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Founding Engineer Full-Stack

Founding Engineer Full-Stack

SixtyfourSan Francisco, CA, United States
17 hours ago
Job type
  • Full-time
Job description

What youll do

  • Build polished, fast product experiences in Next.js + TypeScript (design-quality UI, accessible components, responsive layouts).
  • Design clean backend contracts and APIs ( FastAPI / Python ) for workflows, jobs, billing, and auth.
  • Evolve our workflow engine (DAG / state machine) : scheduling, retries / idempotency, rate limits, progress tracking, logs, and user-visible run history.
  • Ship data pipelines and background workers (Celery / queues), with strong observability and alerting.
  • Scale and harden the stack on AWS + Docker (ECS / EKS or similar), with caching (Redis), pagination, backpressure, and cost controls.
  • Implement product features end-to-end : DB schema ? API ? UI, including tests and telemetry.
  • Contribute to billing (Stripe), permissions / RBAC, and realtime UX (SSE / WebSockets) for run status.
  • Maintain a high bar for reliability, performance, and UX; instrument everything.

Minimum requirements

  • Strong backend skills in Python (FastAPI preferred) : API design, testing, error handling, schema / versioning.
  • Experience deploying / operating with Docker and a major cloud (AWS preferred : ECS / EKS / Lambda, SQS, CloudWatch).
  • Proven work on workflow / job systems : queues, retries, idempotency keys, scheduling, and run histories.
  • Comfortable with Postgres (or MySQL) schema design and Redis (caching, rate limiting, locks).
  • Performance mindset : RSC / Server Actions, data-fetching patterns, bundle / TTFB tuning, DB query perf.
  • Production observability : logs, traces, metrics (e.g., Langfuse, OpenTelemetry, Sentry), and on-call pragmatism.
  • Solid security hygiene (PII handling, secrets, JWT / session auth, CSRF / CORS, least-privilege access).

    • Nice to have

  • Next.js App Router, RSC, Server Actions , edge / runtime primitives (Vercel / AWS CloudFront).
  • Prisma / Drizzle ; tRPC or GraphQL ; Zod / JSON schema; feature flags / experimentation.
  • Realtime UX (WebSockets / SSE), optimistic updates, background revalidation.
  • Celery / RQ , event sourcing, or state-machine libs (e.g., Temporal, Dagster, Prefect, XState).
  • Stripe (subscriptions, metered usage, webhooks) and customer-visible billing pages.
  • CI / CD (GitHub Actions), IaC (Terraform), and basic cost / perf dashboards.
  • Search / retrieval familiarity (OpenSearch / Elasticsearch) and simple relevance tuning.
  • Testing : Playwright (e2e), Vitest / Jest, pytest; accessibility checks.

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    Founding Engineer • San Francisco, CA, United States

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