Senior Backend Engineer - UK in London

Heidi is building an AI Care Partner that supports clinicians every step of the way, from documentation to delivery of care. We exist to double healthcare’s capacity while keeping care deeply human. In 18 months, Heidi has returned more than 18 million hours to clinicians and supported over 73 million patient visits. Today, more than two million patient visits each week are powered by Heidi across 116 countries and over 110 languages.

Founded by clinicians, Heidi brings together clinicians, engineers, designers, scientists, creatives, and mathematicians, working with a shared purpose: to strengthen the human connection at the heart of healthcare. Backed by nearly $100 million in total funding, Heidi is expanding across the USA, UK, Canada, and Europe, partnering with major health systems including the NHS, Beth Israel Lahey Health, MaineGeneral, and Monash Health, among others.

The Role: 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?

• Heidi builds for the future of healthcare, not just the next quarter, and our goals are ambitious because the world’s health demands it.
• We believe in progress built through precision, pace, and ownership.
• Live Forever - Every release moves care forward: measured, safe, and built to last. Data guides us, but patients define the truth that matters.
• Practice Ownership - Decisions follow logic and proof, not hierarchy. Exceptional care demands exceptional standards in our work, our thinking, and our character.
• Small Cuts Heal Faster - Stability earns trust, speed delivers impact. Progress is about learning fast without breaking what people depend on.
• Make others better - Feedback is direct, kindness is constant, and excellence lifts everyone. Our success is measured by collective growth, not individual output.

Our mission is clear: expand the world’s capacity to care, and do it without losing the humanity that makes care worth delivering.

Why you should Join Heidi:

• 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.
• Unmatched impact. Play a pivotal role at a critical growth moment - working on a product that delivers tangible, real-world value to clinicians and patients every day.
• Work alongside world-class talent. Join a team of operators and builders who've scaled unicorns.
• Your health, covered. Comprehensive private medical and dental cover through Bupa, plus 24/7 mental health, coaching and wellbeing support through Sonder and a £100/month Healthy Heidi’s stipend.
• Global parental leave. 26 weeks paid for primary carers and 18 weeks for secondary carers, subject to eligibility.
• Fertility support. £7,000 one-off payment, eligibility applies.
• Learning & development. £700 per year for courses, books, memberships, conferences and more.
• Home office budget. £500 one-off to set up a workspace you actually want to work in.
• Recharge days after major milestones and busy periods so you can reset and come back strong.
• Work from anywhere for up to 4 weeks per year, wherever the world takes you.
• Clinical leave. 10 days per year for eligible clinical roles to maintain accreditation and requirements.
• Flexibility that works. A hybrid environment, with 3 days in the office.

Heidi’s commitment to Diversity, Equity and Inclusion: 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.