Our client is an international financial technology company building solutions that support transaction communication, balances visibility, reporting, and integrations across multiple banking systems.

We are looking for a Backend Tech Lead to join a strategic rewrite of a core platform module. The role combines technical leadership with hands-on backend development, helping redesign a legacy component into a modern, scalable architecture.

You will work closely with product stakeholders, platform engineers, and frontend teams to design and implement reliable, high-performance backend services that integrate multiple enterprise systems.

IN SHORT:

🌍 Remote work or on-site (Wrocław, Bielsko-Biała) – your choice!

💰170 - 190 PLN/h + VAT

☑️ B2B contract

Your Daily Missions

• Lead the design and development of backend services for a core platform rewrite.

• Design scalable services responsible for transactions, balances, statements, and reporting data.

• Define API contracts and integration patterns between backend services, frontend applications, and external enterprise systems.

• Make key decisions around data modeling, search/indexing strategies, and performance optimization for million-row datasets with complex filtering, sorting, and pagination.

• Support frontend teams by ensuring API-first design and smooth integration with React applications.

• Ensure engineering quality through code reviews, architecture discussions, and mentoring other developers.

• Collaborate closely with product, frontend, and platform teams to deliver robust, production-ready systems.

The Essentials We're Seeking

• 7+ years of experience in backend or fullstack software development.

• Strong expertise in Java and Spring Boot, including designing modular backend services and REST APIs.

• Experience acting as a Tech Lead or technical owner responsible for architectural decisions.

• Solid experience designing scalable APIs and distributed systems.

• Strong understanding of data modeling in relational databases (e.g., PostgreSQL) and designing efficient query patterns.

• Practical experience with Elasticsearch (or similar search/indexing technologies) for filtering, search, and aggregation over large datasets.

• Experience designing hybrid data architectures combining multiple data sources.

• Experience working with external system integrations, including REST or GraphQL APIs.

• Familiarity with containerized environments (Docker, Kubernetes) and modern CI/CD pipelines.

• Understanding of security patterns in enterprise systems (OAuth2, OIDC, authentication and authorization flows).

• Working knowledge of React and TypeScript, enabling effective collaboration with frontend teams.

• Proven ability to break down complex architectural changes into manageable development phases.

• Experience using AI-assisted development tools (e.g., Cursor, Claude Code, or similar agentic coding tools) and openness to experimenting with AI-driven approaches to improve development efficiency and engineering workflows.

• Ability to combine hands-on engineering with technical leadership and mentoring.

Nice-to-Haves

• Experience in FinTech, banking, or enterprise integration platforms.

• Experience with large-scale transactional or reporting systems.

• Experience with GraphQL integrations.

• Experience with data migration or legacy system modernization.

• Experience designing API-first platforms.

• Familiarity with observability practices (logging, metrics, tracing).

• Understanding of database partitioning and query optimization patterns.

Reasons Why You Would Enjoy Working With Us

• We work in the latest technologies and with international clients, and our projects are polished from < to /> - learn about some of the projects we have completed.

• We organize TechTalks, meet-ups and create guilds where we exchange knowledge - you can learn a lot from your teammates.

• We have a close-knit team and we make sure to have regular integrations - we often go out to celebrate together.

• You can work remotely or choose to work from our offices in Wroclaw or Bielsko-Biala. However, we count on your openness to occasionally visit the office for team meetings or client visits, or possible occasional trips to the client's headquarters.

• You can adjust your working hours to suit your needs, starting your day between 7:00 and 10:00 am.

• You can work with great specialists in their fields who also have a sense of humor and other after-hours hobbies. It is the people who create the unique atmosphere and relaxed atmosphere at CSHARK.

• We have a flat structure - we are not a corporation and don't want to be one 🙃.

• We offer bonuses for employee referrals (from 3000 PLN to 7000 PLN).

• We organize remote English classes and provide access to the company library. You can also become an author/author of articles published on our technical blog - https://cshark.com/blog/.