I

Founding Software Engineer

inventure • United States
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Founding engineer at an SF startup building agentic AI to modernize legacy mainframe/COBOL systems for large enterprises. Own architecture, product direction, and engineering culture while shipping AI-driven features end to end on a small team. Requires 2+ years building, production agentic/LLM or infrastructure experience, and strong fundamentals in Java, Python, or Go.

Key Highlights
Third founding engineer reporting to the CTO on a team of about seven
90% building, 10% frontier techniques; end-to-end AI features and legacy codebase modernization
Onsite San Francisco, five days a week, with relocation support
About one third of the role is client-facing with banks and insurers
$150K–$300K base plus 0.5–2% equity; open to visa transfers (OPT, H-1B), no new sponsorship
Key Responsibilities
Ship AI-driven features end to end
Build agentic systems that modernise legacy codebases
Re-architect high-QPS data pipelines and core infrastructure
Own architecture, product direction, and engineering culture
Client-facing work with banks and insurers using the product
Technical Skills Required
Java Python Go
Benefits & Perks
Relocation support
0.5–2% equity
Nice to Have
Rust
Compilers, program analysis, or low-level/assembly experience
Time at a strong Series A+ startup or top tech company
Top-50 CS or STEM degree
A concrete exceptional project or 0-to-1 product built

Job Description

Founding Software Engineer | San Francisco (onsite) | $150K–$300K + 0.5–2% equity

About 75% of the Fortune 500 still runs on mainframes, much of it COBOL written in the 1970s and 80s that almost nobody left fully understands. An SF startup is building agentic AI that reads, reasons about and rebuilds those systems, and I’m helping them hire their third founding engineer.

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