Senior Software Engineer (C# / .Net)

Vuejobs; Greater London; Hybrid; GBP 85,000 - 110,000; Full time

Job summary

LineTen is hiring a Senior Software Engineer. You’ll join a small, high-trust team where ownership is expected and outcomes matter. You’ll work across backend services, distributed systems and frontend integrations, with a strong focus on correctness, maintainability, and architectural clarity.

You’ll apply AI-assisted tooling responsibly to ensure robust design. You’ll collaborate across backend and frontend boundaries, delivering scalable, data-driven solutions while maintaining a high

Qualifications

• Proficient with C# / .NET 8+ and async/await patterns.
• Experience building distributed systems with event-driven designs.
• Strong API design skills: REST, versioning, webhooks.
• Real-time frontend integration with SignalR or WebSockets; Vue/Nuxt or similar.
• TypeScript experience for frontend integrations.
• Ability to work in a low-process environment with ownership.

Responsibilities

• Develop backend services and frontend integrations with a focus on correctness and maintainability.
• Design robust, long-term solutions and own components end-to-end.
• Collaborate across services to optimize distributed architectures.
• Contribute to architectural decisions and maintain clear documentation.

Skills

C# / .NET 8+

Entity Framework Core

Async/await

MediatR / CQRS

Distributed systems

Redis caching

Azure Blob Storage

API design

SignalR / WebSockets

Vue/Nuxt integration

TypeScript

Tools

MediatR / CQRS

RESTful APIs

Job description

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.

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 understoodOther engineers trust your judgement and the quality of your code