Senior Software Engineer (C# / .Net)
At LineTen · London; London, United Kingdom
- Engineering
- Senior
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Open to the United Kingdom
“London”
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- Posted
- 3 September 2026
- First seen by us
- 15 October 2026
- Last checked
- 5 hours ago
Job description
From LineTen’s job post, as they wrote it.
What we do
LineTen is on a mission to crack the code on urban delivery. By leading with our values and putting carrier partners first, we are paving the way for better delivery experiences. LineTen is a new approach to delivery with a free carrier API and an operations management platform for shippers. We're building the first global data-driven last-mile network that has the potential to solve industry-wide problems.
Read the full description
We’re hiring a Senior Software Engineer who treats software as a craft, not a checklist. You’ll join a small, high-trust team where ownership is expected, curiosity is encouraged, and outcomes matter more than activity. This is not a ticket-factory role: you’ll be expected to think critically, challenge assumptions, design robust solutions, and take responsibility for their long-term success.
You’ll work across backend services, distributed systems and frontend integrations, with a strong focus on correctness, maintainability and architectural clarity. You’ll also use AI-assisted development tools responsibly, understanding that speed only matters when paired with strong design, testing and review discipline.
How you’ll work
* Operate with high ownership in a low-process environment
* Proactively look for what can be improved rather than waiting for direction
* Value correctness, clarity and maintainability over “it just works”
* Work outside strict role boundaries when needed, without feeding burnout culture
* Communicate technical decisions clearly and push back constructively when required
Core technical skills
* C# / .NET 8+, Entity Framework Core, async/await, MediatR / CQRS
* Strong understanding of distributed systems: consistency models, event-driven patterns, idempotency, race conditions
* Experience with Redis caching, Azure Blob Storage, and data-modelling trade-offs
* API design: RESTful contracts, versioning, webhooks, long-running operations (202 Accepted patterns)
* Real-time & frontend integration: SignalR / WebSockets, SPA frameworks (Vue / Nuxt or similar), TypeScript
What good looks like
* You leave systems clearer, more correct, and easier to evolve
* Problems are solved at the right level, not patched over
* Trade-offs are explicit and understood
* Other engineers trust your judgement and the quality of your code
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