Founding Software Engineer (Full-Stack)

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.