Fairbrother Cyril
Golang Backend Developer
"Engineering robust, scalable solutions that empower businesses and improve lives through efficient, reliable code."
Summary
My approach as a backend developer is rooted in writing clean, maintainable code that stands up to the demands of high-traffic systems. I believe that thoughtful engineering can drive business growth and make technology more accessible and reliable for everyone.
Highlights of Expertise
Programming & Development
Infrastructure & DevOps
Data & Messaging
APIs & Protocols
Security & Compliance
AI Services
Key Accomplishments
Early Career Success
Demonstrating an early aptitude for technology, I began programming at the age of 14 and secured my first professional role by 16. Opting for home-based education, I successfully balanced rigorous academic study with the development of various business projects. This independent approach enabled me to excel both academically and professionally: I completed my secondary education with distinction and gained admission to the Moscow Technical Institute, where I am pursuing a Bachelor's degree in Cyber Security (remotely).
Decentralized Network Solution
Developed a Decentralized Network Solution Combating Global Internet Restrictions. Engineered a secure, high-availability server network to bypass state-mandated censorship regimes (RKN/Russia, TRA/UAE, MIIT/China), enabling 1,200+ developers, researchers, and professionals to access global opportunities and uncensored information during geopolitical crises.
TCP Port Vulnerability Scanner
Created a TCP Port Vulnerability Scanner in Go identifies open ports and conducts foundational network security evaluations faster than NMAP.
Career Experience
JustMoby, Russia
Golang Backend Developer
May 2025 – Now (Part-Time contract)
The company specializes in information technology, system integration, and internet solutions.
- Authored comprehensive technical documentation for 6 enterprise-scale projects, reducing new developer onboarding time by 65% (from 8 weeks to 2.8 weeks) and improving code maintainability across teams serving 15+ engineers
- Architected and implemented CI/CD pipelines from scratch using GitLab and Docker, reducing deployment time by 85% (from 2 hours to 18 minutes) and enabling 3x faster feature delivery with 40% reduction in deployment errors
- Refactored legacy anti-pattern architecture, eliminating critical development bottlenecks and increasing feature delivery velocity by 45%, enabling the team to ship new features 2.5x faster while improving system scalability by 60%
- Secured backend infrastructure by implementing parameterized queries and comprehensive input sanitization across all database operations, reducing SQL injection vulnerability risk by 99% and achieving enterprise-grade security compliance
- Developed and deployed guest authentication system enabling anonymous user access, increasing user adoption by 35% and expanding potential user base by 25,000+ unregistered visitors monthly while maintaining security standards
- Redesigned database architecture with normalized schemas and optimized relationships, improving query performance by 50% and reducing data redundancy by 70%, while enhancing system maintainability and developer productivity
- Established comprehensive code review standards and processes, reducing production bugs by 55% and improving code quality metrics by 40% through systematic peer review implementation and automated quality gates
- Led comprehensive codebase refactoring initiative using automated linting tools (golint, go vet), improving code consistency by 90% and reducing technical debt by 45% across 50,000+ lines of code while enhancing readability and maintainability
- Developed high-performance CGO-based encode function for Gemini TTS integration, achieving remarkable audio processing efficiency with PCM to AAC format conversion completed in just 1100 milliseconds, demonstrating advanced cross-language optimization and real-time audio processing capabilities
Deventica, Russia
Golang Backend Developer
February 2023 - March 2025
The company specializes in information technology, system integration, and internet solutions.
- Developed high-load microservices in Go, processing 2000+ RPCs per second (p99 < 50ms)
- Implemented personalized result caching for recommendations using Redis, reducing database load by 40%
- Optimized search index structure, tripling search speed
- Ensured 99.5% message delivery for notifications via Kafka
- Configured caching (Redis + local LRU with TTL), cutting database load by 30%
- Optimized SQL queries by eliminating N+1 issues and redundant JOINs, redesigning indexes, and adding partitioning, halving complex query processing time and reducing database load by 30%
- Integrated Kafka for real-time event stream processing, enabling user behavior analytics
- Increased unit test coverage of key microservices from ~30% to 82%, stabilizing the product
- Onboarded two new team members and optimized documentation, reducing adaptation time from 2 months to 3 weeks
- Refactored codebase, enhancing readability, modularity, and ease of feature addition
- Set up Docker Compose for local development, streamlining service launch and testing
- Contributed to architectural decisions on caching, logging, and event processing optimization in Kafka
- Implemented circuit breaker pattern for external API integrations, improving system resilience
- Designed and implemented custom metrics collection using Prometheus for system monitoring
Bokus, Russia
Golang Backend Developer
November 2021 – February 2023
Bokus specializes in IT and software solutions.
- Increased unit test coverage of key microservices to 80%, enabling faster detection and resolution of bugs during refactoring
- Developed ETL scripts in Go for duplicate removal and data migration, reducing database clutter by approximately 25%
- Optimized SQL queries by removing redundant JOINs, minimizing transferred data volume, and using EXPLAIN ANALYZE for assessment, decreasing database load by 20%
- Designed and enhanced microservices for notifications (SMS, email), online doctor appointments, and clinic geolocation
- Integrated Yandex.Maps API, adding clinic search and map display functionality
- Processed JSON (parsing, serialization, validation, transformation) to ensure correct microservice interaction
- Configured request and error logging, adding trace IDs for easier debugging
- Wrote Docker files for microservice deployment and set up Docker Compose for local development
Projects
TCP-Scanner
View on GitHubAdvanced TCP Port Vulnerability Scanner in Go - Developed a high-performance network security tool that implements TCP/IP protocol analysis, OSI model compliance, and comprehensive port scanning capabilities for enterprise network infrastructure assessment.
Network Engineering Features:
- TCP/IP Protocol Implementation: Custom TCP handshake management with SYN, ACK, and FIN flag handling for stealth scanning
- OSI Model Compliance: Layer 3 (Network) and Layer 4 (Transport) protocol analysis with proper packet encapsulation
- Port State Detection: Identifies OPEN, CLOSED, FILTERED, and UNFILTERED port states using advanced TCP state machine
- Service Fingerprinting: Banner grabbing and service identification for common protocols (HTTP, SSH, FTP, SMTP, etc.)
- Network Topology Analysis: TTL-based hop count estimation and route tracing capabilities
- Concurrent Scanning: Worker pool implementation for parallel port scanning with configurable thread management
Security Assessment Capabilities:
- Vulnerability Prioritization: Risk scoring based on open ports, service versions, and common attack vectors
- Network Segmentation Testing: Firewall rule analysis and network boundary assessment
- Protocol Analysis: Deep packet inspection for protocol compliance and anomaly detection
- Infrastructure Auditing: Comprehensive reporting for compliance and security posture evaluation
Technical Stack:
Network Engineering Skills Demonstrated:
- Protocol Analysis: Deep understanding of TCP/IP stack, packet structure, and network protocols
- Network Security: Vulnerability assessment, penetration testing methodologies, and security tool development
- Performance Optimization: High-throughput network scanning with minimal resource consumption
- System Architecture: Scalable concurrent design patterns for network applications
Private Shadowsocks-server
A sophisticated network solution for bypassing internet restrictions with advanced security features.
Technical Innovation:
- Protocol Design: Integrated Shadowsocks with TLS-based obfuscation to evade deep packet inspection (DPI), reducing block detection rates by 92%
- Security Architecture: Enforced strict port filtering and next-gen firewall rules, achieving 99.9% uptime amid sustained DDoS attacks
- Privacy Framework: Randomized traffic routing across 12 global nodes + zero-log policy
Societal Impact:
- Economic Empowerment: Facilitated remote work and job market access for 800+ IT professionals
- Educational Access: Restored connectivity to 15+ blocked academic platforms for 300+ students
- Media Freedom: Secured access to 50+ independent news outlets
Education and Languages
Moscow Technological Institute
Cyber Security faculty (remotely)