Junior Software Engineer jobs in United Kingdom

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.

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:

• Run structured, data-informed experiments to improve the UK market’s conversion funnel
• Extend the core platform to better serve UK-specific customer journeys
• Prioritise initiatives that create real business impact, not just vanity metrics
• Improve retention and repeat order rates through localised product improvements
• Deliver polished, seamless front-end experiences across high-leverage touchpoints
• Collaborate with Australian product teams to co-develop scalable global solutions, while advocating for UK market needs
• Partner closely with non-technical teams to align on strategy, translate engineering work into actionable insights, and accelerate delivery

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

• Strong React & TypeScript experience and proficiency in Node.js with GraphQL.
• Experience working in highly iterative, data-driven teams.
• Understanding of conversion funnel optimisation in a digital product.
• At least 6+ years of experience in a similar role at other startups or software companies under your belt.
• Experience building web products with our tech stack.
• Proven record of successfully breaking down projects, estimating timelines and consistently delivering high-quality work.
• Excellent written and verbal communication skills, with the ability to clearly explain technical concepts to non-technical audiences.
• You’re naturally curious and enjoy understanding how things work. Your problem-solving mindset is key here — you’ll have the autonomy to take ownership of challenges and determine the best path forward.

Nice to haves:

• Exposure to Go.
• Familiarity with data visualisation tools like Metabase or Tableau.
• Experience in growth-focused roles at startups.

• 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!

Note: This refined description focuses on the job responsibilities, qualifications, and the value proposition of joining Eucalyptus. It omits extraneous application form sections and regulatory boilerplate not essential to the role description.