Kotlin/Java Developer (Merchant Response)

Job Responsibilities

• Developing new payment features and services
• Processing and resolving requests from technical support and users as part of daily duties
• Designing and implementing APIs (external and internal)
• Creating and maintaining processes in Camunda
• Participating in the design and development of high-load system architectures
• Supporting and enhancing existing solutions and services
• Writing high-quality, test-covered code (unit tests, integration tests)
• Conducting code reviews
• Optimizing system performance and database queries
• Analyzing and resolving production incidents and bugs
• Analyzing documentation from external providers, conducting quick checks, and defining epics and tasks based on Proof of Concept
• Collaborating with the QA team to ensure the high quality of the delivered product
• Maintaining technical documentation and writing technical specifications
• Assisting in onboarding new developers and ensuring code quality
• Definition and formation of technical epics — analyzing existing solutions, identifying opportunities to improve system architecture, performance, and reliability, preparing improvement proposals, and aligning them with the team lead and architect
• Participation in the creation of business epics — analyzing requirements, assessing feasibility, and proposing alternative or optimized solutions based on technical expertise
• Collaborating with analysts and product managers to determine the best implementation approach
• Preparing tasks based on approved epics, ensuring proper detailing and alignment with architectural and business requirements
• Estimating task completion timelines, participating in sprint planning, and providing accurate technical time and effort estimates

Important and Challenging Tasks

• Creating and developing reliable payment solutions with high security and performance levels
• Processing and resolving requests from technical support and users as part of daily duties
• Optimizing the performance and scalability of payment systems
• Integrating complex external providers
• Participating in ensuring system compliance with high-security requirements (PCI DSS and others)