Principal Developer · Cloud-native microservices · FinTech & Enterprise Systems
Architecting secure, fault-tolerant distributed systems and driving engineering excellence across the full product lifecycle.

Principal Developer with 6+ years of progressive experience delivering scalable, cloud-native microservices for FinTech and large enterprise systems. Proven track record designing end-to-end platforms, mentoring teams, and improving engineering quality (92%+ SonarQube compliance). Passionate about digital identity, privacy, and decentralized protocols.

• 🏗️ System architecture & microservices: Spring Boot (2.x/3.x), Spring, Hibernate, Spring Data JPA
• ☕ Modern Java: Java 8 / 11 / 17 / 21 (streams, CompletableFuture, records, modules)
• ☁️ Cloud & Containers: Azure, AWS (EC2, S3, Secrets), AKS/EKS, Docker, Key Vault
• 🛰️ Data & streaming: Kafka (Avro), MongoDB, MySQL, Redis, GridFS
• ✅ DevOps & quality: CI/CD (Jenkins, GitHub Actions), SonarQube (92%+ compliance), Dynatrace, Splunk
• 🧪 Testing & practices: JUnit5, Mockito, TDD/BDD, code reviews, design patterns

• 🔁 Led migration of a legacy C++ monolith to a cloud-native, event-driven Spring Boot microservices platform — improved scalability and substantially reduced technical debt.
• ⚡ Designed Kafka-based streaming for real-time processing, handling 1M+ customer records/month and enabling robust, low-latency business flows.
• 🛠️ Architected AKS-based auto-scaling deployments with mature CI/CD enabling 99.9% uptime and zero-downtime releases.
• 🧹 Enforced DevOps and code governance to achieve and sustain 92%+ SonarQube compliance; reduced critical defects by 35% in under three months.
• 👥 Mentored 4+ engineers and drove a 20% improvement in PR merge success and overall engineering throughput.

• 🗺️ Define technical roadmaps aligned to product goals and SLAs; translate requirements into measurable engineering outcomes.
• 🔎 Prioritize observability and resilience: tracing, metrics, alerting, and automated health checks.
• 🧰 Advocate engineering hygiene via CI/CD, automated quality gates (Sonar), test automation, and rigorous code reviews.
• 🧩 Prefer incremental, telemetry-driven improvements and focused refactors over large, risky rewrites.

Event-driven microservices + Kafka (Avro) for reliable streaming, Spring Boot for business logic, MongoDB/MySQL for persistence, AKS/EKS for orchestration, CI/CD with automated quality gates. 🏷️

• ☕ Java (8/11/17/21) • 🌱 Spring Boot (2.x/3.x) • 🔁 Kafka (Avro)
• 🍃 MongoDB • 🐬 MySQL • 🧠 Redis • 🗂️ GridFS
• 🐳 Docker • ☸️ Kubernetes (AKS/EKS) • ☁️ Azure • 🔐 AWS (S3, Secrets)
• ⚙️ Jenkins • 🔁 GitHub Actions • 🧭 SonarQube • 🧪 JUnit5 • 🧩 Mockito • 📊 Dynatrace • 🔎 Splunk

• E-commerce-microservices
  Spring Boot Microservices E-commerce backend with Eureka Discovery, API Gateway, Circuit Breakers, and H2 databases.

• ✉️ Email: [email protected]
• 🔗 LinkedIn: Durgesh Kumar
• 💼 Open to: mentoring, contracting, technical leadership, and collaboration on privacy / decentralized identity projects