At a Glance
- Tasks: Lead the design and delivery of innovative healthcare tech solutions.
- Company: Join Onsera Health, a pioneering health AI company transforming cardiometabolic care.
- Benefits: Competitive salary, equity participation, and a chance to shape engineering culture.
- Other info: Collaborate with top experts and enjoy growth opportunities in a dynamic startup environment.
- Why this job: Make a real impact in healthcare while mentoring the next generation of engineers.
- Qualifications: 8+ years in full-stack development with strong leadership skills.
The predicted salary is between 36000 - 60000 £ per year.
The Challenge
Healthcare technology requires seamless integration of patient-facing applications, clinical systems, external partners, and financial workflows—while maintaining the security, reliability, and auditability that regulated environments demand. As healthcare AI advances and new treatment models emerge, the industry needs engineering leaders who can architect scalable platforms, drive technical excellence, and deliver production-grade systems that translate clinical requirements into real-world outcomes.
The Opportunity
Own the technical delivery and architecture of Onsera's core product platforms, from wearables integration and health data pipelines to member payments and AI workflows. As a player-coach, you'll design and implement full-stack solutions while setting engineering standards and help build and mentor our engineering team as we scale. This role offers the opportunity to shape API-first architectures, lead complex integrations with healthcare partners and SaaS platforms, and transition into engineering leadership as the organization scales.
What You'll Do
- Own technical delivery of multiple Onsera products from design through production and iteration
- Design and implement full-stack solutions spanning frontend applications, backend services, APIs, agentic systems and third-party integrations
- Define and evolve API-first, integration-driven architectures that support internal systems and external partners
- Lead complex integrations with SaaS vendors, healthcare partners, wearables platforms, and pharmacy fulfillment systems
- Architect and implement member payment platforms, including fee collection, reconciliation, and financial reporting
- Define and enforce software engineering standards, including coding conventions, testing practices, and documentation
- Conduct rigorous code reviews focused on correctness, security, performance, and maintainability
- Mentor engineers and gradually transition into line management as the engineering organization grows
Minimum Qualifications
- 8+ years of experience as a Full-Stack Engineer delivering production systems, with track record at Senior or Principal level
- Proficiency across frontend and backend development, including modern web frameworks and API design
- Proven experience integrating with third-party SaaS platforms and external partners
- Strong background in automated testing strategies and quality-driven development
- Experience acting as a technical leader or player-coach with demonstrated ability to mentor engineers
- Comfortable collaborating with product, data, clinical, and non-technical stakeholders
Preferred Qualifications
- Strong written and verbal communication skills for technical and cross-functional collaboration
- Experience working with Python
- Experience with payments, billing, or financial reconciliation systems
- Experience in healthtech, regulated environments, or sensitive data systems
- Familiarity with health data ingestion, wearable platforms (Apple HealthKit, Google Fit, Fitbit), or healthcare interoperability patterns
- Exposure to FHIR-based data exchange or healthcare integration standards
- Prior involvement in scaling engineering teams or platforms during growth phases
What We Offer
- Mission-driven work addressing critical healthcare challenges in cardiometabolic care
- Ground-floor opportunity to shape technical architecture and engineering culture
- Direct collaboration with product managers, data scientists, ML engineers, and clinical experts
- Partnership with a world-class team of venture capitalists, innovators, technologists, bioscientists, and clinicians
- Growth path into engineering leadership as the organization scales
- Competitive salary and benefits package, including participation in our equity program
About Onsera Health
We are an early-stage health AI company revolutionizing cardiometabolic care and population health economics. Our unique position within the PHP ecosystem provides:
- Venture track record: A proven track record of success in building biotech and healthcare companies
- Deep capital: Funding and resourcing to support deep tech and scientific R&D—and to drive growth
- Strategic guidance: Direct access to industry pioneers (including founders of The Medicines Company and Metsera), strategists (McKinsey/QuantumBlack alumni), and world-class scientific talent (e.g., scientific leaders at Oxford University, Ellison Institute of Technology)
- Expert network: Established connections across pharma, payers, and providers
- Startup agility: Ownership in the venture, founder mentality, and ground-floor impact
About PHP
Population Health Partners (PHP) is a premier investment firm established in 2020, aimed at transforming health outcomes for large populations. With offices in New York and London, PHP combines financial resources with industry-leading capabilities and technology. The firm's incubation portfolio includes Metsera (NASDAQ: MTSR) and Corsera Health.
Leadership: Led by industry veterans including Clive Meanwell (The Medicines Company), Chris Cox (The Medicines Company), and Whit Bernard (Metsera), bringing decades of founder experience and operational excellence in biopharma and healthcare, and Roy Berggren, 30+ year McKinsey Healthcare leader.
Principal Software Engineer - TypeScript/React in London employer: Onsera Health
Onsera Health is an exceptional employer, offering a mission-driven environment where you can make a tangible impact on healthcare challenges in cardiometabolic care. With a strong focus on employee growth, you will have the opportunity to shape technical architecture and engineering culture while collaborating with a world-class team of innovators and experts. The competitive salary and benefits package, including equity participation, further enhance the appeal of joining our dynamic and agile startup.
StudySmarter Expert Advice🤫
We think this is how you could land Principal Software Engineer - TypeScript/React in London
✨Join Local Tech Meetups
Get out there and mingle with fellow developers by joining local tech meetups. It’s a fantastic way to meet people who might be working at Onsera Health or know someone who does. Plus, you can pick up some trendy tech skills and trends while you're at it!
✨Contribute to Open Source Projects
Show off your coding chops by jumping into open-source projects. Not only does this give you practical experience, but it also gets you noticed in the dev community. You'll create a killer portfolio that speaks volumes about your skills to Onsera Health.
✨Tap into Online Developer Communities
Don’t underestimate the power of online developer communities like GitHub, Stack Overflow, and even Reddit. Participate in discussions, share your projects, and build your visibility. We can often find opportunities through these channels that can lead to a full-time gig at companies like Onsera Health.
✨Explore Job Boards Specifically for Tech Roles
Keep your eyes peeled on job boards that focus on tech roles. Sites like TechCareers or Stack Overflow Jobs can often have listings for companies like Onsera Health that might not show up on broader job sites. Make it a habit to check these regularly, and don’t hesitate to apply directly through our website!
We think you need these skills to ace Principal Software Engineer - TypeScript/React in London
Some tips for your application 🫡
Show off your coding skills:When applying for a software engineering role, it's super important to showcase your coding skills. Make sure your CV includes your tech stack, any relevant programming languages you’re comfortable with, and examples of projects you've worked on. If you have a GitHub profile, link it up! We love to see code in action.
Tailor your portfolio:For a full-time role, we’d expect to see some solid examples of your work in your portfolio. Make sure to include at least two or three projects that highlight your problem-solving skills and your ability to work with different technologies. Focus on the projects that are most relevant to the position at Onsera Health.
Craft a killer cover letter:Your cover letter is your chance to stand out—make it personal! Explain why you want to work at Onsera Health and how your skills align with the role. Show us your passion for software development. We dig enthusiastic candidates who understand the value of collaboration and continuous learning!
Be clear and concise:When it comes to writing your CV and cover letter, clarity is key. Avoid jargon that could confuse us and stick to simple, direct language. Highlight your achievements with quantifiable results where possible, and keep everything easy to read. A well-organised application goes a long way!
How to prepare for a job interview at Onsera Health
✨Brush Up on Your Coding Skills
For a full-time software engineering role, it's crucial that we stay sharp with our coding abilities. Expect technical questions that might involve solving problems on the spot or discussing algorithms. Practise on platforms like LeetCode or HackerRank to get comfortable with the types of questions that often come up.
✨Know Your Tools and Frameworks
Make sure we’re well-acquainted with the tools and technologies listed in the job description. Familiarise ourselves with any specific frameworks or programming languages mentioned. If Onsera Health uses React or Node.js, for instance, be ready to discuss how we’ve used them in previous projects or coursework.
✨Showcase Your Projects
Bring along a portfolio that highlights our best work. This could be code samples, GitHub repositories, or any side projects we’ve built. Make sure we can talk through our thought process for each project, especially the challenges we faced and how we solved them—this shows our problem-solving skills in action.
✨Prepare for Behavioural Questions
While technical skills are key, full-time positions also require cultural fit. Be ready to discuss our previous experiences and how we handle teamwork, conflict, and deadlines. Brush up on the STAR method—Situation, Task, Action, Result—to clearly articulate our past experiences when discussing how we've contributed to a team.
