Relixir · 3 months ago
Founding Engineer (Full-stack)
San Francisco, CA, US
Full-time
Onsite
Entry, Mid Level
$200K/yr - $250K/yr
1+ years expRelixir is a YC-backed startup focused on building AI-driven solutions. They are seeking a Founding Full Stack Engineer to shape the product and technology, working hands-on in both frontend and backend development while collaborating closely with the founders.
AdvertisingArtificial Intelligence (AI)MarketingSEO
No H1B
Responsibilities
Architect and ship core product surfaces with Next.js + Typescript
Design and implement high quality user experiences for complex state / data patterns
Deliver fast and clear data visualizations for millions of data points from various sources
Building features in Python (FastAPI) with PostgreSQL as our primary database
Managing AWS infrastructure — primarily ECS/Fargate, Lambda, S3, and related services
Designing APIs for the frontend (TypeScript) and partner integrations
Working on AI (LLM-powered) features end-to-end
Work directly with the founders to influence technical and product direction, deciding how we scale our platform and what bets we make in AI search automation
Take ideas from rough concepts to production-ready systems – UI/UX, frontend components, APIs, LLM usage, and everything in between
Talk to customers, dig into their needs, and turn feedback into technical solutions that directly impact their growth
Qualification
Required
In-person SF
High-agency
1-3+ years of experience building frontend & backend software for VC-backed startups
Leveraged LLMs for building critical product features
Strong proficiency in Next.js, Typescript, and Python
Have completed at least one 0 -> 1 journey of a functional product
Preferred
Entrepreneurial Mindset: Ex-founder or future founder
AWS Infrastructure Management
Timescaledb or any OLAP experience
Qdrant/RAG, LangChain/LLM tooling, prompt/eval experience
Company
Relixir
Relixir is AI Generative Engine Optimization (GEO) assistant that maps, monitors and improves AI search rankings.
2-10 employees
Funding
Current Stage
Early StageTotal Funding
$2.5MKey Investors
Y CombinatorY Combinator,z21 Ventures
2025-11-11Seed· $2M
2025-05-13Seed· $0.5M
Leadership Team
Sean Dorje
Co-Founder & CEO
Dennis Zax
CTO
Recent News
Sourcery
2025-11-21
thesaasnews.com
2025-11-12
Company data provided by crunchbase