Leonid Lunic

Background

About Leonid Lunic

I’m a Software Engineer with a deep and diverse background in building business and commercial applications across a range of industries. My journey spans everything from revitalizing legacy systems to architecting modern, cloud-native solutions, all with a focus on scalability, maintainability, and delivering real impact. My experience is broad but grounded, shaped by hands-on work across the entire software stack. In recent years, I’ve contributed to systems involving everything from messaging queues and APIs to big data pipelines and machine learning models. I keep things practical, push for simplicity, and aim to ship value fast. Tech Stack & Expertise: Programming Languages: TypeScript / JavaScript / Node.js, Java / JEE / Spring Boot, Scala, COBOL, C#, Python, SQL, bash/shell scripting, Groovy, Objective-C, Swift, Kotlin, Visual Basic (VBA), Perl, HTML / CSS Dev Tools & Platforms: Docker, Kubernetes, Jenkins, GitLab CI/CD, Cloud Foundry, Google App Engine, Heroku, JMeter, JProfiler, Burp Suite, Meilisearch, OpenCV, Cocos2d, Meta Llama LLM Databases: PostgreSQL, MySQL, MongoDB, OrientDB, MS SQL, DB2, Oracle DB, Neo4j, Redis Integrations & Messaging: IBM MQ, ActiveMQ, Apache Camel, MuleSoft, REST / SOAP, OAuth, JWT Frameworks & Libraries: NestJS, Express.js, TypeORM, JEE (Servlets, JSP, JSF, JMS, EJB, JPA, etc.), Spring, Hibernate, Struts, Akka, Spray, Apache Spark, Hadoop, Jasper Reports, JUnit, Angular, React, React Native, Ionic, Tailwind, RabbitMQ Other Areas of Expertise: Software Design & Architecture: OOD, OOP, SOLID, Microservices, Multithreading, SOA Cloud & DevOps: AWS, Azure, Google Cloud, Firebase, Digital Ocean, Hetzner, Cloudflare, OpenStack, OVH Security & Testing: Security Testing, Penetration Testing, Agile/Scrum Development Machine Learning & Data Science: PyTorch, pandas, numpy, matplotlib Always learning, always exploring. Whether it’s improving a legacy codebase, optimizing cloud infrastructure, or experimenting with AI, I’m passionate about solving complex challenges through clean, effective software.