Miroslav Zhelezchev

Senior Java Software Engineer @A1 Telekom Austria AG

AT

Led the A1 Order-Fulfilment Microservices Transition, migrating a legacy order stack to AWS & Kubernetes with Java 17, Spring Boot 3, MySQL — delivering 50% faster releases and 99.95 % uptime. Broke a multi-million-line monolith into 30+ microservices; implemented CQRS & cutting mean checkout latency from 900 ms to < 250 ms. Built a CI/CD pipeline (GitLab CI) that reduced deployment time from 45 min to < 8 min and enabled automated blue/green releases. Introduced Kafka and for event-driven order orchestration, boosting throughput to 12 K TPS and ensuring exactly-once processing. Deployed a full observability suite (AWS CloudWatch), driving MTTR down by 35 % and achieving proactive alerting with 95 % accuracy. Managed a distributed squad; established coding standards, peer reviews, TDD and continuous security scanning, raising release quality by 40 %.

University of Economics - Varna

Bachelor's degree, Accounting and Finance