Senior Backend Engineer in London

Healthcare needs a better rhythm: one that keeps care continuous and deeply human. Heidi is building an AI Care Partner that works alongside clinicians to make that possible. We’re a team of doctors, engineers, designers, researchers, and creatives building tools that help clinicians stay focused on what matters most: their patients. In just 18 months, Heidi has given back more than 18 million hours to healthcare professionals — supporting 73 million patient visits in 116 countries. Today, more than two million patient visits each week are powered by Heidi worldwide. Backed by nearly $100 million in funding, we’re growing in the US, UK, Canada, and Europe, partnering with leading health systems including the NHS, Beth Israel Lahey Health, and Monash Health.

A Senior Software Engineer responsible for the execution of the backend features, with a deep technical understanding and how it translates to representing user needs. You will have operated in a hyper growth startup with experience building SaaS products. You will also have a deep understanding of the key challenges engineers face and a firm grasp on design principles in prioritizing key features and capabilities. Your superpower is how to bridge the gap between technical specifics and business needs effortlessly and turn high-level designs into real-world solutions. You thrive in challenging situations, and you appreciate the dynamics of a flexible, flat-structured work environment. You are quick to grasp the nuances and complexities of developing an AI product healthcare internationally. We know that brilliant people can come from unlikely places; if you have a proven track record of shipping spectacular technically challenging products and features, regardless of industry, we want to meet you.

What you’ll do:

• Ultimately you will have the opportunity to work with the engineering mastermind behind Heidi developing AI products which will change the face of healthcare.
• Autonomously deliver beautiful & robust code with considerations on code structure design and scalability.
• Implement and optimize data storage solutions.
• Design, build, and maintain high-performance backend systems using Python.
• Architect and manage cloud infrastructure, ensuring scalability and reliability.
• Develop and manage message queue systems for real-time data processing.
• Collaborate with frontend and AI teams to integrate new features and enhance existing APIs.
• Optimize API performance and handle API versioning, documentation, and testing.

What we’ll look for:

• Strong sense of ownership & strong problem-solving skills.
• 5+ years of backend development experience.
• Solid experience with MongoDB and Redis for data management.
• Experience building & managing message queue systems at scale.
• Writing testable, effective and communicative code.
• Data modeling, design patterns, understanding trade-offs.
• Deep understanding of API design principles, including security, versioning, and performance.
• Data & application security knowledge and skills.
• Experience in integrating with third-party systems.
• Competent with source code control and CI/CD pipeline technologies.
• Architecting and building highly available, scalable, secure & performant systems.

What do we believe in?

• Build to Last: We design for safety and reliability so clinicians, patients, and our teams can trust what we build every day.
• Own Your Practice: Ideas rise on merit, not title, and everyone shares responsibility for the standards we set together.
• Move Fast, Stay Steady: We move quickly but never at the cost of trust. Progress only matters if people can depend on what we make.
• Make Others Better: Honest feedback, steady support, and shared growth keep our teams improving together.

Why you will flourish with us?

• Unmatched impact. The rare chance to help shape and redefine what healthcare looks like.
• Real product momentum. We’re not trying to generate interest, we’re channeling it.
• Equity from day one. When Heidi wins, you win. You’ll share directly in the success you help create.
• Work alongside world‑class talent. Learn from some of the best engineers and creatives, joining a diverse team.
• Growth and balance. Enjoy a £500 personal development budget, dedicated wellness days, and your birthday off to recharge.
• Flexibility that works. A hybrid environment, with 3 days in the office.

Heidi is dedicated to creating an equitable, inclusive, and supportive work environment that brings people together from diverse backgrounds, experiences, and perspectives. Our strength is in our differences. We’re proud to be an equal opportunity employer and are proud to welcome all applicants as we’re committed to promoting a culture of opportunity for all. Help us reimagine primary care and change the face of healthcare in Australia and then around the world.