Founding Backend Engineer – Fintech APIs, NYC Onsite 4 Days

Open Systems Technologies; New York (NY); On-site; USD 180,000 - 230,000; Full time

Benefits offered by this job

Equity

Job summary

Open Systems Technologies is seeking a Backend Founding Engineer to join a fast-growing startup in New York City. The role requires 4 days onsite in NYC and a track record of startup experience.

Compensation is $180-230k plus equity, with a strong emphasis on independent ownership and hands-on backend development. The candidate will design databases and APIs, implement features, and provide reliable estimates while communicating progress and risks.

Qualifications

• 5+ years of Node.js experience.
• 2+ years with Express.js.
• APIs development with 5+ years, fintech focus 1+.
• PostgreSQL database experience 2+.
• Architectural design experience 2+.
• Fintech web applications 1+ years.
• Early-stage startup experience essential.
• Strong collaboration and stakeholder communication.
• Bold, proactive problem solving and time management.

Responsibilities

• Independently communicate with Customer Support to investigate and resolve customer-reported issues
• Design database schemas and APIs for small-to-medium scoped features
• Implement features following internal engineering principles and guidelines
• Provide estimates for their own work and communicate progress and risks proactively to the team

Skills

Node.js

Express.js

APIs

Fintech APIs

PostgreSQL

Architecture

Fintech web apps

Startup collaboration

Time management

Job description

Open Systems Technologies is seeking a Backend Founding Engineer to join a fast-growing startup in New York City. The role requires 4 days onsite in NYC and a track record of startup experience.

Compensation is $180-230k plus equity, with a strong emphasis on independent ownership and hands-on backend development. The candidate will design databases and APIs, implement features, and provide reliable estimates while communicating progress and risks.