Back End Developer

Propel; Greater London; On-site; GBP 70,000 - 90,000; Full time

Benefits offered by this job

4-day work week (paid for 5)

Remote-first flexibility

Work with a mission-driven team

Job summary

A forward-thinking tech company in London is seeking a Senior Backend Engineer to join their mission-driven team. This remote-first role focuses on building core backend systems that transform frontline public services using AI. With a commitment to code quality and social impact, the ideal candidate should have 5+ years of experience with backend services, expertise in Python/Flask, and hands-on AWS experience. The company offers a 4-day work week (paid for 5) and a chance to work on meaningful projects that improve lives.

Qualifications

• 5+ years of professional engineering experience in backend services/APIs for enterprise-grade applications.
• Experience with async patterns preferred.
• Passionate and driven to improve lives through technology.

Responsibilities

• Build and scale core backend systems, APIs, data pipelines, and integrations.
• Collaborate with teams to deliver tools for frontline workers.
• Write maintainable, tested, and secure code.
• Make technical decisions and shape architecture as the product grows.

Skills

Building backend services/APIs

Expertise in Python/Flask

Hands-on experience with AWS

Interest in AI systems/LLMs

Job description

Senior Backend Engineer – Remote first, London office (UK)

I’m working with an exciting client who is looking for a Senior Backend Engineer to join their mission-driven team transforming frontline public services with AI. This is a unique opportunity to work on cutting-edge technology that helps teams delivering citizen services, from employability and housing to well being and justice, reduce admin, improve compliance, and spend more time on meaningful human work.

What You’ll Do

• Build and scale core backend systems, APIs, data pipelines, and integrations
• Collaborate with CTO, product, and design teams to deliver tools used by real frontline workers
• Write maintainable, tested, and secure code that scales with real-world impact
• Make key technical decisions and help shape architecture as the product grows

What We’re Looking For

Our client isn’t just hiring skills, they’re hiring the right person. You’ll thrive in this role if you are:

• Passionate about the work you do and the impact it has
• Driven and invested in building technology that improves lives
• Reliable and consistent, with a strong sense of ownership and judgement

You’ll also bring

• 5+ years of professional engineering experience, building backend services/APIs for enterprise-grade applications
• Expertise in Python/Flask; async patterns a plus
• Hands-on experience with AWS or similar cloud platforms
• Interest or experience in AI systems/LLMs

Why Join

• Help reshape how frontline services work in the UK and beyond
• 4-day work week (paid for 5) and remote-first flexibility
• Work with a small, mission-driven team backed by world-class partners
• Be part of something transformative and build tech that truly matters

If you care about code quality, values, and real social impact, please send your CV to [e-mail]