meet requirements for temperature, frequency, and durability. * Maintenance, set-up, and programming of test machinery * Conducting durability, frequency, and temperature tests for OEM customers * Collaborating with
        They are now looking for a Test Engineer to join their site in Arnhem. Training will be provided on specific machines and programming languages, as well as shadowing from the current Test Engineer to support your onboarding, conducted by a Test Engineer who is retiriring next year! In this role, you will be responsible for setting up, maintaining, and programming test machines, as well as carrying out durability and performance tests for OEM customers. You will work closely with engineers and customers to ensure systems meet requirements for temperature, frequency, and durability. * Maintenance, set-up, and programming of test machinery * Conducting durability, frequency, and temperature tests for OEM customers * Collaborating with
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        PREMIUM

        Lead C# / Principal C# Engineer, React, Leadership, Home Based

        Fdo Consulting Limited
        Manchester, Greater Manchester
        £70000 - £80000 per annum + pension, health, WFH
        Lead C# / Principal C# Software Engineer, SaaS, Hands-on engineering role with proven ability to mentor, technically develop a team, take the technical leadership, etc. , Full stack but heavily backend focused. As they continue to grow they are looking for a hands-on Lead Software Engineer with a combination of strong C#/ .net technical skills and proven tech leadership / management skills that will include coaching, mentoring, team collaboration, etc, etc. Utilising agile methodologies you will develop high quality software fortnightly, focusing on scaleability, robustness and continuous improvement. Working with Product Owners, Project Managers and fellow Lead Software Engineers, you will further develop and enhance the product. If you are a skilled
        Lead C# / Principal C# Software Engineer, SaaS, Hands-on engineering role with proven ability to mentor, technically develop a team, take the technical leadership, etc. , Full stack but heavily backend focused. As they continue to grow they are looking for a hands-on Lead Software Engineer with a combination of strong C#/ .net technical skills and proven tech leadership / management skills that will include coaching, mentoring, team collaboration, etc, etc. Utilising agile methodologies you will develop high quality software fortnightly, focusing on scaleability, robustness and continuous improvement. Working with Product Owners, Project Managers and fellow Lead Software Engineers, you will further develop and enhance the product. If you are a skilled
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        We are seeking a highly motivated and technically skilled CPE Tester to join our client's engineering team in Brussels. If you have deep hands-on experience with broadband and cable network technologies, and a passion for testing and validating complex CPE devices, we would like to hear from you. In this role, you will be responsible for testing, validating, and automating the quality assurance processes for a wide range of Customer Premises Equipment within modern broadband ecosystems. This is a technically challenging role, ideal for someone who enjoys working at the intersection of embedded systems, networking, and automation. Key Responsibilities * Test and validate a range of CPE devices, including cable modems, routers, gateways, and STBs * Develop, maintain, and execute automated test scripts using Python * Troubleshoot and diagnose issues acro
        We are seeking a highly motivated and technically skilled CPE Tester to join our client's engineering team in Brussels. If you have deep hands-on experience with broadband and cable network technologies, and a passion for testing and validating complex CPE devices, we would like to hear from you. In this role, you will be responsible for testing, validating, and automating the quality assurance processes for a wide range of Customer Premises Equipment within modern broadband ecosystems. This is a technically challenging role, ideal for someone who enjoys working at the intersection of embedded systems, networking, and automation. Key Responsibilities * Test and validate a range of CPE devices, including cable modems, routers, gateways, and STBs * Develop, maintain, and execute automated test scripts using Python * Troubleshoot and diagnose issues acro
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        Role: Senior Electrical Design Engineer The primary purpose of the principal electrical design engineer role is to lead the Intelligent Customer function for electrical aspects of design projects delivered by subcontractors, on behalf of the MOD. * Prescribe electrical requirements for design projects. * Provide technical oversight of electrical designs through frequent reviews and progress meetings. * Support Design Reviews to ensure that subcontractor electrical designs align with company requirements, industry standards, and regulatory compliance. * Extensive experience of designing electrical systems - This role e
        Role: Senior Electrical Design Engineer The primary purpose of the principal electrical design engineer role is to lead the Intelligent Customer function for electrical aspects of design projects delivered by subcontractors, on behalf of the MOD. * Prescribe electrical requirements for design projects. * Provide technical oversight of electrical designs through frequent reviews and progress meetings. * Support Design Reviews to ensure that subcontractor electrical designs align with company requirements, industry standards, and regulatory compliance. * Extensive experience of designing electrical systems - This role e
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        We are seeking a Lead Operations Engineer to take ownership of day-to-day operations across our legacy technology estate. Role: Lead Operations Engineer The Lead Operations Engineer will play a pivotal role during the transition phase by embedding operational standards, improving monitoring and support processes, and enabling knowledge transfer into ongoing service delivery teams. * Mentor operations engineers and manage knowledge transfer from discovery into business-as-usual operations. * Lead daily operational support of legacy systems, ensuring availability, performance, and resilience. Lead root cause analysis and service improvement initiatives. * Strong leadership in operations and service delivery, with a hands-on approach to problem solving. Location remote with only occasional travel to Client Site - West Midlands - Rate Outside IR35 £500.00 - £525.00
        We are seeking a Lead Operations Engineer to take ownership of day-to-day operations across our legacy technology estate. Role: Lead Operations Engineer The Lead Operations Engineer will play a pivotal role during the transition phase by embedding operational standards, improving monitoring and support processes, and enabling knowledge transfer into ongoing service delivery teams. * Mentor operations engineers and manage knowledge transfer from discovery into business-as-usual operations. * Lead daily operational support of legacy systems, ensuring availability, performance, and resilience. Lead root cause analysis and service improvement initiatives. * Strong leadership in operations and service delivery, with a hands-on approach to problem solving. Location remote with only occasional travel to Client Site - West Midlands - Rate Outside IR35 £500.00 - £525.00
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        What is the average salary for API in Cardiff?

        Average salary per year
        £42,499

        The average salary for a API in Cardiff is £42,499. API in Cardiff salaries range from £32,499 to £55,000.

        Frequently Asked Questions

        How many part time API jobs are there in Cardiff?
        There are 0 part time API jobs within 20 miles of Cardiff available on JustEngineers right now.

        What other similar jobs are there to part time API jobs in Cardiff?
        As well as part time API jobs in Cardiff, you can find part time Engineering, Auditing, Management, amongst many others.