22 senior api developer jobs found

Company Description For over 28 years, Version 1 has partnered with leading global brands to deliver digital, cloud, and enterprise application solutions that drive business success. We are proud to be recognised as: Oracle Innovation Partner of the Year 2023 (EMEA) Microsoft Global Partner of the Year (Modernising Applications) AWS Collaboration Partner of the Year (EMEA) One of the Best Workplaces for Women in the UK & Ireland (2023) With 3,700+ people and revenues exceeding €347m/£302m , Version 1 is a market leader in Oracle, Microsoft, and AWS consulting services – and one of the fastest-growing digital consultancies in Europe. Job Description Senior Oracle Fusion Technical Consultant (Cloud Extension Focussed) (Outside IR35 Contract) You must be eligible for CTC Clearance. To be eligible for CTC clearance you need to have lived in the UK for the last 3 years. You must be immediately available or on a very short notice period. Build....

Company Description For over 28 years, Version 1 has partnered with leading global brands to deliver digital, cloud, and enterprise application solutions that drive business success. We are proud to be recognised as: Oracle Innovation Partner of the Year 2023 (EMEA) Microsoft Global Partner of the Year (Modernising Applications) AWS Collaboration Partner of the Year (EMEA) One of the Best Workplaces for Women in the UK & Ireland (2023) With 3,700+ people and revenues exceeding €347m/£302m , Version 1 is a market leader in Oracle, Microsoft, and AWS consulting services – and one of the fastest-growing digital consultancies in Europe. Job Description Senior Oracle Fusion Technical Consultant (Cloud Extension Focussed) (Outside IR35 Contract) You must be eligible for CTC Clearance. To be eligible for CTC clearance you need to have lived in the UK for the last 3 years. You must be immediately available or on a very short notice period. Build....

Company Description For over 28 years, Version 1 has partnered with leading global brands to deliver digital, cloud, and enterprise application solutions that drive business success. We are proud to be recognised as: Oracle Innovation Partner of the Year 2023 (EMEA) Microsoft Global Partner of the Year (Modernising Applications) AWS Collaboration Partner of the Year (EMEA) One of the Best Workplaces for Women in the UK & Ireland (2023) With 3,700+ people and revenues exceeding €347m/£302m , Version 1 is a market leader in Oracle, Microsoft, and AWS consulting services – and one of the fastest-growing digital consultancies in Europe. Job Description Senior Oracle Fusion Technical Consultant (Cloud Extension Focussed) (Outside IR35 Contract) You must be eligible for CTC Clearance. To be eligible for CTC clearance you need to have lived in the UK for the last 3 years. You must be immediately available or on a very short notice period. Build....

Company Description For over 28 years, Version 1 has partnered with leading global brands to deliver digital, cloud, and enterprise application solutions that drive business success. We are proud to be recognised as: Oracle Innovation Partner of the Year 2023 (EMEA) Microsoft Global Partner of the Year (Modernising Applications) AWS Collaboration Partner of the Year (EMEA) One of the Best Workplaces for Women in the UK & Ireland (2023) With 3,700+ people and revenues exceeding €347m/£302m , Version 1 is a market leader in Oracle, Microsoft, and AWS consulting services – and one of the fastest-growing digital consultancies in Europe. Job Description Senior Oracle Fusion Technical Consultant (Cloud Extension Focussed) (Outside IR35 Contract) You must be eligible for CTC Clearance. To be eligible for CTC clearance you need to have lived in the UK for the last 3 years. You must be immediately available or on a very short notice period. Build....

Company Description For over 28 years, Version 1 has partnered with leading global brands to deliver digital, cloud, and enterprise application solutions that drive business success. We are proud to be recognised as: Oracle Innovation Partner of the Year 2023 (EMEA) Microsoft Global Partner of the Year (Modernising Applications) AWS Collaboration Partner of the Year (EMEA) One of the Best Workplaces for Women in the UK & Ireland (2023) With 3,700+ people and revenues exceeding €347m/£302m , Version 1 is a market leader in Oracle, Microsoft, and AWS consulting services – and one of the fastest-growing digital consultancies in Europe. Job Description Senior Oracle Fusion Technical Consultant (Cloud Extension Focussed) (Outside IR35 Contract) You must be eligible for CTC Clearance. To be eligible for CTC clearance you need to have lived in the UK for the last 3 years. You must be immediately available or on a very short notice period. Build....

Senior Software Engineer - Golang - Go - Product - TDD – paying up to £550 (Outside IR35) – Hybrid – 3 months We’re a mission-driven tech company that builds products to help people make confident decisions about their finances and everyday services. They are looking for a strong Go Developer who is excited about working with new technologies. Essential Skills: Strong commercial experience with Golang Must have a Product first mentality Experience with observability would be great Experience configuring, deploying, and monitoring applications on AWS. TDD (Test-Driven Development) experience. API build experience is essential, especially with 3rd party API's Comfortable working with relational and NoSQL databases, including complex queries and performance optimization. Solid understanding of web design patterns, including SOLID principles. Experience working in an agile, collaborative environment. Familiarity with automated testing and CI/CD pipelines....

Senior WordPress Developer needed for our FMCG client in Glasgow for an initial 6-Week contract . The right candidate must have extensive demonstrable experience in WordPress & PHP with deep knowledge of the WordPress core engine , strong API integration expertise , and a proven ability to deliver secure, scalable, and high-performance solutions. This role is Outside IR35 and the majority of the time can be worked remotely , though there is a requirement for an initial two days onsite in Glasgow for workshops. Responsibilities will include developing, maintaining & optimising custom themes, plugins & features using modern, scalable, secure WordPress practices and designing & implementing integrations between WordPress and external systems using REST APIs, webhooks, SDKs, and Middleware. The right candidate must be a self-starter who can independently run WordPress audits, optimise performance and work closely with business stakeholders to prioritise...

Azure Engineer / Architect 6 month contract London - Hybrid £500 - £650 DOE - Outside IR35 We have multiple opportunities available for Azure Engineers / Architects to join a UK based consultancy who are delivering large digital transformation initiatives across multi-cloud environments. This is a 6 month engagement with potential for further extension. Azure API Platform Engineer Senior platform engineer to lead a multi-cloud API ecosystem, designing secure, scalable microservices and modernising legacy integrations. Also responsible for standardising architecture, improving observability, and driving best practices across teams. Must have: Strong experience with API gateway technologies Deep understanding of Kubernetes in Azure environments Integration between cloud native and legacy systems Azure Cloud Platform & SRE Engineer / Architect Senior engineer to evolve Azure cloud foundations, ensuring secure,...

Outside IR35 - pay rates Mid level - £380 Senior - £480 Location:  UK, within 30 miles of one of our offices (remote, hybrid, or onsite) Office locations:  Edinburgh, Newcastle, Leeds, Manchester, London The role  You’ll join a major UK-based investment platform, embedding directly into a long-term mobile app programme. You’ll work on a high-traffic product used by thousands of customers, focused on performance, reliability, and user experience at scale. You’ll contribute to Flutter delivery within the project, building features, improving app quality, and helping shape scalable solutions in production. You’ll work closely with engineers, product, and QA in a cross-functional client team, delivering features end-to-end with a strong focus on quality. What You’ll Do Build and maintain production-grade Flutter applications Deliver features end-to-end, from implementation through to release Contribute to testing across unit, widget, integration, and E2E...

My client is going through a big digital transformation and they're building a brand new portal that will bring multiple services into one simple, easy to use platform. They're now looking for a strong Front End developer to come in and help design and build the portal from the ground up. This is a proper hands on role where you'll be shaping how thousands of residents interact with council services going forward. This isn't a small change project either. You'll be working on something that will genuinely improve accessibility, performance and user experience across a wide range of public services. What you'll be doing You'll be working closely with the web and technical teams to build a modern citizen facing portal and integrate it with Back End systems. Day to day that will include Building clean, scalable Front End code using React Turning Figma designs and wireframes into accessible, production ready interfaces Integrating with REST or GraphQL APIs Improving...

Senior AI Engineer | £600/day Outside IR35 | 6-Month Contract Industry: Technology / Capital Markets Location: London - 3 days in office Job Type: Contract Our client, a forward-thinking technology organisation, is seeking a Senior AI Engineer to join a team building production-grade AI systems powered by large language models (LLMs). You will work closely with software engineers and product stakeholders to design, develop, and deploy scalable AI applications, focusing on multi-agent orchestration, intelligent tool integration, and reliable production workflows. Responsibilities Design and implement LLM-powered AI systems, including RAG pipelines, vector/knowledge databases, and agentic frameworks. Build and maintain production-grade AI applications with clean code, APIs, data pipelines, and robust error handling. Develop and maintain evaluation frameworks to measure and monitor system performance, accuracy, and reliability. Implement feedback loops...

Contract Java Developer – Data Up to £700 per day Outside IR35 (6 month rolling) In office – City of London Quant Capital is hiring for a small, high-performing market maker in London. This is a junior-to-mid role focused primarily on Java development, with a secondary responsibility owning straightforward Python ETL/data ingestion into AWS and PostgreSQL. This is a growing team focused on data ingestion and building tooling for the wider firm. What you’ll do: Build and enhance Java backend services (APIs, batch jobs, integrations) used across the business Write clean, testable code with solid engineering discipline (testing, code review, debugging, production support) Maintain and extend Python-based ingestion/ETL (pragmatic plumbing, not heavy data engineering) Work with PostgreSQL (schemas, migrations, performant queries, data validation) Improve service reliability: monitoring/logging, sensible alerting, and predictable deployments via CI/CD Tech:...

Job Title- AI Product Developer (AI Foundry) Client-Global Consulting Firm Day Rate-£350-£400 (Outside IR35) Duration-6 months (extendable) Location-Leeds (Hybrid, 3 days per week in the office) Essential skills and experience: Design, develop and maintain Copilot solutions, intelligent agents, plugins, connectors and LLM workflows (e.g., Copilot Studio). Build scalable components (prompt orchestration, retrieval layers, automation flows, model interfaces, validation pipelines). Integrate with enterprise systems/APIs/data platforms, ensuring security, resilience and architecture alignment. Conduct rapid prototyping to validate feasibility, model behaviour, UX and performance. Implement secure‑by‑design and responsible AI practices (guardrails, controls, monitoring, auditability). Develop/optimise RAG components, embeddings, vector queries and metadata strategies for accuracy/reliability. Implement observability: logging, telemetry and LLM monitoring for...

UI Developer (React) – Contract (Outside IR35) £450/day 3-month initial Hybrid (West Midlands) North Scout are recruiting a UI Developer for a large UK insurance organisation, working on a major internal digital platform used across multiple business units. This is a UI-led Front-End role focused on building robust, scalable user interfaces for complex, high-volume systems. It’s not a greenfield toy app – it’s proper enterprise engineering. You’ll be joining a small, senior product team and will have real ownership over front-end standards, component design, and UI quality across the platform. The Role This is a hands-on UI Developer position, working in a close-knit delivery team, while collaborating with multiple engineering, data, and product teams across the organisation. You’ll be responsible for building reusable UI components, improving front-end architecture, and ensuring the platform remains maintainable as it scales. This suits someone who’s...

Gigged.AI is an open talent marketplace specialising in the IT and technology sector. We have an opportunity live at the moment looking for a AI Engineer / AI Developer - Outside IR35 - UK based All proposals will be reviewed on the Gigged AI platform. In order to send a proposal please head to www.gigged.ai and create a free talent profile. Once signed in, follow this link (https://app.gigged.ai/find-a-gig/Jry0K8aDdYa) where you will see a ‘submit proposal’ button. Please ensure your CV is attached to the proposal. Project: AI-Driven Fleet Management Pilot Start: April 2026 Duration: 6 months IR35: Outside, pending final determination Rate: £600~ per day, flexibility depending on experience Mainly Remote - Occasional travel to either Glasgow or London office would be advantageous. Overview We are working towards our net-zero emissions target by 2030, transitioning our global fleet to more sustainable technologies...

About the Company A fintech company based in London is looking for a Senior Python Developer on an initial 3-month contract, with potential to extend. About the Role This is a sole-contributor role; you'll be the only developer on the project, so the ability to move fast and make good independent decisions is essential. The client is open to fully remote working, with monthly visits to the Hammersmith office when required. Responsibilities Building and delivering a Python based project end-to-end, working independently with minimal oversight. Integrating with exchange APIs and external data sources. Leveraging AI tooling, specifically Claude Code, to accelerate delivery and maintain quality as a team of one. Qualifications Must-haves Python 3.10+ with strong professional experience. Proven ability to work independently and deliver at pace, this is a sole-contributor engagement. Experience integrating with exchange or trading APIs....

React Developer Remote with very occasional client visits £400pd to £420pd - Outside IR35 3 - 6 month contract Our client, an established and successful Consultancy are looking for a number of mid-level Developers to join them on a contract basis With head offices in the north of the UK and branches spreading across the globe, they're a dynamic technology consultancy leader with a dedicated team of professionals, partnering with sector leaders After recently winning a large public sector project they are creating a whole new team and need people who are able to start no later than March 16th. This is a fully hands on role where you will work as part of an established successful team, primarily working with React and Typescript technologies We are looking for: Expert knowledge of React Strong proficiency in JavaScript (ES6+), HTML5, CSS3, and responsive UI engineering. Experience with Redux or other state management libraries. Strong understanding of front-end...

React Developer Remote with very occasional client visits £400pd to £420pd - Outside IR35 3 - 6 month contract Our client, an established and successful Consultancy are looking for a number of mid-level Developers to join them on a contract basis With head offices in the north of the UK and branches spreading across the globe, they're a dynamic technology consultancy leader with a dedicated team of professionals, partnering with sector leaders After recently winning a large public sector project they are creating a whole new team and need people who are able to start no later than March 16th. This is a fully hands on role where you will work as part of an established successful team, primarily working with React and Typescript technologies We are looking for: Expert knowledge of React Strong proficiency in JavaScript (ES6+), HTML5, CSS3, and responsive UI engineering. Experience with Redux or other state management libraries. Strong understanding of Front End...

IT Applications Manager - Central London £650 - £700 p/d (outside IR35) - 3 month initial term Well-established and highly profitable construction engineering business is seeking an experienced IT Applications Manager to join them on a permanent basis. This is a critical leadership role within an organisation undergoing significant digital transformation, with ambitious growth and acquisition plans driving demand for scalable, standardised and efficient business applications. Reporting into the Head of IT, you will lead the delivery, governance and optimisation of business applications across the enterprise. This role blends strategic oversight, hands-on expertise with modern low-code/no-code platforms and direct leadership of a multidisciplinary applications team. The IT Applications Manager will oversee a suite of core enterprise systems, including but not limited to: Workday, UKG (Kronos), COINS, SharePoint, Snowflake, Autodesk Construction Cloud, Pro-Sapien, Primavera P6...

Lead Java Engineer (Quarkus) Duration: Initial 3 months (with potential extension - project dependent) Location: Remote/London (Hybrid) Onsite requirements: Hybrid - primarily remote with on-site attendance in London for key meetings Engagement Type: Outside IR35 Day Rate: Competitive day rate Right to Work: Candidates must have the legal right to work in the UK. Sponsorship is not available for this position. BPSS screening will be required due to the regulated financial services environment. About Atrium Global Atrium Global is supporting a client of ours within the Banking industry who are delivering a large-scale data platform modernisation programme. Job Overview We are looking for an experienced Lead Java Engineer to join a high-profile engineering programme focused on modernising enterprise data platforms and batch processing capabilities. The role will focus on building and optimising cloud-native Java microservices using Quarkus while integrating with IBM Tivoli...