Weekday AI
This role is for one of the Weekday's clients
Salary range: $150K - $190K/2.00% - 3.00%
Experience: 3+ YoE
We are seeking a highly skilled Founding Software Engineer (Full-Stack) to join our team in San Francisco, CA. This role focuses on solving the challenge of automating all the time-consuming tasks developers face outside their code editor — from deployments to performance, incidents, and bug resolution — using agentic workflows and AI.
You will work directly with two experienced co-founders: one who has led engineering efforts at scale for internal developer platforms used by thousands of engineers, and another who has successfully founded, scaled, and sold a developer-focused startup.
Key Responsibilities
- Event-Driven Backend Development: Architect a Node.js / Next.js / TypeScript and Supabase stack. Design schemas, event flows, and ingest dev tools webhooks to power a real-time personalized engineering portal.
- LLM Agentic Workflows: Build a system of AI agents, incorporating MCP, tool usage, memory, retry logic, context updates, and feedback loops.
- Agent Experience (AX): Design intuitive human-agent interaction interfaces, collaborating closely with engineers to refine productivity-focused digital co-pilots.
- System Design & Technical Strategy: Partner with leadership to define scalable technical paths, balancing rapid delivery with integration flexibility for diverse developer tools and open-source community support.
Ideal Candidate Profile
- Full-stack 0-to-1 builder with production deployment experience, particularly in rapidly shipping Next.js applications and event-driven, serverless architectures.
- Strong interest in agentic product experiences and the impact of AI on developer productivity.
- Prior experience as a founder or founding engineer who has built products from scratch that gained real users or paying customers.
- Problem-solver who thrives on tackling hard challenges with grit and persistence.
- Comfortable navigating ambiguity, prioritizing effectively, and adapting to changing circumstances.
- Excellent communication skills with a high degree of candor and openness.
- Deep commitment to supporting engineers in overcoming operational inefficiencies.
This Role is Not a Fit If You
- Are not based in the Bay Area (team will be co-located in San Francisco).
- Are unwilling to work six days a week (Sundays off).
- Are not excited about leveraging modern code-generation tools (e.g., Cursor, Windsurf, Claude Code).
- Are uncomfortable with frequent deletion/refactoring of large portions of code.
- Prefer rigid structures over dynamic, fast-changing environments.
- Avoid direct and honest feedback exchanges.
The Opportunity
- Work alongside two seasoned co-founders — one with deep experience scaling developer platforms, and another with proven success building and exiting a dev tools startup.
- Gain end-to-end startup exposure , from customer support and user interviews to events and core development.
- Become the first engineering hire at a company aiming to define the next category-leading developer platform used and paid for by leading tech companies.