Senior Backend Engineer (0.5% Equity)

JR United Kingdom; Kingston upon Hull; Remote; GBP 40,000 - 70,000; Part time

Job summary

A leading start-up seeks a Senior Backend Engineer in Kingston upon Hull for a part-time, equity-only position. You will manage server-side code and develop mobile applications, with the role transitioning to full-time post-launch. Ideal candidates will have strong experience in C#/.NET and a passion for impactful projects.

Benefits

0.5% equity in the founding team

Qualifications

• Minimum 4 years developing web/mobile applications.
• 4-5 years using C# / .NET Core in a professional capacity.
• Experience with cloud native technologies such as Kubernetes.

Responsibilities

• Build REST Services using C# and .NET Core.
• Maintaining the optimal performance of our central database.
• Collaborating with front-end developers on element integration.

Skills

C#

.NET

Python

Java

REST

GraphQL

Problem-solving

Education

BSc or MSc in Computer Science, Engineering, or related field

Job description

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Senior Backend Engineer (0.5% Equity), kingston upon hull, east yorkshire

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Client:

Location:

kingston upon hull, east yorkshire, United Kingdom

Job Category:

Other

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EU work permit required:

Yes

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Job Views:

6

Posted:

16.06.2025

Expiry Date:

31.07.2025

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Job Description:

Senior Backend Engineer (Equity only)

As a Senior/Lead Backend Engineer, your responsibility will be to manage the server-side code and APIs of our mobile applications. You'll be involved in the entire product development lifecycle, from design to deployment and maintenance of new and existing features. The quality and stability of our mobile applications will depend heavily on your work, as you'll be writing reusable and maintainable code and performing UI tests to optimise performance. You'll also work closely with our front-end development team to ensure system consistency and a great user experience. Ultimately, you'll be the driving force behind all back-end activities. We understand your time is valuable, which is why we only require a few hours a day for the duration of the project, and the role is entirely remote. In exchange for your expertise and commitment, you'll receive vested equity in the start-up, along with a range of vested benefits. The app will launch in 2024, and this part-time equity-only role will transition into a paid full-time role after the launch.

Responsibilities

● Build REST Services using C# and .NET Core.

● Maintaining and developing server-side network components.

● Maintaining the optimal performance of our central database and ensuring responsiveness to any front-end requests.

● Collaborating with front-end application developers on element integration.

● Writing efficient, reusable, and testable code used in high-performance applications.

● Work as part of a cross-functional team to determine optimal API contracts, code reviews, internal infrastructure, and process enhancement.

● Full-stack development capabilities are a plus.

Requirements

● Strong experience with programming languages like C# / .NET, Python or Java.

● Experience building services using REST or GraphQL.

● Good understanding of the entire product development lifecycle.

● Minimum 4 years developing web/mobile applications

● Minimum 4 years’ experience working with relational and document databases.

● 4-5 years using C# / .Net Core in a professional capacity.

● Experience with cloud native technologies such as Kubernetes, containerisation, microservices and Software-defined Infrastructure.

● Great problem-solving skills and a team player.

● BSc or MSc in Computer Science, Engineering, or related field.

● Excellent analytical skills and good at time management.

Compensation

This is a pre-seed, equity-only role, offering 0.5% equity as part of the founding team. There is currently no salary available until we secure Seed funding, at which point competitive compensation will be introduced. This role is ideal for someone seeking long-term ownership and impact in a purpose-driven, early-stage venture