Senior Full-Stack Engineer (Mobile apps for Banking, Trading and FinTech)

About the Position

We are seeking a Senior Full-Stack Engineer with a focus on mobile apps for banking, trading, and fintech to join our team at DevBrother. As part of a major initiative to integrate our platform's trading infrastructure into the applications and internal services of a large bank, you will be responsible for designing and developing fault-tolerant mobile trading modules and ensuring their seamless, high-load integration with both the bank’s and our platform’s server-side architectures.

Responsibilities

• Mobile & Server Integration: Develop and implement cross-platform mobile solutions (React Native) and backend services to embed our trading engine into the banking environment.
• High-Load Mobile Architecture: Ensure minimal interface response times and flawless processing of streaming quotes, charts, and orders via WebSockets on mobile clients.
• Backend Services: Build robust API gateways, data adapters, and integration layers connecting the mobile client with banking services and our core platform.
• Client Collaboration: Participate in technical sessions with the CTO, bank architects, and client engineers to align on security protocols and mobile client requirements.
• Security & Optimization: Ensure the mobile application meets strict banking security standards (encryption, biometrics, secure session management).

Requirements

• Domain Expert: Practical experience in trading, banking products, fintech, or payment solutions (understanding the nuances of transactions, authorization, and financial data).
• High-Load Mobile Experience: Expertise in handling intensive real-time event streams and maintaining strict connection stability on mobile devices.
• Confident Communicator: Comfortable speaking directly at a high technical level with CTOs and enterprise banking leads.
• Fast Learner: Capable of quickly mastering the architectural specifics of our core product with the support of our internal engineering team.
• Technical Skills:
  • Mobile Stack: Excellent command of React Native and TypeScript, with a deep understanding of iOS/Android platform specifics, native modules, and mobile rendering optimization.
  • Backend Stack: Solid backend development experience (Node.js/TypeScript or similar enterprise stacks), with proven ability to build REST/GraphQL APIs and handle WebSocket communication.
  • Infrastructure & Security: Understanding of mobile data protection principles, caching strategies, background task management, and push notifications.
• AI-Native Approach: Active, practical use of AI is a mandatory baseline requirement. We expect you to treat AI as a fundamental part of your development process:
  • Continuous work with cutting-edge tools (e.g., AI tools) to accelerate system design, code generation, refactoring, and automated testing.
  • The ability to critically verify AI outputs and leverage them to multiply the delivery speed of complex features.

Nice to Have

• Experience embedding modules (SDKs/white-label solutions) into existing large-scale mobile banking applications.
• Practical familiarity with OAuth2/mTLS authorization protocols within the banking sector.

We Offer

• Flexibility & Hubs: Flexible schedule with hubs in Kyiv, Ukraine and Wroclaw, Poland.
• Health & Wellness: Medical Insurance (Ukraine) and Multisport program (Poland).
• Time Off: Paid vacations, sick leave, and all public holidays.
• Growth: Mentorship programs, access to educational platforms, and English classes (up to 3 times a week).
• Equipment: Modern development hardware provided by the company.
• Support: Tax and accounting support for specialists in Ukraine.
• Culture & Perks: Regular team-building activities, meetups, and a transparent bonus system.

About the Company

DevBrother is a developer of scalable fintech and trading platforms, providing enterprise-grade infrastructure to global partners. We are committed to delivering high-quality, secure, and innovative solutions to our clients.

Apply Now

If you are passionate about fintech and have the required skills and experience, we would love to hear from you. Apply now to join our team and contribute to our mission of revolutionizing the trading infrastructure landscape.