Senior Software Engineer
Balance
Software Engineering
Poland
Posted on Oct 21, 2025
Senior Software Engineer
- Engineering
- Poland
- Intermediate
- Full-time
Description
About Us
We are a fintech company building the payments infrastructure powering global B2B commerce. As we continue to grow, we are looking for a Senior Engineer to be begin our First Team in Poland and play a key role in shaping the future of our technology and products.
Responsibilities
- Take involvement and ownership of all aspects of product development, from ideation through architecture to implementation, testing, and continuous deployment.
- Work closely with developers, product managers, and other stakeholders to ensure smooth integration and timely delivery of features.
- Lead the design and implementation of RESTful APIs to enable seamless integration with various internal and external systems.
- Optimize application performance to ensure low latency, high availability, and reliability.
- Participate in design and code reviews and ensure adherence to coding standards and best practices.
- Conduct thorough testing of backend components, write automated tests, and ensure high code quality and reliability.
- Identify and address bottlenecks, bugs, and performance issues within the backend infrastructure.
- Stay up-to-date with industry trends, emerging technologies, and best practices to continually improve the development process.
- Contribute to the overall technical strategy and architecture of the product.
- Drive engineering excellence across the team, setting the standard for code quality, testing, scalability, and security.
Requirements
- 5+ years of professional experience in software development with strong expertise in Node.js, React, and TypeScript.
- Strong hands-on coding skills with a passion for building scalable, reliable, and maintainable systems.
- Solid understanding of software architecture, design patterns, and modern development practices (Agile, CI/CD, DevOps).
- Experience with RESTful API design and development.
- Strong problem-solving skills and excellent communication abilities.
- Comfortable in a fast-paced, dynamic environment where priorities can shift quickly.
Nice to Have
- Experience in fintech, payments, or financial services.
- Familiarity with cloud platforms such as AWS, Azure, or GCP.
- Experience working with microservices or event-driven architectures.