You will join a high-impact product team building the infrastructure for proactive healthcare. Working across a modern stack including Ruby on Rails and AI-driven workflows, you will design backend architectures that power both direct-to-consumer and B2B platforms. This role is perfect for engineers who value autonomy, pragmatic decision-making, and shipping code that improves lives.
Back to all jobs
Learn about Jack
Senior Software Engineer at Thriva
Join a mission-driven London healthtech scale-up closing the gap between lifespan and healthspan. This role offers the chance to work with a modern stack including Ruby on Rails and cutting-edge AI infrastructure like AWS Bedrock and RubyLLM. If you are a Senior Engineer who values autonomy, pragmatic architecture, and building products that have a genuine positive impact on lives, this is your opportunity to lead within a high-impact, cross-functional team. Enjoy equity, a central Old Street office, and a culture that biases toward action.
About this role
Role overview
About the company
Thriva is a healthtech company on a mission to close the gap between lifespan and healthspan. We help people take control of their health through proactive at-home blood testing, clinician-reviewed results, and personalised, evidence-backed actions, combining clinical rigour with cutting-edge AI to deliver precise insights and deeply personalised guidance at scale. Alongside our direct-to-consumer product, our B2B platform enables partners to offer the same powerful health testing and insights to their own customers.
What you'll do
What you will do
- Design and evolve robust backend architectures in Ruby on Rails to support a scaling healthcare platform and B2B ecosystem.
- Proactively break down ambiguous product problems into clear next steps, using drafts and spikes to create momentum.
- Collaborate across the full stack with Vue3/Nuxt frontend engineers to deliver modular, well-tested, and maintainable software.
Who you are
Who this is a fit for
- Possesses 5+ years of commercial backend experience with deep proficiency in Ruby on Rails and production systems architecture.
- Demonstrates a bias toward action and pragmatic decision-making, comfortable taking ownership of solutions rather than just raising issues.
- Actively explores modern AI-assisted development workflows to increase team effectiveness and stays at the forefront of software development trends.
Why this role
Why this role is remarkable
- Impact-driven mission focused on clinical rigor and intelligent, adaptive systems that redefine personal health journeys at scale.
- Mature AI-assisted development culture using AWS Bedrock, Langfuse, and RubyLLM to accelerate experimentation and unlock new product capabilities.
- Excellent perks including equity options, an annual "treat yourself" budget, and a well-equipped central London office at the White Collar Factory.
Jack & Jill
How Jack & Jill work together
I get to know what you’re great at, then find roles you’d never find yourself.Ok, I'll go first. I'm Jack, an AI that gets to know you on a quick call, learning what you're great at and what you want from your career. Then I help you land your dream job by finding unmissable opportunities as they come up, supporting you with applications, interview prep, and moral support.
I recruit from Jack’s network and make the intro when I spot a great match.And I'm Jill, an AI Recruiter who talks to companies to understand who they're looking to hire. Then I recruit from Jack's network, making an introduction when I spot an excellent candidate.
Meet Jack
Jack gets to know what you're great at and what you want next, then searches 15 million jobs daily and helps you discover roles at companies like this.
How does this work?
Jack’s an AI agent for job searching and career coaching. He works for you.
Jill is the AI recruiter working for the company. She recruits from Jack’s network.
If it’s a match and the company wants to meet you, they’ll make the intro. In the meantime, if you’d like, Jack will send you excellent alternatives.