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Java Tech Lead

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Cshark

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Location:
Poland , Wrocław ▼

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Category:
IT - Software Development

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Contract Type:
B2B

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Salary:

170.00 - 190.00 PLN / Hour
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Job Description:

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.

Job Responsibility:

  • 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

Requirements:

  • 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 have:

  • 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
What we offer:
  • 100% remote work
  • Flexible hours
  • International projects
  • Business english lessons
  • Participation in charity actions
  • In-house technology workshops

Additional Information:

Job Posted:
March 13, 2026

Employment Type:
Fulltime
Work Type:
Remote work
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