Senior Backend Engineer

MANUAL is a fast growing Healthtech scale‑up, aiming to be the healthcare provider that millions of people trust as their partner to a long and healthy life. Our platform allows users to quickly and safely diagnose possible conditions, get treatment and support them afterwards to live a higher quality life. To do this we are building an all‑in‑one healthcare platform which brings together world leading medical expertise and technical excellence.

We are looking for an experienced Backend Engineer to join our growing global team and contribute to our mission to improve our patients' health and their lives. This is a hybrid role for our office in London (UK).

• You have a genuine enthusiasm for software engineering and enjoy finding the right solution to the problem at hand and making practical trade-offs
• You are excited about contributing to a product that can drive positive change to the lives of millions of people around the world
• You have strong ownership mindset - “you build it, you run it”
• You’re eager to continuously learn, grow and step out of your comfort zone
• The idea of working in a successful, high growth startup in a fast paced role excites you

Develop scalable & reliable systems

• Develop core functionality for our own customer-facing and internal products, systems and data platforms, and e‑commerce capabilities using modern frameworks
• Develop extensible platforms and architectures that make it possible to quickly and efficiently launch new products and lines of business
• Develop and maintain integrations with third‑party systems
• Develop the APIs powering the web & mobile platforms for our product portfolio

Drive impact in a team environment

• You’ll work with other software engineers, designers, QAs, product managers, business stakeholders and domain experts
• You’ll drive impact and own your work end‑to‑end - from scoping & planning, architectural design decisions, implementation and testing, to production deployment and operations.

• Experience building web backends in Node.js/Typescript or a willingness to learn on the job
• Familiarity with scalable cloud architectures, design patterns and best practices
• Practical experience with CI/CD and IaC (Infrastructure‑as‑code)
• Experience with databases & data management practices - relational databases & search engines
• Experience with TDD and testable code - unit / integration / performance testing
• Great verbal and written communication skills and the ability to explain complex ideas in a simple way to non‑engineering teammates
• Ability to zoom in and out - be comfortable with getting into the relevant low‑level details while also making the optimal tradeoffs for achieving the “big picture” goals
• This is a hybrid role and you need to be based in Sofia (BG) so you can be in the office 3 days per week

• A degree in CS or equivalent is a plus
• Practical experience with building scalable & highly reliable cloud systems that support product used by millions of users around the world 24/7
• Familiarity with modern JS frameworks
• Experience working in cross‑functional teams
• An eye for user behaviour and design and attention to detail

• Team fit interview: you'll meet with product & tech leaders (45 mins)
• System Design Interview (60 mins)
• Meet the exec team (45 mins)
• Debrief (15 mins)
• Offer

Healthcare is broken. We’re fixing it — and we need your help.

Back in 2019, we launched MANUAL to tackle men’s health (starting with hair loss and sexual health). A few years later, we launched Voy with a focus on weight loss. But our ambition has always been bigger. Healthcare too often treats conditions in isolation, not people as a whole, and we're on a mission to prove there’s a better way.

In 2025, we evolved from MANUAL into Voy, a brand built for the long game: supporting people through every stage of life, not just a single diagnosis. Today, we support over 1 million members across the UK, Germany and Brazil, delivering personalised care across weight loss, menopause, hair loss and TRT (with more categories on the way).

Ready to join us and change how healthcare feels for millions of people?