[Hiring] Senior Fullstack Software Engineer @Semble

Role Description

As a senior engineer on Ecosystem Experience, you’ll own problems end to end — from partner discovery through design, implementation, rollout, and production reliability.

• Operate with a high degree of autonomy and 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
  • 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)
  • 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.

Qualifications

• 5+ years' professional experience building production web applications with React and TypeScript, including substantial time operating as a senior / staff-of-one on complex features.
• Strong hands-on experience with Node.js backends and APIs (REST and/or GraphQL).
• Proven experience integrating with third-party systems — APIs, webhooks, auth flows, retries, idempotency, credentials/secrets.
• Ability to design systems, not just implement tickets: break down large problems, define interfaces/contracts, and leave codebases easier to change than you found them.
• Comfort working in ambiguity — clarifying requirements, challenging weak specs, and driving decisions when information is incomplete.
• A production ownership mindset: debugging complex issues across services, reading logs/metrics traces, and preventing the same incident twice.
• Solid automated testing habits (unit/integration/e2e) and comfort with CI/CD; you know when to add coverage and when not to over-engineer.
• Experience with NoSQL databases (MongoDB or similar) and cloud-hosted applications (AWS preferred).
• Strong written and verbal communication — RFCs/tech notes, partner discussions, and clear updates for Product and other engineers.
• Collaborative leadership without needing formal authority: mentoring, reviewing thoughtfully, and aligning people around a plan.
• Security and privacy awareness appropriate for handling sensitive healthcare data — least privilege, secrets hygiene, safe logging.
• Comfort using AI coding tools to accelerate delivery without lowering the quality bar.

Requirements

• Healthcare, HL7/FHIR, lab/pharmacy, or other regulated-domain integrations.
• iPaaS / automation platforms (Workato or similar).
• Design systems / component libraries, and large monorepo experience.
• Infrastructure as Code (Terraform / CDK), observability (Datadog or similar), and multi-tenant SaaS.
• Experience leading technical delivery across multiple engineers or workstreams.
• Playwright or Cypress e2e experience.
• Bilingual English–French.

Benefits

• £70,000–90,000 package, based on your experience and the value you can bring.
• Autonomy and ownership — we’ll set the vision and share the context, then we trust you to run with things.
• 36 days off: 25 holidays + bank holidays + 3 extra days (birthday and ‘feel good’ days).
• Comprehensive health & wellbeing support — including private health insurance, and mental health support and free therapy sessions through Oliva.
• Hybrid & flexible work environment — work from anywhere in the UK, with also some flexibility to work across Europe.
• Get the tech you need — latest MacBook (unless you prefer Windows) and a wide range of equipment for your home office.
• Work alongside an inspiring team — knowledgeable and innovators in their field.
• Fantastic office space in Central London, right outside Monument — with a roof terrace, weekly activities, loads of natural light, and cute doggies!
• The usual free bits coming with nice offices — barista coffee, tea, fruits, happy hours and activities.