Headline: Software Engineer | Ruby/Python/Java/Clojure, Generative AI, Algo Trading, Event Sourcing/CQRS/DDD, Computer Vision, Real-time Systems, Modern UI.
Location: Serbia, Belgrade
Email: esshka@gmail.com
Web: esshka.github.io
GitHub: github.com/esshka
Twitter: twitter.com/genesshk
Software Engineer & Architect with 15+ years of experience building complex, high-performance systems. Background in Applied Mathematics and Computer Science provides strong fundamentals in algorithms, data structures, and the theoretical foundations of machine learning.
Currently focused on Generative AI, Computer Vision, Algorithmic Trading, and Neuroevolution, leveraging deep expertise in Java and Clojure ecosystems for high-concurrency systems, alongside low-latency engineering and Python for Machine Learning models. Extensive track record in Fintech/DeFi, Real-time Metaverse, Distributed Microservices and Full-Stack development. A proponent of Clean Architecture, DDD, and Event-Driven systems, combining the hands-on delivery of a Senior Engineer with the strategic oversight of an Architect. Maintained Top Rated Plus status on Upwork since 2016 with a 100% Job Success Score.
Distributed Systems, Event-Driven Architecture (EDA), CQRS & Event Sourcing, Domain-Driven Design (DDD), Hexagonal/Clean Architecture, SOLID, Microservices, High-Frequency Trading (HFT) patterns, CleanML.
React, Svelte, Next.js, Advanced State Management (MobX/Redux/Zustand/Signals), Unidirectional Data Flow, Micro-frontends, Server-Side Rendering (SSR), Real-time Visualization (Canvas/WebGL).
Architecting Autonomous Agentic Systems and Pipelines, MCPs, Advanced RAG (Hybrid Vector/Graph Search), LLM Fine-tuning (p-tune, Lora, SFT), Neuroevolution, Reinforcement Learning (PPO, Q-Learning), Genetic Algorithms (Neuroevolution), Computer Vision, PyTorch/TensorFlow, Architecting custom models.
Primary: Python (FastAPI, LangChain/LlamaIndex, Machine Learning), Ruby (Ruby on Rails - Full Stack dev), Java (High-Performance, Low-Latency GC, Concurrency), Clojure (Concurrent Systems, Stream Processing, Immutable Data)
Full-Stack/Web: Ruby (Ruby on Rails), TypeScript (React, Svelte), JavaScript (Node.js), Historic Mastery: C# / .NET Ecosystem (MCSD Certified)
Utility & Hobby: Go (System tools, Microservices), OCaml (Functional patterns, Prototyping)
PostgreSQL, SQLite, Elasticsearch/OpenSearch, Kafka, Redis, ClickHouse, Time-series DBs, Vector DBs (pgvector/Pinecone/Milvus).
MLOps (RAG, Inference pipelines), Docker, GitHub Actions, Observability (Prometheus/Grafana/Tracing).
Solidity, Rust, On-chain indexing, Wallet Auth, Settlement pipelines, DeFi risk engines.
I work on complex, high-performance systems across Generative AI, Computer Vision, Algorithmic Trading, Fintech/DeFi, Distributed Microservices, Full-Stack products, and Real-time platforms.
My strongest fit is work that needs hands-on engineering plus architecture: event-driven systems, CQRS/Event Sourcing, DDD, low-latency services, high-concurrency JVM systems, modern UI architecture, and Python-based machine learning pipelines.




