Senior C# Engineer

Haystack; United Kingdom; Remote; GBP 160,000 - 180,000; Full time

Job summary

An innovative firm is seeking a Senior C# Developer to join their mission-driven team focused on sustainable technology. This remote-first role offers the chance to shape a new platform aimed at tackling significant global challenges. You'll collaborate with a supportive team, contributing to architecture and best practices while building scalable systems. If you're passionate about clean code and impactful technology, this opportunity is perfect for you.

Qualifications

• Strong experience with back-end development in C#.
• Solid understanding of building APIs and service-based architectures.

Responsibilities

• Build and maintain performant, scalable, and maintainable services.
• Design and implement REST APIs.

Skills

C#

API Development

Service-based Architectures

Clean Code Practices

Collaboration

Tools

PostgreSQL

AWS

Job description

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Senior C# Developer

Remote-first | Optional office space in London

About the Role

We're looking for a Senior C# Developer to join a small, collaborative, and mission-driven team building a new platform in the sustainable supply chain space. This is an exciting opportunity to get involved at the ground level of a greenfield project that’s aiming to make a real-world impact — tackling challenges like deforestation and illicit trade through innovative technology.

As part of a distributed team across Europe, you’ll play a key role in designing and developing a scalable, secure system from the ground up. You won’t just be handed tickets — you’ll have the autonomy to help shape the product and the way we build it.

What you’ll do

• Build and maintain performant, scalable, and maintainable services
• Design and implement REST APIs
• Contribute to architecture, tooling, and best practices
• Collaborate closely with a small, supportive team that values curiosity, kindness, and ownership

What we’re looking for

Strong experience with back-end development in C#

A solid understanding of building APIs and service-based architectures

A passion for clean, maintainable, and efficient code

A collaborative mindset and willingness to get involved in product discussions

Nice to have

Experience with PostgreSQL or similar relational databases

Exposure to DevOps practices and AWS or other cloud platforms

Seniority level

• Seniority level

  Mid-Senior level

Employment type

• Employment type

  Full-time

Job function

• Industries

  Technology, Information and Internet

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