Senior Software Engineer II, UK

About Euc
We’re making good health last a lifetime. More than 1 billion people globally live with obesity, a major leading indicator of many preventable chronic diseases such as diabetes and heart disease. Eucalyptus is the company behind Juniper, one of the world’s largest weight management programs combining GLP-1 medication with a tailored nutrition and exercise programme for women, supported by our multidisciplinary care team of prescribers, health coaches, dietitians, nurses and pharmacists. More recently, we have launched Compound, our men’s health brand dedicated to proactive, personalised healthcare solutions. Together with our other brands (Kin, Pilot, and Software), Juniper and Compound form part of our broader mission to solve the world’s biggest healthcare challenges by combining clinical care, science, and technology.

Our published clinical research demonstrates that our combined approach to weight management and lifestyle change means that our patients are 4x as likely to lose significant weight through their course of treatment with Juniper. Since launching, we’ve grown fast to support millions of patients. In 2024 alone, in the UK we quadrupled the size of our business, received selective NICE endorsement for our holistic approach to obesity management, and grew our team from 45 to 165. Globally, we grew revenue by >120% YoY, while reducing cash burned by 90% YoY, with over $100M USD raised from global investors such as BOND, NewView, Blackbird and Airtree - early backers of companies like Canva, Stripe and Airbnb.

What’s next? In 2025, we are charting the path to support hundreds of thousands of patients while launching into new conditions, demographics, and geographies as we move towards our vision of creating a preventive healthcare ecosystem. We’re going to build the world’s largest international digital healthcare company. This will be a challenging task, but it will be very rewarding and possibly the adventure of a lifetime, working with some of the best operators you will ever encounter. If that gets you excited, let’s talk.

About the role (What you’ll be doing)
This role is part of our growing UK engineering team, working in close partnership with our platform and product teams in Australia. The UK team is focused on locally prioritised initiatives that respond to patient needs and market dynamics. Being embedded in the UK allows us to stay close to the challenges and opportunities unique to this market — enabling us to refine and extend the platform in ways that drive meaningful, sustained outcomes.

As part of this team, you’ll work on complex workflows that sit at the very core of how our patients access care. These workflows require creativity, experimentation, and structured problem-solving—you’ll balance building robust, scalable systems with tailoring local solutions that can flex to new regulations, clinical protocols, and user behaviours. You’ll also spend significant time working cross-functionally with teams outside of tech — including growth, marketing, and operations. Success in this role means being able to translate complex technical concepts into clear, non-technical language so that cross‑functional partners can engage, contribute, and move quickly. Your ability to distill ideas will enable smoother collaboration, faster iteration, and better patient outcomes.

Here are some examples of recent UK team projects:
We developed a powerful patient segmentation model that classifies individuals into risk categories from their questionnaire data, enabling prescribers to deliver more precise and timely interventions to those who need it most. Right now, we’re focused on transforming our onboarding system so it can handle multiple flows and questionnaires, expanding our reach and making it possible to connect with more patients than ever before.

Expect to:

• Lead technical execution across multiple systems
• Make high‑impact architectural decisions that improve system performance, modularity, and maintainability
• Lead design reviews and champion engineering best practices that raise quality across the team or domain
• Guide teammates through technical ambiguity, enabling the team to move forward effectively in the face of uncertainty
• Collaborate with product and design leads to shape product direction and ensure technical feasibility aligns with user needs
• Identify and resolve systemic issues, proposing improvements that prevent recurring problems and improve development velocity
• Demonstrate strong ownership and judgment, consistently delivering high‑quality outcomes under dynamic conditions
• Mentor across teams, accelerating the growth of engineers through technical guidance and constructive feedback

This is not a role for surface‑level optimisation — it’s about creative, insight‑led engineering that makes healthcare simpler, safer, and more accessible.

About you (Who you are)
You’re an experienced engineer who combines deep technical skill with strong architectural thinking and a collaborative mindset. You thrive on solving complex problems that have real‑world impact — and you care as much about how your team builds as what you build.

• Deep technical expertise – Strong experience with React and TypeScript, plus proficiency in either Node.js or Go, designing scalable, resilient systems across the stack.
• Architectural leadership – You’ve led major technical initiatives, defined system patterns, and guided teams through complex design decisions.
• Product‑minded problem solver – You balance technical ambition with product impact, working closely with design and product to deliver meaningful outcomes.
• Data‑driven and pragmatic – You use experimentation and metrics to inform decisions, improving performance, conversion, and user experience.
• Mentor and collaborator – You elevate those around you through code reviews, technical guidance, and clear, empathetic communication across disciplines.

8+ years experience in software engineering, with a track record of delivering high‑quality, maintainable systems in fast‑paced product environments.

Nice to haves:
Familiarity with data visualisation tools like Metabase or Tableau. Experience in growth‑focused roles at startups.

So, why join Eucalyptus?
Make real impact, fast – You’ll see your work influencing patient journeys immediately, from improving onboarding to refining prescription workflows. Collaborate globally – You’ll work hand-in-hand with talented colleagues in both London and Sydney, shaping solutions that scale internationally. Stretch your creativity – This role is full of open-ended challenges that demand inventive problem‑solving and critical thinking. Cross‑functional influence – You won’t just code in a silo. You’ll play a vital role in shaping how engineering interacts with growth, marketing, operations, and care teams. Accelerate your career – Regular feedback, bi‑annual reviews, and a personal development budget to ensure you’re growing as quickly as we are. Work with passionate peers – Our talent bar is high, our mission is ambitious, and our culture is supportive.

We also offer a range of benefits including:

• Your own stake in the business with our employee options program
• Newly opened HQ in vibrant Old Street, designed for focus and collaboration
• A flexible hybrid setup: 3 days a week in our Old Street office
• A monthly wellness allowance, for you to spend on whatever wellness means to you
• A yearly personal development budget and 3 extra days of leave to continuously up‑skill yourself
• 25 days holiday + bank holidays with an enhanced parental leave policy
• Work from anywhere policy 3 weeks per year
• A fun office with regular socials including after‑school sport, clubs, cycle kick‑offs, and seasonal parties (last winter we celebrated in Paris!)
• Your own MacBook and more!

Want to hear more about what it’s like to work at Eucalyptus? Hear from our team here or check us out on Instagram @eucalyptus.health. At Eucalyptus, we value individuals from all backgrounds, experiences, and perspectives, and we embrace the unique qualities each person brings. When you apply, please let us know of any reasonable adjustments you may need during the interview process.