Hi, I'm Sergei — Senior PHP Developer

Senior PHP Developer with 15+ years of experience building SaaS products: billing & subscription systems, API integrations (payments, banks, external services), XML feeds, complex business logic. Experience with AI integrations in production (NLP, speech-to-text, LLMs).

Available for remote B2B contracts.
Based in Novi Sad, Serbia, with a registered legal entity.
CET timezone, 4–6 hours overlap with US Eastern Time.

Current Stack & Tools

My current stack includes Yii2 and Symfony 7 with PHP 8.4, Go for CLI tools, vanilla JavaScript and React / Vue.js for frontend.
• Databases & Search: MySQL/MariaDB, PostgreSQL, MongoDB, Elasticsearch, Redis, ClickHouse
• Caching & Queues: Redis, Memcached, RabbitMQ
• Frontend: vanilla JavaScript, React, Vue.js
• DevOps: Docker, GitLab CI/CD, GitHub Actions, Nginx (rate limiting, caching, reverse proxy setups)
• AI Integration: OpenAI API, LLM-based automation, Speech-to-Text pipelines

Core Experience

• Built SaaS systems from scratch
• Complex business logic
• Maintained and improved legacy PHP projects
• Upgraded old PHP applications to newer PHP versions
• Led a small development team

Contact

Get in touch: LinkedIn