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        78 API jobs in Watford + 20 miles

        289 exact matches jobs are outside your preferred location

        C# Developer - Trade Capture

        Harvey Nash
        London
        £600 - £800 per day
        *outside iR35* What You'll Be Doing * Designing and developing enterprise-grade solutions in an Agile team. * Building and maintaining middleware services using C#, REST APIs, FIX messaging, XML, and Microservices. * Leading architecture discussions, code reviews, and release management. * Collaborating with users and cross-functional teams to define and execute testing strategies. * Mentoring junior developers and contributing to internal best practices. What You Bring * A strong academic background in Computer Science, Engineering, or a related field. * Proven experience in commodities trading, especially with derivatives and platforms like ICE, CME, NASDAQ, Trayport, or TT. * Deep knowledge of C# .NET, RESTful services, and microservice architecture. * Hands-on experience with FIX messaging, XML, AMQ, and ideally nHibernate, OData, and TDD.
        *outside iR35* What You'll Be Doing * Designing and developing enterprise-grade solutions in an Agile team. * Building and maintaining middleware services using C#, REST APIs, FIX messaging, XML, and Microservices. * Leading architecture discussions, code reviews, and release management. * Collaborating with users and cross-functional teams to define and execute testing strategies. * Mentoring junior developers and contributing to internal best practices. What You Bring * A strong academic background in Computer Science, Engineering, or a related field. * Proven experience in commodities trading, especially with derivatives and platforms like ICE, CME, NASDAQ, Trayport, or TT. * Deep knowledge of C# .NET, RESTful services, and microservice architecture. * Hands-on experience with FIX messaging, XML, AMQ, and ideally nHibernate, OData, and TDD.
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        *outside iR35* What You'll Be Doing * Designing and developing enterprise-grade solutions in an Agile team. * Building and maintaining middleware services using C#, REST APIs, FIX messaging, XML, and Microservices. * Leading architecture discussions, code reviews, and release management. * Collaborating with users and cross-functional teams to define and execute testing strategies. * Mentoring junior developers and contributing to internal best practices. What You Bring * A strong academic background in Computer Science, Engineering, or a related field. * Proven experience in commodities trading, especially with derivatives and platforms like ICE, CME, NASDAQ, Trayport, or TT. * Deep knowledge of C# .NET, RESTful services, and microservice architecture. * Hands-on experience with FIX messaging, XML, AMQ, and ideally nHibernate, OData, and TDD.
        *outside iR35* What You'll Be Doing * Designing and developing enterprise-grade solutions in an Agile team. * Building and maintaining middleware services using C#, REST APIs, FIX messaging, XML, and Microservices. * Leading architecture discussions, code reviews, and release management. * Collaborating with users and cross-functional teams to define and execute testing strategies. * Mentoring junior developers and contributing to internal best practices. What You Bring * A strong academic background in Computer Science, Engineering, or a related field. * Proven experience in commodities trading, especially with derivatives and platforms like ICE, CME, NASDAQ, Trayport, or TT. * Deep knowledge of C# .NET, RESTful services, and microservice architecture. * Hands-on experience with FIX messaging, XML, AMQ, and ideally nHibernate, OData, and TDD.
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        Lead Salesforce Developer Contract (Outside IR35) Fully Remote - Day Rate: Competitive, open to negotiation - Duration: 6 months+ Working Arrangements: Fully Remote - Interview: 1 Video Call - About the Role - We are seeking an experienced Lead Salesforce Developer for a hands-on leadership role within a fast-growing, innovative financial services environment. You will take ownership of the Salesforce platform, leading a small, talented team and driving technical excellence across the business. What Youll Do * Lead the design, development, and deployment of Salesforce solutions * Collaborate with stakeholders to gather requirements and deliver tailored functionality * Manage and mentor a team of Salesforce professionals (Administrators, Analysts, and Developers) * Ensure data integrity, oversee integrations, and manage complex data models
        Lead Salesforce Developer Contract (Outside IR35) Fully Remote - Day Rate: Competitive, open to negotiation - Duration: 6 months+ Working Arrangements: Fully Remote - Interview: 1 Video Call - About the Role - We are seeking an experienced Lead Salesforce Developer for a hands-on leadership role within a fast-growing, innovative financial services environment. You will take ownership of the Salesforce platform, leading a small, talented team and driving technical excellence across the business. What Youll Do * Lead the design, development, and deployment of Salesforce solutions * Collaborate with stakeholders to gather requirements and deliver tailored functionality * Manage and mentor a team of Salesforce professionals (Administrators, Analysts, and Developers) * Ensure data integrity, oversee integrations, and manage complex data models
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        Role: QA Engineer - Location: London - Type: Hybrid / Remote - Salary: TBC - Contract Type: Permanent - Myn is an AI driven marketplace that connects the candidates, clients and recruiters. Myn collaborates with leading employers to offer exclusive, carefully matched permanent positions. Our Recruitment Partners all have extensive industry experience, and work with a select group of niche clients, to deliver the best possible experience to the candidate. We are working with a fast-growing, product-led tech company and we are looking for a QA Engineer whos passionate about catching bugs, improving processes and making sure every release is rock solid. * Design and execute manual and automated test plans across web and mobile platforms * Collaborate with developers, designers, and PMs to ensure quality from ideation to release
        Role: QA Engineer - Location: London - Type: Hybrid / Remote - Salary: TBC - Contract Type: Permanent - Myn is an AI driven marketplace that connects the candidates, clients and recruiters. Myn collaborates with leading employers to offer exclusive, carefully matched permanent positions. Our Recruitment Partners all have extensive industry experience, and work with a select group of niche clients, to deliver the best possible experience to the candidate. We are working with a fast-growing, product-led tech company and we are looking for a QA Engineer whos passionate about catching bugs, improving processes and making sure every release is rock solid. * Design and execute manual and automated test plans across web and mobile platforms * Collaborate with developers, designers, and PMs to ensure quality from ideation to release
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        Role Full Stack Developer - Location - London (Remote) Salary - £70K - £85K - Role Type Permanent - Myn is an AI driven marketplace that connects the candidates, clients and recruiters. Myn collaborates with leading employers to offer exclusive, carefully matched permanent positions. Overview - Are you a talented Full Stack Developer eager to make an immediate impact on exciting projects? Our client is seeking an experienced Full Stack development professional for a hybrid position to be based in Central London, but operating remotely * Design and implement robust web applications using cutting-edge technologies and frameworks. * Collaborate with cross-functional teams to drive the full development lifecycle, from concept to deployment. * Engage in continuous learning and professional development, enhancing your skills and career prospects.
        Role Full Stack Developer - Location - London (Remote) Salary - £70K - £85K - Role Type Permanent - Myn is an AI driven marketplace that connects the candidates, clients and recruiters. Myn collaborates with leading employers to offer exclusive, carefully matched permanent positions. Overview - Are you a talented Full Stack Developer eager to make an immediate impact on exciting projects? Our client is seeking an experienced Full Stack development professional for a hybrid position to be based in Central London, but operating remotely * Design and implement robust web applications using cutting-edge technologies and frameworks. * Collaborate with cross-functional teams to drive the full development lifecycle, from concept to deployment. * Engage in continuous learning and professional development, enhancing your skills and career prospects.
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        Job Title: Observability Developer / Engineer - Location: Hybrid (UK, with travel as required) Employment Type: Full-time - This role is with Morela please respond to for further informaiton - Do you want to be part of something special? Morela is proud to represent our exclusive client, a fast-growing start-up transforming Service Operations. Led by industry leaders with a proven track record of building and scaling successful businesses, this company is redefining how enterprises monitor, manage, and optimise IT operations. This is your chance to join a team shaping the future of observability and operational intelligence from the ground up. We are seeking a skilled Observability Developer to design, build, and optimise observability solutions that help enterprise clients gain actionable insights from their logs, metrics, traces, and events.
        Job Title: Observability Developer / Engineer - Location: Hybrid (UK, with travel as required) Employment Type: Full-time - This role is with Morela please respond to for further informaiton - Do you want to be part of something special? Morela is proud to represent our exclusive client, a fast-growing start-up transforming Service Operations. Led by industry leaders with a proven track record of building and scaling successful businesses, this company is redefining how enterprises monitor, manage, and optimise IT operations. This is your chance to join a team shaping the future of observability and operational intelligence from the ground up. We are seeking a skilled Observability Developer to design, build, and optimise observability solutions that help enterprise clients gain actionable insights from their logs, metrics, traces, and events.
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        Business Analyst - IT Software Consultancy

        Octad Recruitment Consultants (Octad Ltd )
        BR1, Bromley
        From £40,000 to £60,000 per annum Good Benefits
        ThisvibrantandexpandingcompanyarelookingforaBusinessAnalysttoworkcloselywiththeCEOinthisexcitingphaseoftheirexpansion.,TheCompanyisanend-to-enddigitalsolutionorganisation. TheyarelookingforanexperiencedBusinessAnalysttojointheirteam. Inthisrole,youllbethebridgebetweenbusinessneedsandtechnicalsolutions-gatheringrequirements,analysingprocesses,anddeliveringactionableinsightsthathelpguideproductdevelopmentandbusinessstrategy. ThedevelopmentteamarebasedoverseasinSouthAfricaandThailand,withtheCTOandasystemsmanager/UATpersonbeingtheonlyUKbasedpartoftheteam. Thisroleiskeyinthatitwillbeaseniorandkeymemberofthedevelopmentteamwhichwillincludearchitectureandstrategydecisions. Collaboratewithstakeholderstogatheranddefinebusinessrequirements - Translatebusinessneedsintofunctionalandtechnicalspecifications - Analyseexistingprocessesandrecommendimprovementstoincreaseefficiencyandsca
        ThisvibrantandexpandingcompanyarelookingforaBusinessAnalysttoworkcloselywiththeCEOinthisexcitingphaseoftheirexpansion.,TheCompanyisanend-to-enddigitalsolutionorganisation. TheyarelookingforanexperiencedBusinessAnalysttojointheirteam. Inthisrole,youllbethebridgebetweenbusinessneedsandtechnicalsolutions-gatheringrequirements,analysingprocesses,anddeliveringactionableinsightsthathelpguideproductdevelopmentandbusinessstrategy. ThedevelopmentteamarebasedoverseasinSouthAfricaandThailand,withtheCTOandasystemsmanager/UATpersonbeingtheonlyUKbasedpartoftheteam. Thisroleiskeyinthatitwillbeaseniorandkeymemberofthedevelopmentteamwhichwillincludearchitectureandstrategydecisions. Collaboratewithstakeholderstogatheranddefinebusinessrequirements - Translatebusinessneedsintofunctionalandtechnicalspecifications - Analyseexistingprocessesandrecommendimprovementstoincreaseefficiencyandsca
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        CyberArk Secret Manager Engineer | Freelance | London /Paris / Brussels / Hybrid (8 days/month onsite) Duration: 12 months - Rate: Flexible - Inside of IR35 - We're looking for an experienced CyberArk Engineer to join Euroclear's Chief Information Security Office (CISO) within the Identity and Access Management (IDAM) team. This is a fantastic opportunity to play a key role in strengthening Euroclear's Privileged Access Management (PAM) posture by deploying and integrating CyberArk Secret Manager across a complex enterprise environment. You'll lead the end-to-end implementation of CyberArk's Application Access Manager (AAM) capabilities - including Credential Provider (CP), Central Credential Provider (CCP), and Application Service Credential Provider (ASCP). Your focus will be on enabling secure, automated, and compliant management of service and functional accounts
        CyberArk Secret Manager Engineer | Freelance | London /Paris / Brussels / Hybrid (8 days/month onsite) Duration: 12 months - Rate: Flexible - Inside of IR35 - We're looking for an experienced CyberArk Engineer to join Euroclear's Chief Information Security Office (CISO) within the Identity and Access Management (IDAM) team. This is a fantastic opportunity to play a key role in strengthening Euroclear's Privileged Access Management (PAM) posture by deploying and integrating CyberArk Secret Manager across a complex enterprise environment. You'll lead the end-to-end implementation of CyberArk's Application Access Manager (AAM) capabilities - including Credential Provider (CP), Central Credential Provider (CCP), and Application Service Credential Provider (ASCP). Your focus will be on enabling secure, automated, and compliant management of service and functional accounts
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        Systems Manager - Oracle Fusion Specialist

        EFCI Group Ltd
        OX4, Oxford
        From £75,000 to £90,000 per annum bonus + travel allowance
        Lead Enterprise Systems for a Visionary Global Research & Development Organisation - Job Title: Systems Manager - Department: Technology - Reports to: Head of Application Integration Services - Location: South Oxford - Effective Date: ASAP - About the Organisation - We are a rapidly growing, mission-driven organisation focused on translating pioneering science and advanced technology into tangible, end-to-end solutions for some of humanity's most complex challenges. Our work is structured around high-impact humane endeavours, including health and medical science, sustainable resource management, clean energy, and advanced robotics/AI. We operate at the intersection of deep research and product development, dedicated to turning scientific breakthroughs into practical applications with high global impact. We are committed to long-term innovation and sustainability.
        Lead Enterprise Systems for a Visionary Global Research & Development Organisation - Job Title: Systems Manager - Department: Technology - Reports to: Head of Application Integration Services - Location: South Oxford - Effective Date: ASAP - About the Organisation - We are a rapidly growing, mission-driven organisation focused on translating pioneering science and advanced technology into tangible, end-to-end solutions for some of humanity's most complex challenges. Our work is structured around high-impact humane endeavours, including health and medical science, sustainable resource management, clean energy, and advanced robotics/AI. We operate at the intersection of deep research and product development, dedicated to turning scientific breakthroughs into practical applications with high global impact. We are committed to long-term innovation and sustainability.
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        Contract Type:Permanent - About the Role - We're looking for an experienced Data Integration Manager to take ownership of how data moves, integrates, and performs across our business. This is a strategic role that sits at the intersection of technology, operations, and business value, ensuring our financial, commercial, and operational data flows are reliable, accurate, and enable smarter decision-making. You'll be the technical owner of our integration partnerships, lead a small specialist team, and work closely with Finance, Operations, and Commercial stakeholders to modernise processes through better data. If you're someone who understands both the technical complexity of enterprise data and the business outcomes it should deliver, we'd love to hear from you. What You'll Be Doing - Leading Enterprise Integration & Data Operations
        Contract Type:Permanent - About the Role - We're looking for an experienced Data Integration Manager to take ownership of how data moves, integrates, and performs across our business. This is a strategic role that sits at the intersection of technology, operations, and business value, ensuring our financial, commercial, and operational data flows are reliable, accurate, and enable smarter decision-making. You'll be the technical owner of our integration partnerships, lead a small specialist team, and work closely with Finance, Operations, and Commercial stakeholders to modernise processes through better data. If you're someone who understands both the technical complexity of enterprise data and the business outcomes it should deliver, we'd love to hear from you. What You'll Be Doing - Leading Enterprise Integration & Data Operations
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        We are seeking an experienced Product Engagement specialist to join the Analytics Client Engagement team in London, where you'll drive the narrative strategy behind some of LSEGs most impactful financial analytics products and experiences. As part of our high-performing client insight and engagement team, you will take a lead role to craft and scale brilliant narratives and digital experiences across the Analytics product portfolio for our growing client base and digital experiences. We're looking for a strategic storyteller to lead narrative research and development across our Analytics product and proposition portfolio, someone who knows how to bring clarity to complexity and compose product messaging that not only informs but inspires. In this role, you'll shape and drive a unified approach that cuts across product silos and regional teams, ensuring every word ...
        We are seeking an experienced Product Engagement specialist to join the Analytics Client Engagement team in London, where you'll drive the narrative strategy behind some of LSEGs most impactful financial analytics products and experiences. As part of our high-performing client insight and engagement team, you will take a lead role to craft and scale brilliant narratives and digital experiences across the Analytics product portfolio for our growing client base and digital experiences. We're looking for a strategic storyteller to lead narrative research and development across our Analytics product and proposition portfolio, someone who knows how to bring clarity to complexity and compose product messaging that not only informs but inspires. In this role, you'll shape and drive a unified approach that cuts across product silos and regional teams, ensuring every word ...
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        As part of our high-performing Client Insight & Engagement team, youll help us research, define and craft outstanding digital experiences across our growing Analytics product portfolio. Focused on customer desirability you'll be at the forefront of crafting innovative, seamless, and human-centred products that make a real difference for our clients, at scale. Were looking for an experienced Product Research lead to inform and evolve sophisticated product concepts into user-first experiences across multiple industry digital touchpoints and channels. You'll weave design and systems thinking, empathy, and innovation to every stage of the product process, ensuring our products not only meet user needs but exceed expectations. This is more than a research role; its a chance to help define the future of how our clients engage with and experience high value financial solutio
        As part of our high-performing Client Insight & Engagement team, youll help us research, define and craft outstanding digital experiences across our growing Analytics product portfolio. Focused on customer desirability you'll be at the forefront of crafting innovative, seamless, and human-centred products that make a real difference for our clients, at scale. Were looking for an experienced Product Research lead to inform and evolve sophisticated product concepts into user-first experiences across multiple industry digital touchpoints and channels. You'll weave design and systems thinking, empathy, and innovation to every stage of the product process, ensuring our products not only meet user needs but exceed expectations. This is more than a research role; its a chance to help define the future of how our clients engage with and experience high value financial solutio
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        Location: London - 1x a month - Salary: Up to £120,000 (D.O.E) + benefits - Fruition Group are partnering with a high-growth Insurtech unicorn that's scaling its engineering function. This is a unique chance to work across both proven, revenue-generating products and greenfield initiatives that are reshaping the future of insurance. It's an ideal role for a driven Lead Engineer who thrives in ambitious environments and wants to make a tangible impact. As a Lead Backend Engineer, you'll take ownership of designing and scaling cloud-native backend systems. You'll work primarily with Python (FastAPI) and play a key role in shaping the architecture of microservices that support millions of users. Beyond hands-on development, you'll provide technical leadership, mentor team members, and influence strategic engineering decisions.
        Location: London - 1x a month - Salary: Up to £120,000 (D.O.E) + benefits - Fruition Group are partnering with a high-growth Insurtech unicorn that's scaling its engineering function. This is a unique chance to work across both proven, revenue-generating products and greenfield initiatives that are reshaping the future of insurance. It's an ideal role for a driven Lead Engineer who thrives in ambitious environments and wants to make a tangible impact. As a Lead Backend Engineer, you'll take ownership of designing and scaling cloud-native backend systems. You'll work primarily with Python (FastAPI) and play a key role in shaping the architecture of microservices that support millions of users. Beyond hands-on development, you'll provide technical leadership, mentor team members, and influence strategic engineering decisions.
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        Experience in using API testing tools like Postman, Insomnia
        Experience in using API testing tools like Postman, Insomnia
        NEWFEATURED
        Experience with some of the technologies we make use of: Groovy, Python, AWS Serverless (API Gateway, Lambdas), XML, JSON, Open API, virtualisation in general and especially Docker and its eco system, Git, NoSQL products and concepts (Dynamo, column family, etc.)
        Experience with some of the technologies we make use of: Groovy, Python, AWS Serverless (API Gateway, Lambdas), XML, JSON, Open API, virtualisation in general and especially Docker and its eco system, Git, NoSQL products and concepts (Dynamo, column family, etc.)
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        NEW
        4+ years automation testing skills (Selenium, Katalon, GT-UI, GT-API). * Web services testing / API testing skills is a plus.
        4+ years automation testing skills (Selenium, Katalon, GT-UI, GT-API). * Web services testing / API testing skills is a plus.
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        NEW
        We are seeking an AI Engineer with experience in Large Language API's (from 2021), Generative AI and Python, to play a pivotal role in shaping and enhancing AI products for Government. - Maintain and iterate a web API using FastAPI, hosted on Amazon Web Services (AWS).
        We are seeking an AI Engineer with experience in Large Language API's (from 2021), Generative AI and Python, to play a pivotal role in shaping and enhancing AI products for Government. - Maintain and iterate a web API using FastAPI, hosted on Amazon Web Services (AWS).
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        NEW

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        Frequently Asked Questions

        How many API jobs are there in Watford?
        There are 78 API jobs within 20 miles of Watford available on CWJobs right now.

        What other similar jobs are there to API jobs in Watford?
        As well as API jobs in Watford, you can find DevOps, Implementation, IT, amongst many others.