Senior Software Engineer (Frontend)

STS S.A. is the largest Polish bookmaker operating in several European markets. Founded in 1997, it has offices in Katowice, Warsaw, and Prague and employs nearly 1500 people. The company provides services via an online platform, mobile versions, and dedicated Android and iOS applications. STS developed its own payment system STSpay and offers STS TV streaming of major sports events. It also operates a nationwide network of modern physical locations and is a major private sponsor of Polish sports, including the national football team and various sports clubs.

• Minimum 5 years of experience in web application development
• Strong knowledge of JavaScript and TypeScript
• Experience with modern frontend frameworks (e.g., React, Angular, Vue)
• Experience designing scalable frontend architectures
• Knowledge of HTML5, CSS3, and responsive design principles (RWD)
• Experience with version control systems (Git)
• Familiarity with backend communication protocols (REST API, Websocket, gRPC)
• Ability to write clean, production-quality code
• Experience working with production applications including deployment, monitoring, and maintenance

• Independently execute tasks from analysis through implementation and maintenance
• Ensure quality, performance, and availability of applications
• Diagnose and resolve issues such as performance problems
• Maintain code clarity and modularity
• Analyze systems and data flow between components
• Understand dependencies between system elements
• Translate business requirements into technical solutions
• Organize work effectively and prioritize tasks
• Share knowledge and support the team
• Actively participate in application architecture development
• Communicate effectively and collaborate within the team
• Engage in the full product lifecycle

The data controller for personal data is STS S.A., ul. Porcelanowa 8, 40-246 Katowice, registered under KRS 0000829716. Personal data processing is based on consent and legal provisions for recruitment purposes. Consent is voluntary and can be withdrawn at any time. Data is stored for the duration of recruitment or up to 24 months for future recruitment consent. Data may be shared with service providers within the European Economic Area. Candidates have rights to access, rectify, delete, restrict processing, object, and data portability. Complaints can be filed with the President of the Personal Data Protection Office. Contact details for data protection officer are provided.