Full Stack Developer

#23653 - Full Stack Developer

Date: 31 Aug 2026

Company:
QualityAI

Country/Region: US

Are you interested in working with the World’s leading AI-powered Quality Engineering Company? Ready to advance your career, team up with global thought leaders across industries and make a difference every day? Join us at QualityAI!

We are looking for a Full Stack Developer to join our growing team in Menlo Park, CA.

Location: Menlo Park, CA
Role: Full Stack Developer

We are seeking a strong Full-Stack / Backend Engineer to help design, build, and operate backend services and product surfaces that power internal tools and AI-driven workflows.

This role is best suited for an engineer who is highly practical, execution-oriented, and comfortable working across the stack from backend APIs and infrastructure to user-facing interfaces and mobile surfaces. The ideal candidate has strong hands‑on experience in Python and Type Script and is comfortable deploying modern systems in cloud-native environments. Experience with GenAI systems, orchestration, and production deployment pipelines is highly valuable.

Rust is a strong plus for performance‑sensitive backend work.

• Working across Phabricator, Code Hub, Tasks, Sheets and Drive; navigating fbsource; tracing a change through its diff history
• Operating hosted agent control planes — missions and scheduling, the agent-home session registry — and reconciling what they report against what is actually running locally
• Deep MCP experience — building and running servers and bridges, packaging and distributing plugins, and diagnosing tool‑registry and transport failures
• Working under agent security guardrails (ASG/SAGE) — understanding a probabilistic LLM‑judge enforcement layer, telling it apart from user authorization, and operating within it rather than around it
• Applying DSS classification — levels, ceilings, category‑versus‑level enforcement, and recognizing where clearance gates disagree between UI and API
• Running compliance QA against a written requirement set and producing peer‑comparable evidence
• Handling security and vulnerability workflows — significant severity, remediation SLOs, coordinating with VM Ops, verifying fixes
• Dogfooding and red‑teaming internal platforms — filing evidence‑backed defects against the tools you depend on

• Designing supervisor/worker systems for workers that fail routinely — lifecycle management, health checking, failure isolation, automated recovery, and coordinating concurrent workers over shared state
• Designing for non‑deterministic agent execution

• Building every layer of a system yourself — supervisor, tooling and operator UI; breadth matters more than any single language
• Writing long‑running services that manage child processes — daemon loops, scheduling, timeout budgets, cancellation, graceful shutdown, liveness detection
• Building operator consoles for at‑a‑glance triage, with as few deployment dependencies as possible
• Writing test and automation tooling where none exists — browser automation, OS‑level input APIs, screen‑state capture

• Writing protocol clients by hand — handshake, timeouts, teardown, and parsing responses that vary in shape
• Working below the library layer — Unix domain sockets, stdio transports, named pipes, local proxies, connection pooling and keep‑alive behavior
• Debugging faults that span layers — establishing whether a problem sits in the service, the transport, or the client
• Handling auth and credentials for local processes — socket‑based auth, certificate agents, token handling, and identity on shared accounts

• Owning a running agent fleet day to day — restarts, resets, cadence tuning, scheduled‑job lifecycle, and scheduling against shared or rate‑limited backends
• Managing unbounded growth — logs and stored data that accumulate until something breaks, and the retention and rotation that prevents it
• Treating observability as a deliverable — emitting machine‑readable system state and building the views that consume it
• Diagnosing systems that are degraded but still responding, and writing health checks that test…