Founding Engineer: Architect & Scale Fintech Platform

Infinite; San Francisco (CA); On-site; USD 130,000 - 230,000; Full time

Job summary

Infinite is looking for a Founding Engineer to define and build the technical foundation of our platform. You will join in-person to own architecture, implementation, and production reliability for mission-critical services, collaborating directly with founders and early customers to translate real-world needs into robust, high-quality products.

Responsibilities include designing end-to-end systems, handling ledgering, compliance, and risk in a scalable, low-downtime manner, and making

Qualifications

• 2–5+ years of professional software engineering experience delivering 0-to-1 products and scaling them in production.
• Proficiency in at least two of Next.js/TypeScript, C#, Go, Python.
• Hands-on experience with asynchronous and event-driven architectures.
• Full-stack ownership spanning front-end, back-end, and cloud infrastructure.

Responsibilities

• Full Stack & End-to-End – design, implement, and operate services and features from requirements to production support.
• System Design & Architecture – develop highly available, event-driven systems for ledgering, compliance, and risk with zero downtime.
• Implementation Engineering – embed with customers, collect feedback, and iterate rapidly to align roadmap with user needs.
• Technical Decision-Making – balance speed and long-term scalability, select appropriate technologies for each problem domain.

Skills

Next.js/TypeScript

C#

Go

Python

Async architecture

Full-stack ownership

Communication

AI-assisted tools

Tools

Cursor

windsurf

Job description

Infinite is looking for a Founding Engineer to define and build the technical foundation of our platform. You will join in-person to own architecture, implementation, and production reliability for mission-critical services, collaborating directly with founders and early customers to translate real-world needs into robust, high-quality products.

Responsibilities include designing end-to-end systems, handling ledgering, compliance, and risk in a scalable, low-downtime manner, and making