Sixtyfour
About us
Sixtyfour AI is a small, fast-moving team building real products for real users. We ship quickly, sweat the details, and give engineers full ownership—from idea to production.
The role We’re hiring full-stack engineer who loves taking products from
0→1
and then making them great. You’ll own features end-to-end, work closely with design and founders, and make pragmatic technical decisions that balance speed and quality. If you’ve built things outside of school/work, launched side projects, or tried something entrepreneurial, we want to talk.
What you’ll do
Build polished, fast product experiences in
Next.js + TypeScript
(accessible, responsive, design-quality UI).
Design clear backend contracts and APIs in
FastAPI/Python
for workflows, jobs, billing, and auth.
Evolve our workflow engine (DAG/state machine):
scheduling, retries/idempotency, rate limits, progress, logs, user-visible run history .
Ship data pipelines and background workers ( Celery/queues ) with strong
observability and alerting .
Scale and harden on
AWS + Docker
(ECS/EKS or similar), adding
Redis
caching, pagination, backpressure, and cost controls.
Implement features
end-to-end : DB schema → API → UI, including tests and telemetry.
Contribute to
billing (Stripe) ,
permissions/RBAC , and real-time UX ( SSE/WebSockets ) for run status.
Hold a high bar for
reliability, performance, and UX —instrument everything, measure, and iterate.
You’ll thrive here if you have
Proven ownership : you’ve shipped projects end-to-end (products, startups, open-source, freelancing, apps with users).
Strong backend Python
(FastAPI preferred): API design, testing, error handling, schema/versioning.
Cloud + containers : deployed/operated with
Docker
and a major cloud ( AWS
preferred: ECS/EKS/Lambda, SQS, CloudWatch).
Workflow/job systems
experience: queues, retries, idempotency keys, scheduling, and run histories.
Data stores : comfortable with
Postgres
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.,
OpenTelemetry, Sentry, Langfuse ) and pragmatic on-call.
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/CloudFront).
Prisma/Drizzle ;
tRPC
or
GraphQL ;
Zod/JSON Schema ; feature flags/experimentation.
Real-time UX (WebSockets/SSE), optimistic updates, background revalidation.
Celery/RQ, event sourcing, or state-machine libs (Temporal, Dagster, Prefect, XState).
Stripe
(subscriptions, metered usage, webhooks) and customer-visible billing pages.
CI/CD (GitHub Actions), IaC (Terraform), lightweight cost/perf dashboards.
Search/retrieval (OpenSearch/Elasticsearch) and simple relevance tuning.
Testing:
Playwright
(e2e),
Vitest/Jest ,
pytest ; accessibility checks.
How we work
Ownership > bureaucracy : small team, big impact.
Speed with quality : ship, measure, iterate.
Customer-obsessed : polish the details that matter.
Interview process
Quick screening call
(mutual fit + role context).
Take-home assessment
(focused, practical).
Code walkthrough
(discuss decisions, trade-offs, and improvements).
In-person paid trial week
(work with us on real problems; compensated).
What to include when you apply
A few links that show
initiative and ownership : GitHub, product pages, demos, write-ups, or anything you’ve shipped.
A short note on a 0→1 project you led:
goal → constraints → your decisions → outcome .
#J-18808-Ljbffr
The role We’re hiring full-stack engineer who loves taking products from
0→1
and then making them great. You’ll own features end-to-end, work closely with design and founders, and make pragmatic technical decisions that balance speed and quality. If you’ve built things outside of school/work, launched side projects, or tried something entrepreneurial, we want to talk.
What you’ll do
Build polished, fast product experiences in
Next.js + TypeScript
(accessible, responsive, design-quality UI).
Design clear backend contracts and APIs in
FastAPI/Python
for workflows, jobs, billing, and auth.
Evolve our workflow engine (DAG/state machine):
scheduling, retries/idempotency, rate limits, progress, logs, user-visible run history .
Ship data pipelines and background workers ( Celery/queues ) with strong
observability and alerting .
Scale and harden on
AWS + Docker
(ECS/EKS or similar), adding
Redis
caching, pagination, backpressure, and cost controls.
Implement features
end-to-end : DB schema → API → UI, including tests and telemetry.
Contribute to
billing (Stripe) ,
permissions/RBAC , and real-time UX ( SSE/WebSockets ) for run status.
Hold a high bar for
reliability, performance, and UX —instrument everything, measure, and iterate.
You’ll thrive here if you have
Proven ownership : you’ve shipped projects end-to-end (products, startups, open-source, freelancing, apps with users).
Strong backend Python
(FastAPI preferred): API design, testing, error handling, schema/versioning.
Cloud + containers : deployed/operated with
Docker
and a major cloud ( AWS
preferred: ECS/EKS/Lambda, SQS, CloudWatch).
Workflow/job systems
experience: queues, retries, idempotency keys, scheduling, and run histories.
Data stores : comfortable with
Postgres
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.,
OpenTelemetry, Sentry, Langfuse ) and pragmatic on-call.
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/CloudFront).
Prisma/Drizzle ;
tRPC
or
GraphQL ;
Zod/JSON Schema ; feature flags/experimentation.
Real-time UX (WebSockets/SSE), optimistic updates, background revalidation.
Celery/RQ, event sourcing, or state-machine libs (Temporal, Dagster, Prefect, XState).
Stripe
(subscriptions, metered usage, webhooks) and customer-visible billing pages.
CI/CD (GitHub Actions), IaC (Terraform), lightweight cost/perf dashboards.
Search/retrieval (OpenSearch/Elasticsearch) and simple relevance tuning.
Testing:
Playwright
(e2e),
Vitest/Jest ,
pytest ; accessibility checks.
How we work
Ownership > bureaucracy : small team, big impact.
Speed with quality : ship, measure, iterate.
Customer-obsessed : polish the details that matter.
Interview process
Quick screening call
(mutual fit + role context).
Take-home assessment
(focused, practical).
Code walkthrough
(discuss decisions, trade-offs, and improvements).
In-person paid trial week
(work with us on real problems; compensated).
What to include when you apply
A few links that show
initiative and ownership : GitHub, product pages, demos, write-ups, or anything you’ve shipped.
A short note on a 0→1 project you led:
goal → constraints → your decisions → outcome .
#J-18808-Ljbffr