Denis Galetin - Senior PHP & Go Developer

About me

Hi! My name is Denis Galetin, and I'm a Senior Backend Developer with 6+ years of experience specializing in PHP and Go. I build high-performance, scalable web applications that handle millions of requests daily.

My expertise spans the entire backend ecosystem — from architecting microservices and optimizing database performance to implementing CI/CD pipelines and leading development teams. I've successfully migrated legacy PHP systems to modern Go microservices, achieving significant performance improvements and cost reductions.

You can explore my open-source contributions on GitHub, connect professionally on LinkedIn, or reach out directly via Telegram.

I'm passionate about solving complex technical challenges, mentoring teams, and building systems that make a real business impact. Let's discuss how I can contribute to your next big project.

6+
Years Experience
PHP & Go Development
15+
Microservices
Built & Deployed
8+
Team Members
Led & Mentored
3
Major Migrations
PHP to Go Systems

Technical Expertise

Backend Development

PHP
6+Expert
Go (Golang)
4+Expert
Laravel
5+Expert
Symfony
3+Advanced
Gin/Echo
3+Expert
REST APIs
5+Expert
GraphQL
2+Advanced

Databases & Storage

MySQL
6+Expert
PostgreSQL
4+Expert
Redis
4+Expert
MongoDB
2+Advanced
ClickHouse
2+Advanced
Elasticsearch
2+Intermediate

DevOps & Infrastructure

Docker
4+Expert
Kubernetes
3+Advanced
AWS
3+Advanced
CI/CD
4+Expert
Jenkins
3+Advanced
GitLab CI
3+Advanced
Terraform
2+Intermediate

Architecture & Performance

Microservices
4+Expert
API Gateway
3+Expert
Message Queues
4+Expert
RabbitMQ
3+Advanced
Apache Kafka
2+Advanced
Load Balancing
3+Advanced
Nginx
4+Advanced

Leadership & Professional Skills

Team Leadership

Led cross-functional teams of up to 8 developers, conducting performance reviews and career mentoring

Managed team retention rate of 85%+
Mentored 12+ junior developers with 100% promotion rate

Technical Communication

Bridge technical and business stakeholders, presenting complex solutions in clear, actionable terms

Conducted 15+ technical interviews
Led architecture decision meetings

Problem Solving

Analytical approach to complex system issues, focusing on root cause analysis and long-term solutions

Reduced production incidents by 70%
Solved critical performance bottlenecks

Innovation & Learning

Continuously evaluate and implement new technologies to improve system performance and team efficiency

Led PHP to Go migrations
Introduced modern DevOps practices

Project Management

Deliver projects on time and within scope while maintaining high code quality standards

Reduced deployment time by 95%
Completed contract projects ahead of schedule

Stakeholder Relations

Build strong relationships with clients, business teams, and external partners

Managed API integrations with 200+ partners
Improved client satisfaction through automation

Key Achievements & Impact

Legacy System Modernization

Successfully migrated 3 monolithic PHP applications to Go microservices, reducing server costs by 50% and improving response times by 400%

50% cost reduction

Cross-Team Technical Leadership

Led technical decisions across 3 development teams, established coding standards and mentored 12+ junior developers in PHP/Go best practices

12+ developers mentored

High-Load Systems Architecture

Designed and implemented distributed systems handling 100M+ API requests daily with auto-scaling and circuit breaker patterns

100M+ requests/day

DevOps Pipeline Implementation

Built CI/CD pipelines and containerized applications, reducing deployment time from 2 hours to 5 minutes with zero-downtime deployments

95% faster deployments

Notable Projects

European Payment Gateway System

Senior Backend Developer

Developed secure payment processing platform serving millions of users across Europe with multi-currency support, fraud detection, and PCI DSS compliance

PHPLaravelMySQLRedisDockerAWS

Automation & Integration Platform (Zapier-like)

Backend Lead Developer

Built scalable workflow automation platform connecting 200+ APIs with real-time data synchronization and custom trigger-action chains

PHPLaravelMySQLRedisDocker

iGaming High-Load Platform

Senior Backend Developer

Architected real-time gaming platform handling multi-million user base with microsecond latency requirements and 99.99% uptime

GoRedisClickHouseKafkaKubernetes

AI-Powered Analytics Platform

Senior Backend Developer

Contributed to enterprise AI platform development in 15+ member team, implementing machine learning pipelines processing 50M+ data points daily with real-time predictions

GoPythonTensorFlowPostgreSQLRedisKubernetes

Tap-to-Earn Gaming Platform (Hamster Combat-style)

Senior Backend Developer

Built high-performance clicker game backend handling 100M+ taps daily with advanced anti-cheat systems, leaderboards, and reward distribution for 10M+ active users

GoRedis ClusterPostgreSQLKafkaDocker

Education & Certifications

Specialist in Information Security of Automated Systems

North Caucasus Technical University

2011 - 2016

5-year specialized program covering cybersecurity, system administration, and software development fundamentals

Degree

Professional Experience

Career Progression & Impact:

  • Ltd. Venson

    Senior Full-Stack Developer (PHP/Go)

    September 2022 → Present

    Architected microservices migration from PHP to Go, improving performance by 300% and reducing operational costs by $50k annually
    Led team of 6 developers in building high-load financial APIs handling 10M+ transactions daily, enabling company expansion to 3 new markets
    Implemented CI/CD pipelines reducing deployment time from hours to minutes, increasing team productivity by 40%
    Reduced production incidents by 70% through comprehensive test coverage, saving 20+ hours/week in debugging time
    Automated payment integration processes using standardized templates, reducing new integration time from 2 weeks to 2 days
    Conducted technical interviews for 15+ developer candidates and managed team performance evaluations, improving team retention by 85%

  • VK Team

    Senior Backend Developer (PHP/Go)

    September 2021 → September 2022

    Left to pursue better career growth opportunities in fintech sector

    Developed Go-based real-time messaging system serving 50M+ users, supporting company's core social platform
    Optimized PHP legacy code improving API response times by 400%, directly improving user experience metrics
    Mentored 3 junior developers in modern backend practices, with all receiving promotions within 6 months
    Implemented comprehensive code review process enforcing SOLID principles, reducing bug reports by 45%
    Optimized critical SQL queries reducing database load by 60%, saving $30k annually in infrastructure costs
    Established automated testing pipeline covering 85% of core functionality, preventing 20+ critical bugs from reaching production

  • Albato

    PHP Developer

    March 2021 → September 2021

    Short-term contract role; completed all project deliverables ahead of schedule

    Built integration platform handling 1M+ API calls daily with 99.5% uptime, enabling customer automation workflows
    Developed high-performance PHP services for CPU-intensive operations improving efficiency by 200%, reducing server costs by $15k
    Implemented robust error handling and monitoring systems, reducing customer support tickets by 60%
    Delivered new system features using modern design patterns, completing 3-month project in 5 months
    Refactored legacy codebase reducing technical debt by 40%, improving future development velocity
    Integrated 5 major payment systems with unified API interface, expanding platform capabilities

  • AYA Group

    PHP Team Lead / PHP Developer

    January 2020 → March 2021

    Led backend development processes and team of 5 developers
    Researched and evaluated Go language for future performance-critical components
    Conducted technical interviews and onboarded 8+ new developers
    Established application architecture standards and ensured compliance
    Developed complex SQL queries and database optimization strategies
    Organized technical meetups and knowledge sharing sessions
    Implemented code review standards and development best practices

  • Hidden Team

    PHP Developer

    February 2019 → January 2020

    Built scalable web applications using modern PHP frameworks (Laravel, Symfony)
    Developed new administrative panel features and fixed existing system bugs
    Researched emerging technologies and modern development practices
    Optimized complex SQL queries improving system performance by 150%
    Integrated payment systems and maintained legacy code
    Collaborated with cross-functional teams on product development