Igor Voronin
Haifa,TA
Summary
Backend Developer recognized for exceptional productivity and efficient task execution. Specialized in API development, database management, and cloud services integration. Strong problem-solving abilities and adaptability enhance collaboration with cross-functional teams.
Overview
7
7
years of professional experience
Work History
Full Stack Developer
Freelance
Remote
04.2025 - 12.2025
- Designed and developed a full-stack marketplace platform using NestJS and NextJS, enabling users to buy and sell digital goods.
- Built a real-time chat system using WebSockets to support direct buyer–seller communication.
- Implemented a dispute resolution system, allowing users to open cases, exchange messages, and track dispute status.
- Developed secure payment processing workflows, including transaction verification and order state management, using the Heleket API.
- Implemented user authentication, authorization, and role-based access control using a JWT-based authentication system.
- Built a comprehensive admin panel for managing users, listings, transactions, disputes, and platform analytics.
- Designed backend APIs for listings, orders, payments, and messaging.
- Ensured data consistency between transactional flows and user interactions.
- Optimized backend performance and latency for real-time workloads using Redis and WebSockets.
- Deployed production infrastructure using Docker and GitHub Actions.
Backend Developer
Swify Agency
Remote
02.2024 - 01.2025
- Developed RESTful APIs using NestJS to enhance front-end applications and user functionality.
- Collaborated with cross-functional teams to define software requirements and timelines.
- Implemented PostgreSQL and MySQL database solutions to optimize data storage and retrieval.
- Optimized database queries using indexes and foreign keys.
- Conducted code reviews to enforce quality standards and best practices adherence.
- Integrated third-party services and APIs, like OpenAI API, Infura, and Alchemy, improve application features and performance.
- Troubleshot backend issues with PM2 and Grafana, ensuring system reliability and performance stability.
- Wrote unit tests using Jest to validate code functionality and uphold software quality.
- Deployed timely software updates and bug fixes on production servers with CI/CD GitHub Actions.
- Implemented an AI-driven assistant capable of invoking backend functions and workflows based on user intent.
- Built a secure middleware layer connecting LLM responses with internal REST APIs and backend services.
- Implemented Web3 authentication using wallet-based message signing
- Implemented blockchain event indexing to track on-chain activity in real time.
- Built services to listen to smart contract events and synchronize on-chain data with backend systems.
- Tracked user wallet balances and token holdings across blockchain networks using Infura.
- Designed and developed smart contracts in Solidity for token transfers and business logic. Implemented access control, modifiers, and secure contract patterns.
- Implemented caching techniques using Redis for improved speed and user functionality.
- Containerized backend and AI services using Docker for consistent development and production environments.
- Implemented event-driven architecture using Apache Kafka for asynchronous communication between backend services.
- Integrated DeFi protocols and DEXs, including Uniswap, 1inch, Jupiter, and PumpFun.
- Protected infrastructure using Cloudflare WAF and DDoS mitigation.
- Integrated crypto payment gateways, including NowPayments, FreeKassa, and Heleket.
- Worked with Solana Web3, Anchor, SPL tokens, and Helius API.
- Designed and implemented real-time chat messaging using WebSockets for a marketplace application.
Full Stack Developer
AltSpread
Remote
03.2022 - 02.2024
- Integrated object-oriented design techniques into projects, supporting usability objectives.
- Devised automation and backup protocols, ensuring data preservation and security.
- Collaborated with systems analysts, engineers, and programmers to troubleshoot limitations and resolve software issues.
- Developed secure backend systems for safeguarding client data integrity.
- Monitored server logs to detect malicious activity and unauthorized access attempts.
- Configured firewalls and intrusion detection systems to bolster network security.
- Implemented rate-limiting system for crucial API endpoints
- Implemented WebSockets logic for users to receive backend data faster and not to spam with long polling.
- Developed OAuth strategies for users to log in via Twitter and Google.
- Implemented asynchronous task processing using RabbitMQ to decouple backend services.
- Identified and mitigated common vulnerabilities, including injection, XSS, CSRF, and broken authentication.
- Configured and optimized servers with Nginx, SSL, reverse proxying, and load balancing.
- Built frontend applications using React and Next.js with SSR/SSG for performance and SEO.
- Built arbitrage and analytics bots for crypto markets across centralized and decentralized exchanges.
- Containerized backend services using Docker, and managed production processes with PM2.
Full Stack Developer
SNUS&NGS
Remote
04.2020 - 01.2022
- Constructed full-featured e-commerce marketplace using React.JS and NestJS frameworks.
- Enabled user purchases on the marketplace, processing payments, order creation logic, authentication using JWT, implemented oauth for telegram.
- Architected backend services with NestJS, TypeORM, PostgreSQL, MySQL, and MongoDB.
- Integrated Cryptomus and FreeKassa for secure payment processing.
- Designed scalable infrastructure with Cloudflare Load Balancer in a 10-server configuration.
- Deployed production infrastructure on AWS while ensuring operational efficiency.
- Developed scalable web applications, leveraging React and NestJS frameworks.
- Implemented security measures, including authentication protocols like JWT, and encryption algorithms like BCRYPT for passwords.
- Secured APIs against SQL injection, XSS, CSRF, and broken access control.
Full Stack Developer
Freelance
Remote
05.2019 - 03.2020
- Created responsive web applications utilizing HTML, CSS, and JavaScript frameworks.
- Designed interactive user interfaces for websites and applications to enhance user engagement.
- Developed and maintained user-facing webpages with HTML, CSS, JavaScript, and jQuery.
- Ensured clean, valid HTML and CSS markup aligned with industry standards.
- Collaborated with back-end developers to effectively integrate user interface elements.
- Engineered reusable components for future projects to minimize development effort.
Education
High School Diploma -
Makif Yud-Alef
Ashdod06-2024
Skills
- Microservices architecture
- CI/CD pipelines
- Web3 technologies
- Backend development
- AI software engineering
- SQL and NoSQL databases
- Nextjs framework
- AWS cloud services
- PostgreSQL database
- Nodejs runtime
- NestJS framework
- Docker containerization
- React library
- MySQL database management
- API development and integration
- Database management strategies
- Code review processes
- Security protocols implementation
- Backend architecture design
- Team leadership skills
- UI enhancements
- Message broker expertise
- Database management proficiency
- RESTful API expertise
- GitHub collaboration tools
- API documentation experience
- Cloud deployment
- Database optimization
- Redis
- RabbitMQ
- Apache Kafka
- LLM
- Solidity
- Smart Contracts
- OWASP Top 10
- WebSockets
Languages
- English
- Russian, Expert
- Hebrew
- Ukrainian, Expert
Languages
English
Advanced (C1)
C1
Hebrew
Upper Intermediate (B2)
B2
Russian
Native
Native
Ukrainian
Proficient (C2)
C2
Timeline
Full Stack Developer
Freelance
04.2025 - 12.2025
Backend Developer
Swify Agency
02.2024 - 01.2025
Full Stack Developer
AltSpread
03.2022 - 02.2024
Full Stack Developer
SNUS&NGS
04.2020 - 01.2022
Full Stack Developer
Freelance
05.2019 - 03.2020
High School Diploma -
Makif Yud-Alef