9 senior api developer jobs found

Senior .NET / Full Stack Developer – Hybrid – £600/day Outside IR35 | C# | Azure | Event-Driven Systems | Payments | API-Driven We have a unique opportunity for a Senior .NET / Full Stack Developer to join a payments company. As a Senior .NET / Full Stack Developer , you’ll play a key role in building and scaling a high-throughput payments platform as the business enters its next phase of growth. This includes launching new products, enabling new partner integrations, and expanding a platform that already powers multiple live financial services products used globally. You’ll be building on top of a modern, cloud-native platform built with .NET and Azure , designed around API-first architecture and event-driven microservices . The platform supports complex payment flows, partner integrations, and high-volume transaction processing. This is a hands-on senior engineering role where you’ll contribute to architectural discussions, drive engineering best...

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...

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...

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....

D365 Business Central Functional Consultant / Solution Architect (eCommerce & Retail) Location: Manchester (Hybrid) Contract: Short Term Start: ASAP IR35: Outside Overview Client in the eCommerce & Retail sector requires a D365 Business Central Functional Consultant / Solution Architect to lead functional design and produce a full functional specification for upcoming changes and integrations. Key Responsibilities Lead functional discovery across eCommerce, Retail Ops, Finance, Warehousing Review current BC setup and identify gaps Own the Functional Design Document (FDD) Produce a full Functional Specification for development Document integrations (eCommerce platform, payment gateways, WMS/3PL, Power Platform) Map end to end processes: order-to-cash, stock, fulfilment, returns, finance posting Create user stories, acceptance criteria, process maps, test scenarios Work with stakeholders to validate requirements Support handover...

Java Developer - SC Cleared Location: London (1–2 days onsite per month) Contract: Outside IR35 Rate: £600–£675 per day Duration: 12 Month Contract Start: Immediate / Short Notice Preferred Eligibility: Active SC Clearance required (DV clearance ideally) Overview An experienced Java Developer is required to build and maintain scalable, high-performance applications within a secure public sector environment. Requirements Strong experience with Java & Springboot Solid Java back-end development experience Experience working in public sector Strong understanding of API integration and system design Active SC Clearance required (DV clearance ideally)

Java Developer - SC Cleared Location: London (1-2 days onsite per month) Contract: Outside IR35 Rate: £600-£675 per day Duration: 12 Month Contract Start: Immediate/Short Notice Preferred Eligibility: Active SC Clearance required (DV clearance ideally) Overview An experienced Java Developer is required to build and maintain scalable, high-performance applications within a secure public sector environment. Requirements Strong experience with Java & Springboot Solid Java Back End development experience Experience working in public sector Strong understanding of API integration and system design Active SC Clearance required (DV clearance ideally)

IFS Cloud Consultant £600 - £700 per day | Outside IR35 Initial 12-month contract Hybrid role - St Albans (site presence required) IFS Cloud Consultant - Outside IR35 - St Albans TalentBank Technology is supporting a leading organisation within the energy and utilities sector to engage an experienced IFS Cloud Consultant on an initial 12-month contract. This role combines technical leadership, hands-on delivery, and functional expertise across a globally distributed IFS Cloud platform. The successful consultant will work closely with IT leaders, developers, architects, and functional teams to drive platform standardisation, technical excellence, and governance across security, data management, release management, and environment management. Key Responsibilities Define and implement best practices for IFS Cloud security and permissions architecture. Lead release and deployment management including updates, patches, integrations, and configurations. Oversee...