Senior Full-Stack Engineer (Mobile apps for Banking, Trading and FinTech)
Our client is a developer of scalable fintech and trading platforms, providing enterprise-grade infrastructure to global partners. As part of a major initiative to integrate our platform's trading infrastructure into the applications and internal services of a large bank, we are opening a position for a Senior Full-Stack Engineer (Mobile & Backend focus). The core challenge of this role is 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.
What You'll Do
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).
AI-Native Approach (Strict Requirement)
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 (Claude, Cursor, Copilot, agentic scripts) 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.
Who You Are
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.
Qualifications
English: Upper-Intermediate or Fluent (strong verbal and written skills for daily client communication).
Experience: 5+ years of commercial development experience, balancing mobile and backend responsibilities.
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.
Bonus Points:
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 Ukraine and Poland (Wroclaw).
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.
CONTACT US
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