03/24/2026 updated
KZ
100 % available
Node.js Backend Developer
Varna, Bulgaria
Worldwide
Bachelor's Degree in Software EngineeringAbout me
Node.js Backend Developer with 4+ years of experience building high-load APIs and distributed data- processing systems. Specialized in performance optimization, legacy system refactoring, and designing microservices and event-driven architectures.
JavaScriptApplication Programming Interfaces (APIs)AutomationDevelopment TestingDistributed Data StorePython (Programming Language)PostgreSQLMongoDBNode.jsPerformance TuningSystems Development Life CycleQueueing SystemsRabbitMQRedisTypeScript
Backend Development
Node.js Backend Development with 4+ years of experience building high-load APIs and distributed data-processing systems
Performance Optimization
Performance optimization, legacy system refactoring, and designing microservices and event-driven architectures
Database Management
MongoDB, PostgreSQL, and Redis database management with focus on improving API latency and reliability
Programming Languages
JavaScript (Node.js), TypeScript, and Python development
API Development
NestJS, Express.js, and REST APIs development
Testing and Automation
Puppeteer and Jest testing frameworks
Message Queues
Kafka and RabbitMQ messaging systems
Development Tools
Git, Bitbucket, Docker, Grafana, ELK stack, and error tracking tools like Bugsink
Node.js Backend Development with 4+ years of experience building high-load APIs and distributed data-processing systems
Performance Optimization
Performance optimization, legacy system refactoring, and designing microservices and event-driven architectures
Database Management
MongoDB, PostgreSQL, and Redis database management with focus on improving API latency and reliability
Programming Languages
JavaScript (Node.js), TypeScript, and Python development
API Development
NestJS, Express.js, and REST APIs development
Testing and Automation
Puppeteer and Jest testing frameworks
Message Queues
Kafka and RabbitMQ messaging systems
Development Tools
Git, Bitbucket, Docker, Grafana, ELK stack, and error tracking tools like Bugsink
Experience
Professional experience5 - 10 years
Freelancer since2026
Languages
GermanBasic knowledgeEnglishFluentRussianNative speaker
Project history
High-load logistics system for cargo-to-ship matching, freight negotiation, and search. Designed and evolved high-load backend services for cargo matching and freight negotiation workflows in a distributed system. Performed architectural impact analysis and introduced changes in a tightly coupled legacy system without breaking existing functionality. Improved API performance and responsiveness by optimizing database queries, request handling, and service interactions in an event-driven architecture. Contributed to technical design decisions improving system reliability and scalability.
Systems for order processing, freight trading, and contract management. Developed browser automation and testing workflows using Puppeteer to validate business-critical processes. Built resilient scraping pipelines handling dynamic DOM, frequent UI changes, and unstable external systems. Implemented data processing and normalization logic to prepare datasets for downstream services. Contributed to backend services supporting trading and contract workflows.