Senior Fullstack Software Engineer - Ecosystem Experience
Senior Fullstack Software Engineer — Ecosystem Experience
At Semble , we are on a mission to enable health professionals to amplify their impact. We improve the way healthcare is delivered to millions of people by providing doctors and their teams with powerful, innovative, intuitive, and secure software.
Our cloud-based clinical system is already used by thousands of clinicians, making their lives easier and saving them money, while structuring their health data to help research.
You’ll join our Ecosystem Experience team — the group that connects Semble to the wider healthcare ecosystem: labs, pharmacies, partner APIs, webhooks, and Semble Connect, our automation platform built on Workato.
We work closely with Product, Business, and external partners, and we ship in a large TypeScript monorepo used across the company.
We are a passionate and driven team, proud to unite under strong cultural drivers:
- Impact — We do work that matters.
- Collaboration — We are in it together.
- Human touch — We care deeply
We are also quick to embrace new technologies: we have rapidly adopted AI internally, and we are always looking to work with people who are excited to augment their work with AI.
This role can be fully remote in the UK and EU, with occasional travel to our London or Paris offices, within +/- 2 hours of the GMT time zone. We are unfortunately not able to consider candidates located outside these locations and time zones at this stage.
What You Will Be Doing
As a senior engineer on Ecosystem Experience, you’ll own problems end to end — from partner discovery through design, implementation, rollout, and production reliability.
We expect you to operate with a high degree of autonomy and to raise the technical bar for the team.
- Lead the design and delivery of integrations that move clinical and operational data safely between Semble and external systems, including REST/GraphQL APIs, webhooks, HL7, SFTP, and iPaaS/automation flows.
- Work across the stack in our Yarn/Nx TypeScript monorepo: React on the frontend, Node.js services and domain modules on the backend, GraphQL (internal and public APIs), and MongoDB.
- Take ambiguous partner specs and product goals and turn them into clear technical designs, sequenced delivery plans, and clinically safe, testable solutions.
- Make sound architectural trade-offs — simplicity vs flexibility, build vs buy, speed vs long-term maintainability — and document the decisions so others can follow them.
- Own production outcomes: monitoring and alerting (e.g. Datadog), incident diagnosis, root-cause analysis, and durable fixes — not just shipping features.
- Improve reliability and operability: failure handling, retries, idempotency, credentials/secrets, multi-tenant config, and safe rollouts across many production environments.
- Contribute to Semble Connect and related automation — provisioning, connections, recipe/webhook patterns, and the product surfaces that expose them to practices.
- Set a high quality bar through design reviews, thorough code reviews, automated tests (unit, integration, e2e), and pragmatic CI/CD improvements.
- Mentor and unstick teammates; give clear feedback; help more junior engineers grow without becoming a bottleneck.
- Influence the Ecosystem Experience roadmap and technical standards — surfacing risks early, proposing better approaches, and aligning stakeholders when requirements conflict.
What We Are Looking For
We’re looking for a senior fullstack engineer who enjoys messy real-world integrations as much as clean product UI — someone comfortable reading a partner OpenAPI spec in the morning and shipping a resilient production path by the afternoon.
You should already be operating at a senior level: driving work independently, elevating those around you, and thinking beyond the ticket in front of you.
Must-Haves
- 5+ years' professional experience building production web applications with React and TypeScript, including substantial