Junior Java Engineer

Location: Poland

Department: Binance Team

Company Overview
Our client is a leading, fully regulated US-based digital asset trading platform. They provide secure, low-latency access to cryptocurrency markets, acting as a bridge between traditional finance and the Web3 ecosystem.

About This Role

You will be a part of the Engineering team and reports to our Manager, Engineering. You will support the development of backend services and APIs that power customer’s products. Working under close guidance from experienced engineers, you will gain hands-on experience contributing to real-world systems while learning best practices in software development, scalability, and security.

Key Responsibilities

• Support the development of backend services and APIs under direct supervision of senior engineers
• Assist with writing clean, maintainable, and well-documented code following team standards
• Help debug, test, and troubleshoot backend systems and services
• Contribute to small tasks or components within larger projects
• Collaborate with cross-functional teams including Frontend, Product, and DevOps
• Participate in code reviews and apply feedback to improve technical skills
• Assist in writing unit tests and validating functionality
• Document technical processes and development work

Required Qualifications

• Bachelor's degree in Computer Science or a related field; Currently pursuing is also an option
• Strong theoretical knowledge of Java, at least 0.5 years of experience 
• Practical experience building and consuming RESTful APIs — HTTP methods, status codes, JSON, request/response handling, basic error handling.
• Working knowledge of databases — has written real SQL queries (SELECT, JOIN, WHERE, GROUP BY) or used an ORM in production code; understands the difference between SQL and NoSQL at a basic level.
• Solid understanding of data structures and algorithms — arrays, hash maps, trees, basic Big-O analysis — sufficient to discuss simple coding problems and reason about correctness.
• Comfortable with Git in a team setting — branching, pull requests, code review, addressing feedback, resolving merge conflicts; has worked in a shared repository with at least one other developer.
• Hands-on experience writing unit tests for their own code (pytest, JUnit, Jest, or equivalent), and basic familiarity with how testing fits into a CI pipeline.
• Demonstrated ability to ship code to production — even small features or bug fixes — through a real review and deployment process; ability to clearly describe what they built, how it was reviewed, and how it was tested.
• Genuine interest in cryptocurrency, blockchain, or Web3 (self-taught is fine — owning crypto, reading, side projects, hackathons) and willingness to learn the regulated FinTech context;
• English level: Upper-intermediate or higher, sufficient for daily team communication and code review discussions.

Bonus: exposure to Linux / command line, Docker basics, message queues (Kafka, RabbitMQ), cloud platforms (AWS, GCP), open-source contributions, hackathon participation, or an active public GitHub portfolio.