Full-Stack Integration Engineer: API Integrations

Sourceangel; Warszawa; Hybrid; PLN 120,000 - 180,000; Full time

Benefits offered by this job

Equipment provided

Competitive salary

Job summary

Source Angel in Warsaw is seeking an experienced Integration Engineer (Full-Stack) to join a US-based team building the next generation of enterprise real estate integrations. You will own end-to-end integrations and work with product, engineering, and external APIs to deliver reliable experiences.

You will develop full-stack features using Node.js, React, and TypeScript, with a focus on backend architecture and scalable design.

Qualifications

• Strong fundamentals in APIs, data models, databases, authentication concepts, and application architecture.
• Hands-on experience with APIs and third-party integrations.
• Full-stack experience across backend and frontend using Node.js, TypeScript, PostgreSQL, and React.
• Fluent English with 4–5 hours overlap with US Central Time.

Responsibilities

• Own the end-to-end lifecycle of integrations, from design and development to deployment and ongoing optimization.
• Build and maintain scalable integrations with third-party platforms, APIs, and external services.
• Develop full-stack features using Node.js, React, and TypeScript, with a strong focus on backend architecture.
• Partner cross-functionally with Product, Design, and Engineering to deliver seamless, user-centric integration experiences.
• Diagnose and resolve complex integration issues, ensuring high reliability and uptime.

Skills

APIs & integrations

Full-stack development

Node.js

TypeScript

React

PostgreSQL

English communication

Tools

REST APIs

CRM integrations

Webhooks

Job description

Source Angel in Warsaw is seeking an experienced Integration Engineer (Full-Stack) to join a US-based team building the next generation of enterprise real estate integrations. You will own end-to-end integrations and work with product, engineering, and external APIs to deliver reliable experiences.

You will develop full-stack features using Node.js, React, and TypeScript, with a focus on backend architecture and scalable design.