Software Engineer

Software Engineer - Full-Stack

YC Work at a Startup

Location:
United States , San Francisco

Category:
IT - Software Development

Contract Type:
Not provided

Salary:

100000.00 - 200000.00 USD / Year

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Job Description:

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.

Job Responsibility:

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

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

Additional Information:

Job Posted:
March 04, 2026

Employment Type:

Fulltime

Work Type:

Remote work

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