Full Stack Engineer

Full-time Flexible hours Full Stack Engineer Build Flow — the governed AI platform where operators author AI Agent, design data pipelines, and run deterministic workflows. Apply now →Fontana websiteFontana docs What Flow is Agent Harness Knowledge Graph Workflow Engine Fontana Flow is an Agent Harness, Knowledge Graph, and Workflow Engine integrated as a governed AI platform for organisations with strict compliance, audit, and operational control requirements. Clients use it to author AI Agents, design data pipelines on an interactive canvas, run them on a reactive server-side engine, and layer governed AI agents on top with tools, skills, and approved model access. Every workspace is isolated; every privileged action can leave audit evidence. Engineering at Fontana We build software the AI-native way: agents write, review, and ship alongside humans. On a busy weekend we have spun up 5,000+ development agents . You will design work so fleets of agents can move fast — and so humans stay in the control path for what matters. Our Slack workspace has more Agents and AI employees than humans. We build for a future where code and contributions flow from many hands, some human, some not. ❌ Does this sound chaotic rather than exciting? This role is not for you. ✅ Sounds like the only sane way to ship in 2026? Keep reading. What you will be working on End-to-end product slices React UI → Convex backend → tests → docs. Flow UI Interactive canvas, workflow authoring, data pipeline controls, and real-time product surfaces. Knowledge Graph Operational context, lineage, file and skill surfaces, and evidence-aware data modelling. Agent Harness Agents, Skills, Tools, MCP connections, Agent Interop, approved model access, and human-in-the-loop controls. Reactive backend Real-time Convex queries, mutations, and actions with auth, RBAC, and fail-closed behaviour. Workflow engine Deterministic execution, lineage, connectors, and server-side orchestration. Our Stack You Will Be Working With The Following Technologies React 19 TypeScript Vite Tailwind Convex Zitadel Node JS Postgres Vault Airbyte Docling OpenSandbox Kubernetes K3s Docker AWS Helm Terraform Traefik Gatus HyperDX / OTLP React-flow Python Vitest Playwright …and more You'd be a strong fit if you Write strong TypeScript and modern React. Ship full-stack features across UI and typed API/data layers. Are comfortable with reactive / real-time data. Test behaviour that can actually break. Communicate clearly in writing so agents and teammates can continue your work. Comfortable using Cursor as the primary dev IDE. Already work comfortably with AI-assisted development, agent review loops, and human-controlled shipping. Can operate around DevOps, AWS, Kubernetes, and production systems without drama. Understand why compliance evidence matters: SOC 2, ISO 27001, DORA, audit trails, access control, retention. Bonus signals Convex, Firebase, or similar reactive backends. Canvas / editor / data-grid product surfaces. Workflow, ETL, or financial-ops tooling. Monorepo discipline and real AuthZ. CRDT principles. Audit trails, fail-closed paths, and evidence — not vibe-based “ship it”. SOC 2ISO 27001DORAAWSK8s Location We will review applications in location rounds, because early collaboration will be easiest with timezone and founder access close to home. First round: London applicants Second round: UK applicants Third round: EU applicants Forth round: Global applicants How we work Flexible Flexible hours. AI-first Agents and humans ship alongside each other. Low theatre Direct access to founders — no ticket theatre, no six-layer approval stack. We prefer clean architecture over hacks. Specs and docs stay in sync with the code. Apply Application form via Notion. If this sounds like the only sane way to ship in 2026, send us your details. Open application form → React 19TypeScriptViteTailwindConvexZitadelNode JSPostgresVaultAirbyteDoclingOpenSandboxKubernetesK3sDockerAWSHelmTerraformTraefikGatusHyperDX / OTLPReact-flowPythonVitestPlaywright…and more