Open to opportunities

Gergana Kostova-Boeva

@gerganakostova-boeva

Senior Java Developer specializing in event-driven microservices, performance tuning, and high-availability backend systems.

Bulgaria

Message

What I'm looking for

I’m looking to contribute to embedded, innovative teams where I can architect event-driven Java backends, improve performance and latency, and deliver high-availability systems in cloud-native environments while mentoring others.

I’m a highly accomplished Senior Java Developer with 10+ years of experience designing, developing, and optimizing complex backend systems. I’m known for delivering event-driven architecture and microservices using Core Java, Spring Boot, Hibernate, and RESTful web services—while driving measurable reliability and performance improvements.

In recent work, I helped mission-critical banking platforms reach 99.99% availability and cut latency by 98% (from 2 seconds to 20 milliseconds). I also architected resilient event-driven flows with the Transactional Outbox Pattern and DLQs, led deep backend performance tuning with JMeter stress testing and telemetry dashboards, and mentored mid-level engineers on concurrency and performance best practices.

Experience

Work history, roles, and key accomplishments

Current

Senior Software Engineer

Current

MPNG EOOD

Sep 2025 - Present (11 months)

Served as a consultant (via Intway) for Atruvia AG, supporting mission-critical banking permissions and bank-agency sourcing platforms. Led architectural refactoring, Hibernate/JPA migration for composite key generation, implemented event-driven decoupling with Transactional Outbox and DLQs, and improved endpoint latency by 98% while helping maintain 99.99% availability.

Sequence Based ID Generation Outbox Pattern Hibernate JPA Composite Keys Microservices Event Driven Architecture Transactional Outboxes Dead Letter Queues Distributed Systems JMeter Vault Abstract Factory Concurrency

Independent B2B Consultant & Architecture R&D

MPNG EOOD

Feb 2025 - Aug 2025 (6 months)

Performed advanced research and development in Kubernetes/OpenShift, producing infrastructure benchmarks that supported execution of the Atruvia contract.

Kubernetes OpenShift Benchmarking

Senior Backend Engineer & Technical Lead

MPNG EOOD

Mar 2022 - Jan 2025 (2 years 10 months)

Provided consultancy (via Wiser Technology) for DirecTV, building event-driven monitoring pipelines and improving incident response by 40%. Developed backend services with Java/Spring and REST APIs, implemented observability with Prometheus/Grafana/Graylog, and supported high-throughput processing using Spring Cloud and AWS S3.

Senior Backend Engineer

MPNG EOOD

Apr 2019 - Jul 2021 (2 years 3 months)

Contributed 20 hours per week to REWE Digital on a distributed logistics platform. Built a microservices warehouse fulfillment system using Kafka-based event-driven workflows and upgraded backend services on Java 11, Spring Boot, Hibernate, and relational databases, deployed on GCP with Kubernetes and Docker.

GCP Microservices Kafka Spring Boot Hibernate MySQL PostgreSQL REST APIs Google Cloud Platform Kubernetes Docker Monitoring

Senior Solutions Consultant

MPNG EOOD

Nov 2018 - Mar 2021 (2 years 4 months)

Worked as a parallel B2B contract consultant for Allianz GI, delivering performance tuning and data architecture modernization for mission-critical applications. Built high-precision reconciliation frameworks to maintain data integrity during migrations for 150,000+ pension accounts.

data modernization Data Reconciliation Data Integrity Data Verification Migration Engineering

Senior Software Engineer & Team Lead

DXC Technology

Aug 2016 - Oct 2018 (2 years 2 months)

Served Allianz Pension Services (AZPS) on a full-time hybrid schedule, optimizing financial operations such as portfolio rebalancing and fund switching. Led reporting modernization using Oracle 11g, iBatis, and BIRT, and mentored six engineers while reducing onboarding time by 30%.