Full Stack Engineer (React Native+Node.js)

Project overview

Andersen is hiring a Full Stack Engineer (React Native+Node.js) for a project modernizing digital financial platforms and delivering secure, scalable banking, payment, and investment solutions.

Our customer is a software development and IT consulting provider specializing in customized digital solutions, with a particular focus on the financial services sector. Its expertise covers web and mobile application development, cloud solutions, system integration, software modernization, and UI/UX design. Leveraging modern technologies, including artificial intelligence and machine learning, the company helps businesses optimize operations, enhance customer experiences, and accelerate digital transformation.

The project is is focused on the development, modernization, and integration of digital financial products for banks, credit unions, investment firms, and fintech companies. The platform operates in a highly regulated environment and supports services such as digital banking, payments, lending, wealth management, and investment solutions.

Responsibilities

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Join us!

• Building and maintaining functionality in React Native SDK, including brownfield integration into partners’ host apps.
• Designing and implementing supporting BFF endpoints in Node.js and TypeScript, exposed over RPC.
• Debugging the full request path: mobile client, network, BFF, and external services.
• Reviewing other engineers’ code and providing substantive feedback.
• Taking part in production incident responses, including analyzing logs and tracing issues back to their root cause.
• Making pragmatic technical decisions in the face of changing requirements and strict regulatory constraints
• Commercial software development experience for 5-7+ years.
• Strong experience with React Native, including Expo and bare workflows, native module integration, mobile debugging, and iOS/Android integration.
• Hands-on experience with mobile SDK integration or development, including brownfield integration into existing mobile applications.
• Experience with SDK architecture, embeddable components, versioning, and backward compatibility.
• Strong TypeScript skills on both the client and server sides.
• Strong experience with Node.js BFFs and API development (NestJS, Fastify, Hono, Express).
• Hands-on knowledge of designing RPC-style APIs.
• Proven ability to independently deliver end-to-end features across React Native and Node.js backend.
• Solid SQL skills, including joins, query optimization, and materialized views.
• Experience with production troubleshooting, root cause analysis, logs, tracing, and incident response.
• Comfortable working in Git-based workflows with code review as a core practice.
• Effective use of AI coding tools (Claude Code, Cursor, GitHub Copilot) in day-to-day development, including reviewing and validating AI-generated code.
• Strong product mindset, ownership, and ability to work independently.
• Level of English – Upper-Intermediate (B2) or above.
• Experience in fintech, banking, or regulated environments.
• Familiarity with OTA update tools (Stallion, Hot Updater, CodePush, Expo Updates).
• Experience with Go.
• Experience with mobile CI/CD pipelines.
• Knowledge of JWT and application security practices.
• Advanced native iOS and Android development experience.
• Experience with React Web.
• Experience in teamwork with leaders in FinTech, Healthcare, Retail, Telecom, and others. Andersen cooperates with such businesses as Samsung, Siemens, Johnson & Johnson, BNP Paribas, Ryanair, Mercedes, TUI, Verivox, Allianz, T-Systems, etc.
• The opportunity to change the project and/or develop expertise in an interesting business domain.
• Job conditions – you can work both fully remotely and from the office or can choose a hybrid variant.
• Guarantee of professional, financial, and career growth! The company has introduced systems of mentoring and adaptation for each new employee.
• The opportunity to earn up to an additional 1,000 USD per month, depending on the level of expertise, which will be included in the annual bonus, by participating in the company's activities.
• Access to the corporate training portal, where the entire knowledge base of the company is collected and which is constantly updated.
• Bright corporate life (parties / pizza days / PlayStation / fruits / coffee / snacks / movies).
• Certification compensation (AWS, PMP, etc).
• Referral program.
• Private health insurance and sports compensation, depending on the type of employment.

Project details

• Start: flexible
• Remote: remote
• Location: Warszawa, Rondo Daszyńskiego 1, PL
• Languages: English