Senior Software Engineer (React.js, Python)

OANDA; Kraków; Hybrid; PLN 260,000 - 420,000; Full time

Job summary

OANDA is seeking a Senior Full Stack Engineer to shape the architecture of onboarding flows using React.js and Python (FastAPI). You will own features end-to-end, integrate third-party services, and collaborate with teams globally.

The role emphasizes autonomy, modern tooling including AI assistants, and strong English communication in a hybrid setup in Kraków, Zabłocie. You’ll contribute to robust, scalable cloud-based solutions for fintech onboarding.

Qualifications

• Extensive commercial experience as a Full Stack Developer with React.js and Python (FastAPI).
• Experience with system design, clean architecture, and cloud environments.
• Proven API integrations with third-party services (identity, payments, e-sign).
• Strong testing skills with PyTest, Cypress, Playwright and CI/CD pipelines.
• Excellent English communication (C1) for cross‑functional collaboration.
• High autonomy, ownership, and mentoring abilities.
• Knowledge of Domain-Driven Design (DDD) and Infrastructure as Code (Terraform).
• Experience with modern developer tooling, including AI assistants.

Responsibilities

• Drive the architecture, design, build, and maintain onboarding forms and registration workflows using React.js and Python (FastAPI).
• Oversee third-party vendor API integrations (APIs/SDKs) and collaborate with external providers and internal teams.
• Independently own features and technical initiatives end-to-end — from design to production deployment.
• Ensure clear communication in English across cross-functional teams and stakeholders.
• Write clean, testable code adhering to SOLID and Clean Code, with strong reviews.
• Champion modern tooling (AI assistants, Claude Code) to streamline development and automation.
• Lead team technical discussions, mentor engineers, and drive system-architecture improvements.

Skills

Full stack development

React.js

Python (FastAPI)

System design

Google Cloud Platform

API integrations

Automated testing

CI/CD

English (C1)

Mentoring

DDD

IaC (Terraform)

AI tooling

Tools

PyTest

Cypress

Playwright

Terraform

Claude Code

Job description

Fancy helping to shape the future of FinTech?

We have always been innovators. In 1996 we were the first company to share exchange rate information, free of charge on the internet. Today, we are a world leading online trading group.

Join us to:

• Help build the future of online trading
• Be part of a culture driven by integrity and global impact
• Become part of an award-winning company - check out our full list of awards here.

We are only as good as our people. Luckily, our people are the best. Join us!

How do we work?

We are an international Scrum team of Full Stack Software Engineers working with React.js, Python, and Google Cloud Platform. We build and optimize registration flows and onboarding forms used by our clients for a seamless, secure onboarding experience.

We place a strong emphasis on continuous improvement, autonomy, cross-team collaboration, and clean architecture.

We work in a hybrid model in Cracow, Zabłocie.

As a Senior Full Stack Engineer, you will:

• Drive the architecture, design, build, and maintain dynamic onboarding forms and registration workflows using React.js and Python (FastAPI).
• Oversee and implement third-party vendor service integrations (APIs/SDKs), ensuring reliability, and collaborate closely with external providers and internal teams across the organization.
• Independently own features and technical initiatives end-to-end — from technical design, analysis, and problem-solving to production deployment.
• Ensure clear communication in English across cross-functional teams, technical stakeholders, and business partners, driving technical alignment and pragmatic solutions.
• Write clean, testable, and efficient code adhering to software engineering best practices (SOLID, Clean Code), championing code quality and conducting constructive code reviews.
• Champion and integrate modern developer tooling (including Claude Code and AI assistants) to streamline development, refactoring, and process automation across the team.
• Lead team technical discussions, mentor other engineers, and continuously drive improvements in our system architecture.

What skillset you need to be successful in this role:

• Extensive commercial experience as a Full Stack Developer working with React.js and Python (FastAPI).
• Demonstrated experience with system design, clean architecture, and cloud environments (preferably Google Cloud Platform).
• Proven experience with third-party vendor API integrations (e.g., identity verification, payment gateways, e-signature).
• Strong command of automated testing tools (PyTest, Cypress, Playwright) and CI/CD pipelines to ensure system reliability.
• Strong English communication skills (C1) for daily collaboration in a multicultural environment and cross-team alignment.
• High degree of autonomy, ownership, and the ability to mentor and support peers.
• Solid understanding of Domain-Driven Design (DDD) principles and Infrastructure as Code (IaC, e.g., Terraform).
• Hands‑on experience utilizing modern developer tooling, such as AI assistants and Claude Code, in everyday engineering workflows.

Bonus points if you have experience with:

• Commercial background in the FinTech industry (handling sensitive data, compliance, KYC/AML, or payment systems).
• Driving or contributing to organizational/team transformations toward AI-driven development, automated testing, and developer productivity tooling.

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At OANDA, to help us efficiently process applications, we use AI-driven tools to help source and rank candidates based on professional experience and skills. While these tools provide recommendations, our recruitment process remains human-centric: all final shortlisting and hiring decisions are made by OANDA team. You have the right to request a human review of your application.

OANDA Global Corporation is a diverse and global team with offices around the world. We value the unique skills and experiences each individual brings to OANDA. We are committed to creating and sustaining a collegial work environment in which all individuals are treated with dignity and respect and one which reflects the diversity of the community in which we operate. We provide an inclusive and accessible environment for everyone. Candidates selected for an interview will be contacted directly. If you require accommodation during the recruitment and selection process, please let us know. We will work with you to provide as seamless a recruitment experience as possible.