Senior/Lead Full-Stack Developer (RELOCATION TO LONDON)

Madfish; United Kingdom; Hybrid; GBP 60,000 - 80,000; Full time

Job summary

A technology startup in the UK seeks an experienced Software Engineer to architect and develop full-stack solutions. Ideal candidates have 5+ years in software development, strong skills in Node.js, C++, or Python, and a background in designing scalable SaaS architectures. The role offers competitive compensation, share options, and work flexibility with a focus on transparency and honesty.

Benefits

Competitive compensation

Share options

Relocation package

28 vacation days

Gym membership

Modern hardware equipment

Qualifications

• 5+ years of professional software development experience.
• Strong back-end expertise in Node.js, C++, or Python.
• Proficiency in React for production-level applications.

Responsibilities

• Architect, design, and develop a full-stack solution.
• Build a robust and scalable product for engineers.
• Integrate with third-party toolchains and cloud clusters.

Skills

Software development experience

Node.js

C++

Python

React

Cloud platforms

Database design and management

SaaS architecture

Job description

Overview

Our client is a technology startup founded by engineers with 25 years of combined experience delivering everything from hypercars to buses. Their vision is bold: to automate the development of control software. Unlike others, they do not rely on third-party LLMs. Instead, they have developed their own foundation model entirely from scratch, using novel technology. This is not about automating code snippets or creating an assistant — it is about building a standalone engineer.

What we are looking for

Soft Skills

• Hard-working mindset: delivery above all else!
• Curiosity-driven: eager to understand systems at a fundamental level, always willing to peek under the hood
• Architectural thinking: ability to see the whole system and design end-to-end
• Smart, resilient, detail-oriented, and super fast

Hard skills

• 5+ years of professional software development experience
• Strong back-end expertise in one or more of the following: Node.js, C++, Python
• Production-level proficiency with React
• Strong understanding of cloud platforms (e.g., AWS, Azure)
• Familiarity with database design and management (SQL, NoSQL)
• Ability to design and build large-scale SaaS architectures from scratch

What you will do

• Architect, design, and develop a full-stack solution around the client’s core technology
• Build a product for engineers: robust, scalable, and performant
• Integrate with third-party toolchains and cloud-based clusters
• Optimize the system for performance, scalability, and security

Benefits

• Competitive compensation + share options
• Total freedom in technology stack. Select a setup that makes the product (and you) efficient
• Brutal honesty and extremely transparency — no management jargon, only the simple truth
• Relocation package and visa sponsorship
• 28 vacation days + UK public holidays
• Modern hardware equipment
• Gym membership in London