Senior Software Engineer; C# /.Net
Listed on 2026-09-27
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Software Development
Backend Developer, Software Engineer
Location: Greater London
What we do
Line Ten 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. Line Ten 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.
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
- 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 / Web Sockets, SPA frameworks (Vue / Nuxt or similar), Type Script
- 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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