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2 backend software developer jobs found in London

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London backend software developer
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£500 - £600  (1)
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Greater London  (2)
Outside Spy
Jun 02, 2026
Duration not stated
Lead Back-End Software Developer at Harnham - Data & Analytics Recruitment, London, £Contract Rate
Outside Spy London, UK
Lead Backend Software Developer (Contract) London, Outside IR35 £500-£600 per day This is an exciting opportunity to join a fast-moving engineering function at a pivotal moment of technical uplift. They are investing heavily in strengthening their core platforms and commercial data systems, creating a strong mandate for senior engineers to step in, lead, and make an immediate impact. The Company They are a growing digital gaming organisation operating across multiple markets, currently modernising their Back End ecosystem. With distributed teams across the UK and Europe, they are building scalable platforms that support a variety of customer-facing and internal products. Engineering quality, strong technical leadership, and delivery excellence are central to their transformation. Contractors join at a time when technical ownership is expanding in-house, creating real scope to shape systems and standards. The Role and Deliverables: Lead Back End development across a complex...
Outside Spy
Apr 07, 2026
Duration not stated
Java Software Engineer at Tiro Partners, Charing Cross, £575 per Day
£575 per day
Outside Spy Charing Cross, Strand, London WC2N 5HF, UK
Java / Microservices / API design / LLMs / AI / Claude Code / Copilot Company:  Financial Services Location:  London - Hybrid 3 days per week Rate:  £575 IR35:  Outside CORE BANKING AND TRADING SYSTEMS EXPERIENCE ESSENTIAL Join a newly formed Service Modernisation & AI team driving AI-first software development in financial services. This is a hands-on role modernising high-impact legacy services while building AI-powered engineering workflows. What You’ll Do Modernise critical legacy Java services using AI-driven analysis and refactoring Apply migration patterns (e.g. strangler fig) to deliver clean, modern APIs Ship improvements in fast cycles with measurable gains in performance and reliability Build AI-powered tooling, including MCP servers and AI-assisted CI/CD pipelines Demonstrate how AI transforms developer productivity and code quality What We’re Looking For 6+ years’ backend engineering experience (Java)...
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