Senior Software Engineer (AI)

Location of position: Sydney, Australia
Employment Type: Full Time

About Eucalyptus

We’re on a mission to make good health last a lifetime. More than 1 billion people live with obesity worldwide, driving preventable chronic conditions. We’re here to build better long-term care.

Euc is the company behind Juniper, one of the world’s largest weight-management programs combining GLP-1 medication with personalised nutrition, movement support, and clinician-led care from prescribers, nurses, health coaches, pharmacists, and dietitians. Our published clinical research shows that our combined clinical and behavioural approach helps patients lose significantly more weight during their treatment with Juniper by four times.

Our Growth Story:

• 130% YoY revenue growth and 90% reduction in cash burn, with $100M+ raised from investors including BOND, NewView, Blackbird and Airtree.
• Scaled to over 100,000 monthly active patients across our weight-management program.
• Grew the UK patient base from 4,000 to ~40,000 and received selective NICE endorsement to provide services to the NHS.
• Tailored our offering to over 5,000 patients in Germany and Japan

About the role (What you'll be doing)

Eucalyptus is looking for a Senior Software Engineer I, Full Stack (AI focus) to join our high-performing engineering team. You’ll be part of a highly collaborative 40-person engineering group, building higher touch, higher quality healthcare technology that our patients around the world love using — now with AI as a core part of our platform.

• Be a key engineering voice in designing and building scalable, production-grade AI-powered features across our multi-brand platform — from patient-facing conversational tools to intelligent decision-support systems.
• Integrate with foundational LLM APIs (Gemini, OpenAI, etc.) and design scalable architectures for generative use cases, including RAG and multi-agent systems.
• Work closely with cross-functional stakeholders in product, design, marketing, creative, analytics, and operations to deliver the best AI-enabled telehealth experiences for our patients.
• Act as the AI subject matter expert — run demos, lead workshops, pair program, and document best practices to accelerate AI adoption across the eng org.
• Provide architectural guidance and ensure AI systems are production-ready, safe, and scalable.
• Lead the creation and ownership of shared LLM infrastructure (prompt management, evaluation tooling, safety/observability) in collaboration with Data Engineering and ML Ops.

What success looks like in this role:

• Short-term (first 5 months): personally design, build, and ship at least one customer-facing LLM-powered feature end-to-end.
• Long-term: enable all engineering teams to independently deliver LLM features by providing shared infrastructure, tooling, and best practices.

About you (Who you are)

• Strong full-stack engineering track record (Typescript, Go/Node, GCP, distributed systems).
• At least 1–2 years of recent, hands-on experience building LLM-powered features in production (e.g. conversational agents, personalised recommendation engines, retrieval-augmented systems, or agentic collaborative multi-agent systems).
• Familiarity with LangChain, LangGraph, RAG patterns, and other common LLM integration frameworks.
• Comfortable operating in an 80:20 individual contributor to tech leadership split, with scope to grow leadership responsibilities over time.
• Exceptional ability to break down projects, estimate timelines, and execute complex initiatives with multiple workstreams.
• Excellent written and verbal communication skills, with the ability to simplify complex AI concepts for different audiences.
• Experience building reusable components and AI-enabled services across multiple applications and codebases.
• You are curious and resourceful — comfortable navigating ambiguity, exploring new approaches, and solving problems without always having all the answers.
• Bonus: experience in regulated environments, AI observability tooling, or guiding AI adoption in a team new to AI.

Why you should join Engineering at Euc

• We’re on a quest to build a robust, scalable, configurable, multi-brand platform (that’s also enjoyable to work on!) on which we can solve the world’s biggest healthcare challenges, and you can be a pivotal player in that journey.
• We have a high performance culture
  • We have a high bar for talent, so you’ll get to learn from some of the best engineers in the industry
  • We write as many low quality memes as we do high quality PRs
  • We optimise for velocity and deploy to production hundreds of times a month. Once you merge your code, it’s in prod in minutes
• You’ll get to work with a modern tech stack that we’re always improving. If something isn’t working for us, we’ll iterate until we get it right and everyone on the team is encouraged to help refine it.
  • Frontend: React, React Native + Expo, TypeScript, Apollo, Tailwind
  • Backend: Node (TypeScript) and Go microservices, Federated GraphQL, gRPC, Protobufs, Pub/Sub and Postgres, hosted on GCP Kubernetes Engine (GKE)
• You’ll work on interesting engineering challenges:
  • Euc has a large appetite for product development, so we have a roadmap of innovative, greenfield features to work on
  • We've been running microservices smoothly in production for a few years, but there is still a lot of complex business logic in our legacy mono-repo to understand, break down, improve and port across.
  • We strive for efficiency and invest heavily in internal tooling to improve developer experience
• We’ll invest in your growth, development and career
  • When we introduced Go microservices we invested in upskilling the whole team in a new language
  • No matter which direction you want to take your career, we’ll provide opportunities for you
  • Every engineer has a yearly Learning and Development budget that they can use for courses, books, conferences, anything to help you learn.

Why join Eucalyptus?

Euc is also behind a growing family of digital healthcare clinics (Pilot, Kin, Software, Compound) across men’s health and well-being, fertility, skincare, and preventative health.

Here’s what makes joining Euc unique:

• What’s next - Our goal for the next three years is to support 1 million patients globally to live better for longer. We’re launching into new conditions, demographics, and geographies as we build a truly preventive healthcare ecosystem.
• Build something world-changing - We’re on the path to becoming the world’s largest international digital healthcare company. It will be challenging, fast-paced, and deeply rewarding.
• Make real impact - You will deliver work that directly shapes patient outcomes and scales evidence-based care across markets.
• Accelerate your growth - You will have high ownership, continuous feedback, and dedicated development support.
• Join a motivated team - You will collaborate with talented peers to solve complex clinical and operational problems at scale.

What’s ahead in Australia?

• Grow with us globally - Get mentorship from leaders across Australia, the UK, Germany, and Japan, collaborate with teams in the Philippines and South Africa, and explore new markets or travel internationally. Recognised on Hatch’s Hotlist as one of Australia’s top employers, we support early-career professionals to become future global leaders.
• Shape your career - Access learning budgets, conferences, certifications, peer shadowing, and a global knowledge-sharing culture.
• Be an owner - Equity for everyone means you share in our success.
• Work where well-being matters - Experience catered wellness talks, exercise classes, whoops to track your wellbeing, free barista coffees, funded social clubs, and quarterly rooftop parties.
• Innovate with purpose - Use state-of-the-art tools and contribute to bold, impactful solutions in healthcare.
• Support at every stage - Benefit from parental and miscarriage leave, to health, professional development, and personal days, Whoop membership, and our Employee Assistance Program.

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.