Senior Staff Full Stack Engineer

Healf; Berlin; Vor Ort; EUR 80.000 - 100.000; Vollzeit

Zusammenfassung

A progressive tech company is seeking a hands-on technical leader to drive architectural and engineering standards while leading teams in building scalable systems. The ideal candidate has deep mastery in Python, FastAPI, TypeScript, and React, and a strong background in cloud technologies like AWS. Key responsibilities include owning system design, leading projects end-to-end, and mentoring engineers. The role is open for remote candidates based in the UK/EU time zones.

Leistungen

Premium Wellhub Membership

Exclusive discounts on Healf products

Team retreats

Qualifikationen

• Deep backend mastery in Python 3.x and FastAPI.
• Strong frontend capability with TypeScript and React.
• Experience in building BFFs and edge APIs with Node.js.

Aufgaben

• Own architecture and systems design across frontend and backend.
• Lead projects from design to production without bottlenecks.
• Mentor engineers and establish engineering standards.

Kenntnisse

Python 3.x

FastAPI

TypeScript

React

Node.js

AWS

PostgreSQL

Kafka

Tools

Docker

Terraform

Pulumi

Jobbeschreibung

The Role

We're scaling rapidly across Web/Frontend and Backend/AI. To keep pace, we need a hands-on technical leader who can balance deep execution with architectural foresight. You'll bridge strategy and implementation: co-creating architecture and engineering standards with the Head of Engineering, while directly leading teams to build systems that scale sustainably—without bottlenecks.

Location: Remote — Open to candidates based anywhere in the UK/EU Time Zones.

Key Responsibilities

• Own architecture & systems design. Define high-impact decisions across frontend and backend (service boundaries, data flows, ADRs, UI composition, BFF patterns). Evolve our API and event-driven designs for scale and reliability.
• Lead execution end-to-end. Drive projects from discovery → design → implementation → production. Align scope with Product & Design, surface trade-offs early, and keep teams unblocked.
• Build excellent services. Ship robust Python/FastAPI microservices and TypeScript/React frontends (ideally Next.js). Use Node.js (Express/Fastify/NestJS) for BFFs/edge services where it fits. Back with PostgreSQL/Redis/Elasticsearch (or OpenSearch) for performance, resilience, and cost efficiency.
• Asynchronous comms at scale. Design and implement async workflows (Kafka/SNS/SQS/EventBridge), sagas/outbox, idempotency, retries, and back-pressure; champion distributed tracing and well-defined contracts.
• Infrastructure as code. Stand up and evolve AWS with Pulumi/Terraform (VPC, ECS/EKS or Lambda, API Gateway/ALB, CloudFront), manage secrets and networking, and automate CI/CD (GitHub Actions/ArgoCD). Use CDNs/edge where appropriate (e.g., CloudFront/Cloudflare/Vercel).
• Observability & Reliability. Establish SLIs/SLOs. Integrate logs/metrics/traces (OpenTelemetry, Prometheus/Grafana/Datadog/Sentry). Add frontend observability (RUM, error tracking, Core Web Vitals), and drive actionable alerts and incident reviews.
• Security & Governance. Apply AWS Well-Architected, least-privilege IAM, secret management, SDLC controls, and OWASP-aware web security (CSP, CSRF, SSRF mitigations). Partner on data/privacy (e.g., GDPR).
• Mentor & Uplift. Lead through design walkthroughs, pairing, and code reviews across frontend and backend. Help engineers level up and take on bigger problems.
• Greenfield & Modernisation. Lay foundations for new domains (mobile backend, new verticals) while improving existing systems (performance, reliability, cost). Guide migrations (e.g., to RSC/Next.js App Router, typed APIs).
• Team Leadership. Set engineering standards, facilitate technical planning, coordinate across squads, and influence hiring/interviews. Provide calm, decisive technical leadership.
• Cross-functionally. Turn business goals into pragmatic technical plans; communicate trade-offs clearly to non-engineers.

Qualifications

• Deep Backend Mastery: Python 3.x, FastAPI/Flask; SQL schema design & query performance; caching strategies; robust testing (pytest, property-based, integration).
• Frontend Capability: Strong TypeScript/React (Next.js preferred), component architecture, state/data fetching (TanStack Query), forms, accessibility (WCAG 2.1), performance (Lighthouse, Web Vitals), and SSR/SSG/ISR.
• Node.js experience: Building BFFs/edge APIs with Express/Fastify/NestJS; API design (REST/JSON; bonus for GraphQL/gRPC); familiarity with tRPC a plus.
• Modern Microservices: Event-driven patterns, resilience (circuit breakers, bulkheads, timeouts), contract testing, and API versioning.
• Cloud & IaC: Strong AWS (networking, compute, storage, security). Production Pulumi and/or Terraform. Containers (Docker) and orchestration (ECS/EKS) or serverless where it fits.
• Data & Search: PostgreSQL at scale; working knowledge of Elasticsearch/OpenSearch (indexing, relevance, aggregations).
• Observability Culture: You've stood up tracing/metrics/logging from scratch and used them to drive reliability—both backend and frontend.
• Leadership through Craft: Excellent taste in code, clear docs/ADRs, and steady decision-making. Proven mentorship and leading multi-team initiatives.
• Bias for Delivery: You break down complexity, make smart trade-offs, and ship.

Nice to Have (Not Required):

• Design systems (Storybook), Tailwind/Chakra, advanced forms (React Hook Form/Zod).
• GraphQL (schema design, federation), tRPC, Prisma/SQLAlchemy.
• Vector search/retrieval, ML-adjacent pipelines, feature flags/experimentation.
• WebSockets/WebRTC, background jobs/cron orchestration.
• Performance profiling (backend & frontend), cost-aware architecture.
• Experience with LangChain/agents—useful, but optional.

Why Join Healf

• Do your life’s best work: Build something that matters, with a team that moves fast and aims high
• Surround yourself with A+ talent: You’ll work with high-performers who care deeply and raise the standard every day
• Be a builder: This isn’t a cog-in-the-machine role. You’ll help shape our voice, culture, and growth
• Wellbeing is the lifestyle: From office yoga to Healf Zone insights, everything we do is rooted in our pillars: EAT MOVE MIND SLEEP
• Premium Wellhub Membership: Unlimited entry to 1000's of gym, yoga, & fitness studios (UK Only)
• Exclusive Healf Perks: 50% off all Healf products plus discounted Healf Zone blood testing.
• Nest Pension: Secure your future with our pension contributions. (UK Only)
• Wellbeing-Focused Workspace: Incredible Hammersmith office with great natural lighting (Optional Workspace if UK-Based)
• Team Connection: Annual company-wide retreat to recharge and bond.