12 senior backend engineer jobs found

OVERVIEW Senior Agentic AI Engineer / AI Architect - multi-agent AI systems London (4 Days Onsite) 6 month Contract (Inside IR35)   UST is seeking a Senior Agentic AI Engineer / Architect to design, build, and deploy enterprise-scale AI solutions powered by LLMs, Agentic AI, and Multi-Agent Systems. This is a hands-on role for someone who has moved beyond PoCs and has successfully delivered production-grade AI applications at scale. You'll work closely with architects, engineers, and business stakeholders to solve complex challenges using the latest AI technologies.   What You'll Do Design and develop multi-agent AI systems using modern orchestration frameworks. Build intelligent workflows leveraging agent planning, reasoning, memory, tool usage, and task delegation. Deliver production-ready solutions using LLMs, RAG, and AI-powered automation. Develop secure, scalable Python services, APIs, and orchestration layers....

Role description Senior Agentic AI Engineer / AI Architect - multi-agent AI systems London (4 Days Onsite) 6 month Contract (Inside IR35)     UST is seeking a Senior Agentic AI Engineer / Architect to design, build, and deploy enterprise-scale AI solutions powered by LLMs, Agentic AI, and Multi-Agent Systems. This is a hands-on role for someone who has moved beyond PoCs and has successfully delivered production-grade AI applications at scale. You'll work closely with architects, engineers, and business stakeholders to solve complex challenges using the latest AI technologies.     What You'll Do Design and develop multi-agent AI systems using modern orchestration frameworks. Build intelligent workflows leveraging agent planning, reasoning, memory, tool usage, and task delegation. Deliver production-ready solutions using LLMs, RAG, and AI-powered automation. Develop secure, scalable Python services, APIs, and...

Joining a new project Ideally have worked on Financial Services Projects before (Payments would be great) Fullstack Experience Tech Stack - Kotlin Backend, JS/TS React Frontend Start date ASAP Duration 6 months (Likely to extend) 2/3 days / week in person working (London) Immediate Interviews   The best bit about Red Badger is, of course, the team. We are really proud of our people; we support and learn a lot from each other; we work really hard but have fun doing it. We are a diverse group made up of 22 different nationalities, speaking 17 different languages.   Our 3 founders, Dave, Cain and Stu, who have considerable tech and consultancy experience and still own 100% of the company. We've been consistently profitable and have grown responsibly from the beginning.   We are based at Old Street in the heart of "tech city" and get thoroughly stuck in with the brilliant community around us. We run...

Location: London 1-2 days a week. Department: Engineering Employment Type: Contract Contract Length: 6 months (with potential for extension) About YLD: Our goal is to help our clients keep moving forward. We work with them to build the skills and capabilities they need to stay ahead of the competition, and we know our success only happens when they succeed. We’re a team of curious, talented people, and we’re committed to making YLD a place where great people want to work, grow, and stay. We’re a remote-first consultancy specialising in software engineering, product design, and data. Our teams are based across London, Lisbon, and Porto, and we create digital solutions that continue to deliver value long after our work is done. About the role: As a Senior Software Engineer at YLD, you’ll be part of a client team building innovative products. We’re looking for someone curious, passionate, driven, and...

We are seeking a Backend Java Software Engineer to join our team on a contractual basis. This role heavily focuses on Java, Backend, iGaming Operator Integrations.   This is 1 year extendable contract and applicants must operate through a fully registered limited company to be considered for this role. The role is fully remote, with occasional travel required to our headquarters in Málaga, Spain   What You’ll Do Design, develop and maintain scalable, resilient backend services using Java (17+) and Spring Boot, with a strong focus on quality and a zero-defect mindset. Build and evolve integrations between our iGaming platform and operators, aggregators and other external partners. Design and implement robust REST APIs, asynchronous integrations and event-driven services supporting high-volume, real-time gaming transactions. Develop and maintain common platform capabilities supporting operator integration,...

Senior QA Engineer (Contract) – USA Tech Team     Contract Details Contract Length: Initial 12-month contract IR35 Status: Outside IR35 Location: Hybrid / Remote (UK)   This is an opportunity to join Nando's USA Technology team on a long-term contract, helping build and scale the digital products that support our expansion across the USA. You'll help ensure quality is built into every stage of delivery, working alongside engineers, Product Managers and Designers to deliver reliable, high-performing digital experiences within a collaborative, agile environment.     Overall Ambition Help deliver exceptional digital experiences for Nando's customers across the USA by embedding quality throughout every stage of software delivery. You'll join a fast-moving engineering team, ensuring quality is considered from discovery through to production by combining thoughtful test strategy, intelligent automation...

Location: London 1-2 days a week. Department: Engineering Employment Type: Contract Contract Length: 6 months (with potential for extension) About YLD: Our goal is to help our clients keep moving forward. We work with them to build the skills and capabilities they need to stay ahead of the competition, and we know our success only happens when they succeed. We’re a team of curious, talented people, and we’re committed to making YLD a place where great people want to work, grow, and stay. We’re a remote-first consultancy specialising in software engineering, product design, and data. Our teams are based across London, Lisbon, and Porto, and we create digital solutions that continue to deliver value long after our work is done. About the role: As a Senior Software Engineer at YLD, you’ll be part of a client team building innovative products. We’re looking for someone curious, passionate, driven, and...

Joining a new project Ideally have worked on Financial Services Projects before (Payments would be great) Fullstack Experience Tech Stack - Kotlin Backend, JS/TS React Frontend Start date ASAP Duration 6 months (Likely to extend) 2/3 days / week in person working (London) Immediate Interviews   The best bit about Red Badger is, of course, the team. We are really proud of our people; we support and learn a lot from each other; we work really hard but have fun doing it. We are a diverse group made up of 22 different nationalities, speaking 17 different languages.   Our 3 founders, Dave, Cain and Stu, who have considerable tech and consultancy experience and still own 100% of the company. We've been consistently profitable and have grown responsibly from the beginning.   We are based at Old Street in the heart of "tech city" and get thoroughly stuck in with the brilliant community around...

Location: London 1-2 days a week. Department: Engineering Employment Type: Contract Contract Length: 6 months (with potential for extension) About YLD: Our goal is to help our clients keep moving forward. We work with them to build the skills and capabilities they need to stay ahead of the competition, and we know our success only happens when they succeed. We’re a team of curious, talented people, and we’re committed to making YLD a place where great people want to work, grow, and stay. We’re a remote-first consultancy specialising in software engineering, product design, and data. Our teams are based across London, Lisbon, and Porto, and we create digital solutions that continue to deliver value long after our work is done. About the role: As a Senior Software Engineer at YLD, you’ll be part of a client team building innovative products. We’re looking for someone curious, passionate, driven, and...

Joining a new project Ideally have worked on Financial Services Projects before (Payments would be great) Fullstack Experience Tech Stack - Kotlin Backend, JS/TS React Frontend Start date ASAP Duration 6 months (Likely to extend) 2/3 days / week in person working (London) Immediate Interviews   The best bit about Red Badger is, of course, the team. We are really proud of our people; we support and learn a lot from each other; we work really hard but have fun doing it. We are a diverse group made up of 22 different nationalities, speaking 17 different languages.   Our 3 founders, Dave, Cain and Stu, who have considerable tech and consultancy experience and still own 100% of the company. We've been consistently profitable and have grown responsibly from the beginning.   We are based at Old Street in the heart of "tech city" and get thoroughly stuck in with the brilliant community around...

Senior AI Engineer Assignment type: 6 month contract (outside IR35) TMHCC is seeking a Senior AI Engineer to support the build-out of our AI Ops capability and delivery of strategic AI transformation initiatives across insurance operations, including Policy Revamp and FNOL (First Notice of Loss). The role will focus on designing and implementing enterprise-grade Agentic AI solutions using Azure AI Foundry, Python, Azure Functions, and modern cloud-native engineering practices. This is a hands-on engineering role requiring strong experience in AI workflow orchestration, secure Azure architecture, API integration, and scalable AI solution delivery.   Key Responsibilities Design and develop Agentic AI solutions using Azure AI Foundry and Azure OpenAI Build AI orchestration workflows using Python and Azure Durable Functions Develop document-processing and AI-driven automation solutions for insurance workflows Implement secure Azure...

Lead Java Developer/Solution Architect (6-month contract) Job description   gravity9 is recruiting Java engineers and architects for a portfolio of engagements across UK central government. These are large-scale, data-intensive modernisation programmes: replacing legacy systems that carry statutory weight, decomposing monoliths that serve millions of users, and building secure data platforms where access control and auditability are first-class architectural concerns rather than late additions. We are hiring across two overlapping profiles — Senior Java Developer and Application / Migration Architect — and expect most people to move between programmes as engagements start and complete. Several of these are hands-on architect roles: you will own design decisions and also write production code   The kind of work The following are representative of current and upcoming engagements. Individual roles will draw on some of this, not all of it...