Senior Full Stack Engineer (Contract)

Location: Remote within EU (Offices in London and Frankfurt)

Employment type: Contract

TL;DR

We’re looking for a product-focused senior full stack engineer working in TypeScript and React with experience building, maintaining and monitoring web applications. You’re a self-starter who’s happy to tackle complex technical problems across the stack and loves team-wide collaboration to take an idea from zero to production.

What are we building?

A personalised health coaching platform for people with chronic kidney disease. Our goal is to delay and in some cases eliminate the need for dialysis, dramatically improving patient quality of life. We bring together health coaches, nutritionists, nephrologists and technology to provide affordable, patient-focused chronic care.

About Oska

Oska is a young health tech startup headquartered in Germany, with team members spread across Europe and hubs in Frankfurt and London. Our team includes medical professionals and health tech experts with substantial industry experience. We're welcoming, fun, open-minded and transparent.

Who are we looking for?

You love collaborating within multidisciplinary agile teams and value pairing with other devs

You want to do things properly but you’re pragmatic - you know how to make the right tradeoffs and keep tech debt under control

You’d love the opportunity to work with other experienced devs on existing products and build entire stacks from scratch

You’re experienced in using AI to speed up development but you understand its limitations and risks and know how to mitigate them

You’ve had, or are keen to have, experience building with AI frameworks to provide real impact

You value clear, concise communication. While it doesn’t need to be your first language, you’re able to speak and write English to an advanced level.

You can articulate and defend architectural decisions

You’re thoughtful, generous with your time and knowledge, enjoy mentoring and want the chance to grow professionally

Technical experience must haves

Architecture: You’ve designed complex systems from scratch and maintained them over time

TypeScript: This is one of your core competencies; you have a deep understanding of the type system and appreciate the value of end-to-end type safety

Backend: You’ve built Node servers from scratch, understand the benefits of meta frameworks and have ideally used an RPC layer of some kind

Frontend: You have a deep understanding of React, data fetching/mutation, state management, form management, design/component systems and styling

Testing: Comfortable with unit, integration and end to end tests and know when to apply each of them.

Data stores: You’re happy designing schemas for relational databases, performing migrations and querying with or without an ORM. If you have experience of KV stores or other types of databases, that’s a bonus

Infra: You have some experience of configuring, deploying and monitoring applications using AWS, GCP or another cloud provider

Documentation: You can succinctly and clearly document technical decisions and processes

GIF selection: Hands on experience with disappearing Homer, crying Dawson, dramatic chipmunk and more

Technical nice to haves

Terraform or another IaC system

React Native

AI engineering experience (agentic frameworks, RAG, evals etc.)

Our stack

Frontend: React/React Native, Shadcn, Tailwind

What will you be working on?

Building new features that cut across a patient-facing React Native app and a NextJS back office

Helping shape the tech stack and architecture for a new patient-facing web app

Integrating with 3rd parties such as auth, real-time comms (video/audio/text) and connected health devices

Using LLMs, agentic frameworks and RAG to improve health coach efficiency

Helping to hire a great team and building a diverse, open and welcoming culture

Mission: Work on products that directly improve the lives of chronic care patients

Impact: You’ll be working as part of a small, fast-moving team

Ownership: You’ll be helping us define what the next phase of Oska looks like, leading projects and overseeing parts of the stack.

Experience: You’ll be working across the entirety of a modern stack with opportunities to experiment with new technology and build new products from scratch

Is there anything else to know?

The role is fully remote but there are hubs in London and Frankfurt. Employees that live near these locations usually come in twice each week and you’re very welcome to join them

We get together every quarter somewhere in Europe

We’re currently only accepting candidates from the EU