Senior Software Engineer at Thriva Limited

This is a job that Jill, our AI Recruiter, is recruiting for on behalf of one of our customers. She will pick the best candidates from Jack's network The next step is to speak to Jack. Job Title: Senior Software Engineer Company Description: Thriva Limited - Personalized health-tech platform scaling proactive at-home testing. Job Description: Join a small, high-impact product team leveraging cutting-edge AI to bridge the gap between lifespan and healthspan. As a Senior Engineer, you will build and evolve the backend systems powering both direct-to-consumer and B2B health platforms. You'll work across a modern Ruby on Rails and TypeScript stack to deliver clinical insights at scale. Location: London, UK Why this role is remarkable: Work at the forefront of health-tech using AWS Bedrock and Langfuse to integrate AI-driven insights into personalized patient health journeys. Join a collaborative, high-autonomy environment that biases toward action, utilizing modern tooling like Terraform, Kubernetes, and automated CI/CD pipelines. Enjoy a wellness-focused culture including a monthly £100 Thriva credit, an annual "treat yourself" budget, and a well-equipped central London office. What you will do: Design and evolve scalable backend architectures using Ruby on Rails to support complex clinical data and asynchronous messaging systems. Collaborate cross-functionally with designers and product managers to shape product outcomes and proactively solve ambiguous technical challenges. Implement modular, well-tested code across the stack while exploring AI-assisted development workflows to increase team velocity and impact. The ideal candidate: Possesses 5+ years of commercial software experience with deep expertise in Ruby on Rails and designing production-grade backend systems. Demonstrates a pragmatic, action-oriented mindset with the ability to break down complex problems into modular, maintainable code using RSpec or Jest. Shows curiosity for modern frontend frameworks like Vue3 or Nuxt and an active interest in staying ahead with AI-driven development tools. Who are Jack & Jill? 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. 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. Next steps Step 1. Visit our website. Step 2. Click 'Talk to Jack'. Step 3. Talk to Jack so he can understand your experience and ambitions. Step 4. Jack will make sure Jill (the AI agent working for the company) considers you for this role. Step 5. If Jill thinks you're a great fit and her client wants to meet you, they will make the introduction. Step 6. If not, Jack will find you excellent alternatives. All for free. We never post fake jobs This isn't a trick. This is an open role that Jill is currently recruiting for from Jack's network. Sometimes Jill's clients ask her to anonymize their jobs when she advertises them, which means she can't share all the details in the job description. We appreciate this can make them look a bit suspect, but there isn't much we can do about it. Give Jack a spin! You could land this role. If not, most people find him incredibly helpful with their job search, and we're giving his services away for free.