Redon – Java, Kotlin, Spring

A large-scale Product Information Management platform for managing complex product data across multiple systems and channels. The platform supports consistent product information across eCommerce, pricing, logistics, and other downstream systems.

• Designed and implemented Kotlin / Spring Boot services for product, variant, and attribute management;
• Built and maintained high-volume data export and synchronization pipelines;
• Ensured data consistency and integrity across downstream systems (eCommerce, pricing, logistics);
• Optimized performance for large datasets and batch processes;
• Integrated with external systems via REST APIs and event-driven messaging;
• Supported legacy components while incrementally modernizing the platform;
• Wrote tests, reviewed code, and contributed to architectural decisions.

A large-scale SaaS platform providing web-based functionality through Java-based REST APIs and a React frontend. The platform supported ongoing modernization and migration of legacy systems while maintaining scalability and long-term maintainability.

• Designed and delivered Java / Spring Boot backends for SaaS, ERP, and enterprise systems;
• Led integration-heavy projects involving REST APIs, third-party systems, and data synchronization;
• Translated business and product requirements into technical architecture;
• Took ownership of legacy system modernization without disrupting production;
• Ensured data correctness, security, and performance in high-impact systems;
• Mentored developers, reviewed code, and improved overall engineering quality;
• Worked closely with product, design, QA, and business stakeholders to deliver end-to-end solutions.

A digital banking platform integrated directly with real banks, enabling users to open and manage accounts, transfer money, pay bills, and track transactions through a single online application. The platform provided digital alternatives to traditional branch services, with a focus on secure, fast, and reliable financial operations.

• Developed core banking features including account management, fund transfers, bill payments, and transaction history;
• Integrated the platform with partner banks' APIs to process transactions securely in real time;
• Built user onboarding flows with KYC verification and identity checks;
• Implemented secure authentication, including two-factor authentication;
• Developed back-end services and REST APIs for financial operations;
• Ensured data security through encryption and compliance with banking regulations;
• Optimized application performance to handle high transaction volumes;
• Debugged and resolved production issues affecting payments and account operations;
• Wrote unit, integration, and E2E tests to ensure reliability of financial workflows;
• Collaborated with product, QA, and bank partner teams to deliver new features on schedule.

A self-service mobile app for telecom customers to manage their accounts on the go, including real-time data, call and SMS usage, billing, prepaid top-ups, tariffs, add-ons, and customer support. The platform integrates with internal billing and customer systems to provide millions of consumer customers with account management and service functionality through a single app.

• Developed backend services and REST APIs using Java and Spring Boot;
• Implemented core app features such as usage tracking, bill viewing and payments, and tariff management;
• Designed and optimized Oracle DB schemas, queries, and stored procedures;
• Integrated with internal billing, CRM, and payment systems;
• Managed builds and dependencies with Maven;
• Collaborated with mobile teams to define and document API contracts;
• Improved API performance and reliability through query tuning and caching;
• Debugged and resolved production issues;
• Wrote unit and integration tests using JUnit and Mockito;
• Participated in code reviews and Agile ceremonies.