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8 senior backend developer jobs found

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United Kingdom 6 Months or more senior backend developer
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£400 - £500  (2) £500 - £600  (1)
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Contract Spy
May 18, 2026
6 Months or more
Senior Backend .NET Engineer (AWS, Claude Code) at Reapit Ltd, Remote, 6 Months, £Excellent Day Rate (Outside IR35)
Contract Spy Remote (United Kingdom)
Outside IR35 contract - 6 months - excellent day rate - remote Reapit - Who are we? Reapit is the original end-to-end business technology provider for estate agencies of all sizes. We've been helping sales and lettings agents build relationships and grow their businesses for more than 25 years. Our technology empowers property professionals across Europe, the Middle East, Australia, and New Zealand to work with buyers, sellers, tenants, and landlords to deliver a dream home experience. Worldwide, over 100,000 agents across more than 15,000 branches use Reapit to run their businesses, manage properties, collect rent, engage clients, and provide outstanding customer service every time. What you'll be doing Reporting to the Director of Engineering, you'll operate as a highly senior, technically hands-on Back End engineer, Embedded into a squad and owning delivery of substantive, cloud-native services end-to-end. Ad-hoc client interaction, supporting...
Contract Spy
May 11, 2026
6 Months or more
Senior Software Engineer at Eurobase, Remote/Chelmsford, 6 Months, £500-£550 per day
£500 - £550 per day
Contract Spy Hybrid (Chelmsford, England, United Kingdom)
📍 Chelmsford (2x per month) 💰 £500 - £550 per day 📄 6 Month Contract   At Eurobase, we are continuing to evolve and modernise our core platform as part of an exciting transformation journey. With over 30 years of domain expertise, we are introducing a new API driven architecture alongside our existing Legacy system and are looking for a Senior Software Engineer to play a key role in that evolution.   We are seeking an experienced C# Backend Developer to help design and build a modern family of APIs over an existing SQL based Legacy platform, supporting our move towards a more modular, serviceoriented architecture.   You'll work closely with software engineers, testers, product specialists, and leadership stakeholders in a collaborative agile environment, contributing to both hands-on development and technical direction.   As a Senior Software Engineer, you will: Design, develop, and maintain scalable RESTful...
Contract Spy
Jun 01, 2026
6 Months or more
Back-End Developer (Java &Spring Boot/GCP) at Methods, London, 6 Months, £490 per day
£490 per day
Contract Spy London Area, United Kingdom
Methods is looking for a Back End Developer specialising in Java Spring Boot and GCP(Google Cloud Platform) to join our team within the private Sector Business unit. Rate: £490 inside IR35 Duration: 6 month initially Location: Hybrid; 3days/w in London office   Requirements:   Architectural Rebuild: Play a role in migrating and rebuilding our core architecture in Java Spring Boot to align with a composable, cloud-native landscape. Connector Development: Design and optimize technical connectors for a diverse mix of global channels, including generalist marketplaces, social commerce (eg, TikTok Shop), and quick-commerce (eg, Glovo, Deliveroo). Catalog Publication Flow: Refocus efforts on rebuilding the catalog publication flow, addressing technical complexities such as category mapping, product variant synchronization, and asynchronous marketplace APIs. Business Logic Migration: Collaborate on transferring complex Legacy...
Contract Spy
Jun 01, 2026
6 Months or more
Lead Developer at The Electoral Commission, Remote, £Contract Rate
Contract Spy Remote (United Kingdom)
The Role As Lead Developer, you'll take end-to-end ownership of a critical digital service, working across the full software development lifecycle from early-stage design and discovery through to delivery, scaling and ongoing live support. This is a hands on technical leadership role, with a genuine balance between engineering and collaboration. You'll remain close to the code while also working with product, data and stakeholders to shape the long-term direction of the service. You'll initially work closely with Democracy Club's developers, the third-party organisation which currently provides postcode specific election information. The initial stage involves working with existing code and evaluating how best to transition it in-house.   This role sits at the heart of one of the Commission's most significant digital initiatives - the transfer and development of a voter information service used by millions of citizens. You'll be responsible for delivering...
Contract Spy
May 28, 2026
6 Months or more
Lead Developer - SC Cleared at Ministry of Justice, Remote, 6 Months, £Contract Rate
Contract Spy Remote (London, UK)
SC Clearance is an essential requirement for this role, as a minimum you must be willing & eligible to undergo checks. Please note, due to the exceptional requirements of this position (short-term nature of this role and speed at which we require a postholder in situ) preference may be given to candidates who meet all of the essential criteria and hold active SC clearance.    The Ministry of Justice (MoJ) priorities include improving public safety and reducing reoffending by reforming prisons, probation and youth justice, and building a justice system which makes access to justice swifter and more certain for all citizens whatever their background. Project professionals in the MoJ help to improve the government's ability to protect the public and reduce reoffending, and to provide a more effective, transparent and responsive criminal justice system for victims and the public.   As a  Lead Developer , your main responsibilities will be:...
Contract Spy
May 22, 2026
6 Months or more
Senior Software Engineer at Bezos.AI, United Kingdom, 6 Months, £Contract Rate
Contract Spy UK
15 hours ago We are looking for a hands-on Senior Software Engineer to join our engineering team for a high-impact, 6-month project, with good chance of extensions and potential route to permanent if interested.   Reporting to the Head of Engineering, you will focus 100% on technical delivery, playing a pivotal role in designing, building, and delivering core components of our platform.   This is a fast-moving startup environment where you will write production-grade code and influence technical decisions to solve complex e-commerce logistics challenges.   Our Core Values We believe in direct and open communication. We encourage sharing opinions and debating ideas freely, without making it personal. As a fully remote company, we know clear and consistent communication is vital, and we make an extra effort to ensure we're understood not just by our immediate team, but by everyone. We are highly collaborative. Building a startup...
Contract Spy
May 20, 2026
6 Months or more
Senior Onboarding Software Engineering at Novatus, London Area, 6 Months, £Contract Rate
Contract Spy London Area, United Kingdom
Novatus is a Series B scale-up RegTech SaaS provider and boutique advisory practice, enabling financial services firms to solve complex challenges and redefine what’s possible through expert-led technology and consulting. Across both our technology and consulting services, Novatus delivers practical solutions to some of the most complex regulatory, data and operational challenges in financial services.   Our SaaS platform, En>ACT ( short for Ensuring Accurate, Complete and Timely reporting ), is a market-leading solution for regulatory transaction reporting and reconciliation, providing real-time, independent oversight of transaction reporting across all global regulatory regimes. En>ACT is the only real-time assurance solution that tests 100% of transactions and 100% of fields, replacing sample-based reviews and static PDF reports delivered months after the event with live, actionable insights. This helps firms remediate quickly, reduce risk, and meet...
Contract Spy
May 15, 2026
6 Months or more
Senior Software Engineer at Bezos.AI, United Kingdom, 6 Months, £Contract Rate
Contract Spy United Kingdom
We are looking for a hands-on Senior Software Engineer to join our engineering team for a high-impact, 6-month project, with good chance of extensions and potential route to permanent if interested.   Reporting to the Head of Engineering, you will focus 100% on technical delivery, playing a pivotal role in designing, building, and delivering core components of our platform.   This is a fast-moving startup environment where you will write production-grade code and influence technical decisions to solve complex e-commerce logistics challenges.   Our Core Values We believe in direct and open communication. We encourage sharing opinions and debating ideas freely, without making it personal. As a fully remote company, we know clear and consistent communication is vital, and we make an extra effort to ensure we're understood not just by our immediate team, but by everyone. We are highly collaborative. Building a startup requires a true...
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