Full Stack Software Engineer

Freelancer.com; Greater London; On-site; GBP 40,000 - 70,000; Full time

Job summary

A leading freelancing platform is looking for a Full Stack Software Engineer in London. In this role, you will work across the stack to optimise performance through frontend and backend technologies. Candidates should have 2-4 years of experience, strong skills in Angular and TypeScript, as well as familiarity with PHP, Python, or Go. Join us to make a significant impact on a platform that connects millions worldwide.

Benefits

Mentorship

Exposure to internet-scale challenges

Quarterly hackathons

Qualifications

• 2–4 years of professional experience as a full-stack or frontend engineer.
• Solid experience with Angular and TypeScript.
• Comfort working with backend technologies like PHP, Python, or Go.
• A good understanding of frontend performance optimisation techniques.

Responsibilities

• Identify and solve performance issues across both frontend and backend.
• Optimise page load speed, rendering performance, and API response times.
• Contribute to design system and build reusable UI components.
• Help maintain scalable backend systems for high-performance APIs.
• Collaborate with cross-functional teams on usability and accessibility.

Skills

Angular

TypeScript

PHP

Python

Go

Frontend performance optimisation

RESTful API design

Automated testing

Tools

Jest

Cypress

PHPUnit

Job description

Full Stack Software Engineer

London, United Kingdom

Description

We’re looking for a Full-Stack Software Engineer (2–4 years experience) to join our Platform Performance team and help us deliver lightning-fast, scalable experiences to millions of users around the world.

In this role, you’ll work across the stack—sharpening frontend speed, optimising backend services, and making our user interfaces more responsive, reliable, and delightful to use. You’ll collaborate with passionate engineers and product managers to identify performance bottlenecks, contribute to architectural improvements, and help evolve our design system.

This is a fantastic opportunity for an ambitious engineer looking to build their skills in a fast-paced environment and make a meaningful impact at scale.

is the world's largest freelancing and crowdsourcing marketplace, connecting over 80 million users across 247 countries, regions, and territories. Our platform enables businesses, entrepreneurs, and individuals to collaborate with skilled professionals from anywhere in the world, turning ideas into reality faster than ever before.

Our mission is bold: to create one billion jobs globally by empowering people to work for themselves and build sustainable careers online. Every feature we ship and every performance improvement we make brings us one step closer to enabling opportunity at an unprecedented scale.

What You’ll Do

• Identify and solve performance issues across both frontend (Angular) and backend (PHP, Python, Go).
• Optimise page load speed, rendering performance, and API response times.
• Contribute to our design system and build reusable UI components using Angular and TypeScript.
• Help maintain and evolve scalable backend systems for high-performance APIs.
• Collaborate with cross-functional teams to implement best practices in performance, usability, and accessibility.
• Participate in architecture discussions and continuously improve our codebase and tooling.
• Promote and support performance monitoring and testing practices.

What We’re Looking For

• 2–4 years of professional experience as a full-stack or frontend engineer.
• Solid experience with Angular and TypeScript.
• Comfort working with backend technologies like PHP, Python, or Go.
• A good understanding of frontend performance optimisation techniques.
• Familiarity with RESTful API design and backend performance considerations.
• Experience building and maintaining reusable UI components.
• Exposure to design systems or component libraries.
• Strong communication skills and a collaborative mindset.
• A proactive attitude, with the ability to take ownership and see tasks through.

Bonus Points (Nice to have)

• Understanding of accessibility and UI / UX design principles.
• Familiarity with SEO and frontend performance metrics.
• Experience with automated testing (Jest, Cypress, PHPUnit, etc.).
• CI / CD or DevOps knowledge.
• Open-source contributions or personal projects.

Why Join us

• Work on a platform with global impact—we’re on a mission to create one billion jobs.
• A culture that values ownership, transparency, and meritocracy.
• Fast-track your growth with mentorship, real ownership, and exposure to internet-scale challenges.
• Weekly CEO town halls, quarterly hackathons, and team events to keep you engaged and inspired.
• A chance to help build the tools and systems that power the next generation of our platform.