Sixtyfour Verified
Software Development, Digital Agency, IT Consulting
Software Engineer - Full-Stack
San Francisco, California, United StatesRemoteFull Time$100,000–$200,000 /yrPosted 2 months agoHidden Gem · YC Startup
Role summary
Sixtyfour is seeking a Full-Stack Software Engineer to build and evolve their data orchestration engine. The role involves developing polished UI experiences with Next.js and TypeScript, designing backend APIs with FastAPI/Python, and managing a workflow engine. Responsibilities include shipping data pipelines, deploying on AWS with Docker, and ensuring high standards for reliability, performance, and security. Experience with observability tools, databases like Postgres and Redis, and cloud deployment is essential. Nice-to-have skills include experience with specific frameworks like Prisma, tRPC, GraphQL, and testing tools like Playwright.
### **About Sixtyfour**
Sixtyfour is a data orchestration engine for company and people data. Our AI agents specialize in enriching detailed datapoints about individuals and organizations, gathering information from both public and proprietary sources. We enable enterprise customers to build custom data pipelines that help them find, enrich, qualify, and act on company-specific requirements for people and business data.
**Our Mission**
To power how enterprises understand and act on people and companies with world-class intelligence.\
\
**What you’ll 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.
* Deploy 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.
* Maintain a high bar for reliability, performance, and UX; instrument everything.
* Be very customer-focused on how certain product decisions impact end customers.
## **Minimum requirements**
* Strong backend skills in **Python** (FastAPI preferred): API design, testing, error handling, schema/versioning.
* Good design taste is a must.
* Experience deploying/operating with **Docker** and a major cloud (AWS preferred: ECS/EKS/Lambda, SQS, CloudWatch).
* 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).
* Testing: Playwright (e2e), Vitest/Jest, pytest; accessibility checks.
Sixtyfour is a data orchestration engine for company and people data. Our AI agents specialize in enriching detailed datapoints about individuals and organizations, gathering information from both public and proprietary sources. We enable enterprise customers to build custom data pipelines that help them find, enrich, qualify, and act on company-specific requirements for people and business data.
**Our Mission**
To power how enterprises understand and act on people and companies with world-class intelligence.\
\
**What you’ll 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.
* Deploy 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.
* Maintain a high bar for reliability, performance, and UX; instrument everything.
* Be very customer-focused on how certain product decisions impact end customers.
## **Minimum requirements**
* Strong backend skills in **Python** (FastAPI preferred): API design, testing, error handling, schema/versioning.
* Good design taste is a must.
* Experience deploying/operating with **Docker** and a major cloud (AWS preferred: ECS/EKS/Lambda, SQS, CloudWatch).
* 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).
* Testing: Playwright (e2e), Vitest/Jest, pytest; accessibility checks.
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