Weekday

This role is for one of our clients
Location: San Francisco (On-site)
Experience: 3-10 years
Stage: Seed - Series B
Role Type: Early hire / founding engineer
Why This Role Exists
You'll design and build the systems that power the product - from APIs and data models to real-time pipelines and secure infrastructure. You'll be a core technical owner working directly with the founders.
What You'll Do
Architect backend services and distributed systems
Build scalable APIs and async workflows
Ship full-stack features when needed
Own performance, reliability, and security
Work directly with founders on technical direction
Set engineering standards and tooling
Leverage AI developer tools to accelerate delivery
What We're Looking For
Strong Python (Django/FastAPI) or Go
Solid React experience
Proven production system design
Cloud-native on AWS
Startup mindset and comfort with ambiguity
Nice to Have
Kafka / message queues
Postgres / DynamoDB
Terraform / Kubernetes
Regulated environments (healthcare / fintech)
LLM integrations, AI observability, or internal AI tooling
We may use artificial intelligence (AI) tools to support parts of the hiring process, such as reviewing applications, analyzing resumes, or assessing responses and identifying potential inconsistencies or verification signals in application materials based on available information. These tools assist our recruitment team but do not replace human judgment. Final hiring decisions are ultimately made by humans. If you would like more information about how your data is processed, please contact us.