Founding Software Engineer - Backend

San Franciscofull time

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On Site

$125k–$300k

H1B: no

Hypercubic The Founding Software Engineer - Backend at Hypercubic designs, prototypes, and productionizes AI-powered backend systems for mainframe modernization. This founding role involves ownership over architecture, product direction, and engineering culture working closely with the CTO.

Responsibilities

We’re looking for a backend engineer with unusually strong engineering and design taste. You will work directly with the CTO to design, prototype, and productionize AI-powered systems from first principles. This is a founding role with meaningful ownership over architecture, product direction, and engineering culture. It is suited for someone with strong fundamentals and comfortable operating across abstraction layers, from low-level system reasoning to high-level interactions.
Rapidly prototype new concepts and features to validate ideas before full implementation.
Ship AI-driven features end to end, from model interaction to user-facing workflows.
Set early engineering standards around testing, reliability, and code quality.
Translate ambiguous problem statements into concrete experiments, constraints, and working systems.
Lead architecture decisions and long-term technical direction with the CTO.
Collaborate with a highly diverse group of subject matter experts and customers from various industries (banks, insurance, airlines, and more).
You are a Fit if...
You care deeply about your work and the product.
You are comfortable with uncertainty and enjoy figuring out what to build before how to build it.

Qualification

You think in systems and feedback loopsYou can move fast and slowStrong testing intuitionLocation

Required

You think in systems and feedback loops, not just features.
You can move fast and slow. Prototyping ideas in hours, then building enterprise-grade features to a high-quality bar.
You want to become world-class at AI engineering.

Preferred

Strong testing intuition, including TDD and property-based testing.
Experience building and maintaining production-grade agentic or autonomous systems.
Exposure to legacy systems (especially mainframes or COBOL), compilers, program analysis techniques, or high-performance computing (HPC).
Familiarity with enterprise software constraints.
Location: This role is in-person based in San Francisco, California.

Benefits

Dental
Vision
401(k)
PTO
Equity/RSU
Life Insurance
Wellness

Company

Hypercubic

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Source: ashby

Active within the past hour

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Must-Have Skills for This Role

Backend EngineeringAI SystemsPrototypingTestingReliabilityCode Quality

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