Overview
Founding Software Engineer Jobs in San Francisco, CA at Weekday (YC W21)
Title: Founding Software Engineer
Company: Weekday (YC W21)
Location: San Francisco, CA
Location: San Francisco / Hybrid / On-site
Experience: 3–10 years
Stage: Seed → Series B
Role Type: Early hire / founding engineer
Compensation: $150k to $300k
Full time position
This role is for a client of Weekday
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
Requirements
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