Full Stack Engineer | C#, .NET, React

JR United Kingdom; Stevenage; On-site; GBP 80,000 - 100,000; Full time

Job summary

An exciting opportunity for a Full Stack Software Engineer to join an early-stage start-up in London. Join a dynamic team focused on modern technologies like C#, .NET, and React, and engage in all aspects of product strategy and development. With a collaborative culture and potential for significant equity, this role offers the chance to make a lasting impact.

Benefits

Equity in a promising start-up

Fast and respectful interview process

Qualifications

• 3+ years’ experience is typically expected.
• Strong across C#, .NET, React.
• Experience in FinTech or B2B SaaS is advantageous.

Responsibilities

• Actively involved in commercial decisions, product strategy, and user conversations.
• Work across frontend and backend to ship real features.
• Shape both product and business from the inside.

Skills

C#

.NET

React

Azure

Job description

Full Stack Software Engineer

SaaS | Early-Stage Start-Up | Experienced Founders | C# | .NET | TypeScript | React | Azure

I’m hiring a Full Stack Software Engineer to join one of the most ambitious, talented, and genuinely brilliant teams I’ve worked with. This is a rare opportunity to work directly with proven founders on an early-stage product with huge potential. They're rebuilding the infrastructure of a legacy industry from the ground up - no silos, no red tape.

Location: London

Working Policy: Onsite full-time - it's early stage, and the team gets massive value from in-person collaboration

Salary: Up to £100,000 (depending on experience) + meaningful equity - it's a brilliant time to join

Interview Process: 3 stages. We keep things fast, focused, and respectful of your time.

You'll be a Full Stack Software Engineer in a small, fast-paced team, working across frontend and backend to ship real features using C#, .NET, React, and Azure. You must be confident across the stack - this role offers real autonomy and end-to-end ownership.

This isn’t just an engineering role. You’ll be actively involved in commercial decisions, product strategy, and user conversations - not just handed tickets.

• Mid–Senior Full Stack Software Engineers — while we don’t fixate on years, 3+ years' experience is typically what we'd expect. We need engineers to hit the ground running.
• Strong across C#, .NET, and React
• Passionate about building great products users actually love. Experience in FinTech or B2B SaaS would be highly advantageous but by no means an essential.
• Excited by early-stage, in-office startup life
• Hungry to build something with lasting impact

You’ll work closely with founders, shaping both product and business from the inside. If you're a Full Stack Software Engineer who wants real ownership, fast learning, and to build with C#, .NET, React, and Azure - apply now.