Senior Full-Stack Engineer: React & Python for FinTech

OANDA; Kraków; Hybrid; PLN 120,000 - 180,000; Full time

Job summary

OANDA in Kraków is seeking a Senior Full Stack Engineer to join a hybrid team. You will drive architecture, build onboarding forms, and own features end-to-end with React.js and Python (FastAPI).

You will integrate third-party services, collaborate with external providers, and ensure code quality with automated tests, while mentoring peers and promoting productivity tooling in English across our global team.

Qualifications

• Extensive commercial experience as a Full Stack Developer with React.js and Python (FastAPI).
• Experience designing systems, clean architecture, and cloud environments (GCP preferred).
• Proven experience with third‑party vendor API integrations (identity verification, payments, e‑sign).
• Strong ability with automated testing tools (PyTest, Cypress, Playwright) and CI/CD.

Responsibilities

• Drive the architecture, design, build, and maintain onboarding forms and registration workflows.
• Oversee and implement third‑party service integrations with APIs/SDKs.
• Own features end-to-end from design to production deployment.
• Communicate in English across cross‑functional teams and stakeholders.
• Write clean, testable code and conduct constructive reviews.
• Champion developer tooling and AI-assisted development for productivity.
• Lead technical discussions and mentor other engineers.

Skills

React.js

Python (FastAPI)

Google Cloud Platform

System design

English (C1)

CI/CD pipelines

Third-party API integrations

Mentoring

Tools

Claude Code

AI assistants

Job description

OANDA in Kraków is seeking a Senior Full Stack Engineer to join a hybrid team. You will drive architecture, build onboarding forms, and own features end-to-end with React.js and Python (FastAPI).

You will integrate third-party services, collaborate with external providers, and ensure code quality with automated tests, while mentoring peers and promoting productivity tooling in English across our global team.