Senior Software Engineer

About Us

Wallester is a cutting-edge financial technology company that specializes in providing innovative solutions for businesses seeking to modernize their payment systems. By offering white-label card issuance platforms, seamless integration with existing infrastructure, and comprehensive support for both digital and physical cards, Wallester empowers companies to enhance their financial services and customer experience. Recognized as a leader in the FinTech space, Wallester has earned a reputation for its state-of-the-art technology, security, and scalability. Whether you are a startup or an established enterprise, Wallester delivers flexible, reliable solutions tailored to meet the evolving needs of the digital economy.

Key Responsibilities:

As a Senior Software Engineer at Wallester AS, you will play a key role in developing and maintaining our unique platform that enables our clients to launch their card programs in no time. You will be involved in all stages of the software development life cycle, from planning and analysis to deployment and maintenance. You will also have the opportunity to work with cutting-edge technologies and a talented team of professionals.

• Participate in the full software development life cycle, from design and development to deployment and maintenance.
• Design, build, and maintain the architecture of the software platform, ensuring scalability, reliability, and performance.
• Collaborate with engineers across the company to design and deliver new features and technical solutions.
• Promote software engineering best practices, continuously improve development processes, and contribute to a strong engineering culture.
  

Requirements:

• 5+ years of experience in software development using any OOP language (C# / Java / PHP / JavaScript / etc.)
• Experience with microservice architecture, REST API, RPC, PostgreSQL, and Docker
• You have good English and communication skills
• Experience working with agile software development teams
• Problem-solving skills and ability to work in a fast-paced environment
• Ability to work independently and proactively.
• Experience in working with cloud platforms (Azure / GCP / AWS).
• Hands-on experience using AI coding tools such as Codex or Claude Code in real software projects, including implementation, debugging, refactoring, and testing.
• Ability to critically review and validate AI-generated code, taking ownership of its correctness, security, maintainability, and test coverage.
  

Nice to have:

• Knowledge of CI/CD best practices and technologies for software engineering and delivery
• Experience in test methodologies and frameworks
• Experience in financial software development
• Knowledge of security best practices and standards (OWASP, PCI DSS)
• Experience adapting AI coding tools to team workflows through repository instructions, reusable skills, tool integrations, and automated checks.
• Also, a spark in the eyes is always a plus!

We offer

• Competitive salary
• Career opportunities
• Medical Insurance upon the completion of the probationary period
• Supportive and caring Leadership
• A modern office in the center of Tallinn
• A chance to work as part of a highly motivated and talented team
• Referral program
• Stebby
• Company Events
• Free parking

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