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2 senior backend developer jobs found

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Hourly/Freelance senior backend developer Remote
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Contract Spy
Jan 30, 2026
Hourly/Freelance
Principal Full-Stack Engineer, Contract at Xcelirate, Remote, £Hourly Rate
Contract Spy Remote (London, England, United Kingdom)
Who Are We? Xcelirate develops technologically-advanced platforms which are accessed by thousands of users every minute! We are proud to offer a workplace where the sharpest developers come together to strategically plan and swiftly execute practices which see us maintain our existing market dominance and attain global expansion. We owe our success to our customers who have seen us grow across a decade, and our talented team who have made that growth possible! What are we looking for? You're a principal-level full-stack engineer. You haven't just been around the block - you helped decide which blocks were worth building, and which ones should've been bulldozed early. At this point, programming languages don't really impress you anymore. You treat them as tools that translate intent into something a compiler or interpreter can run, choosing them pragmatically, discarding them without nostalgia, and never confusing syntax or novelty with actual progress. You've been around...
Contract Spy
Feb 13, 2026
Hourly/Freelance
Blockchain Backend Engineer (Rust/Polyglot) at Out of the Box Systems, Remote, £Freelance Rate
Contract Spy Remote
We are looking for a true Polyglot Engineer to join our team for a long-term collaboration. In the fragmented world of Web3, the ability to bridge different technologies is a superpower. We need a specialist who can architect and build the critical off-chain infrastructure that powers decentralized applications. If you are proficient in Rust but comfortable diving into C++, Python, and Node.js to get the job done, this role is for you. Who are we? We are Out Of The Box Systems: a Ukrainian team of passionate, battle-tested engineers and creators united by one goal—delivering real results with clarity, precision, and autonomy. We champion a flexible, pragmatic approach over rigid, static processes. While our roots and primary team are in Ukraine, we collaborate with top talent from various labor markets. We specialize in demanding fields like Rust-first development, AI Engineering, and Computer Graphics, blending performance, security, and innovation into every...
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