Monolith to Go services
Strangler-pattern extraction: an API gateway first, then services one by one, with traffic switched over while the monolith stays live.
Andrey Bogdanov
Senior Backend Engineer · Go / PHP
I build and untangle backend systems for marketplaces and payments. Right now I'm moving a PHP monolith to Go services — without stopping it.
Available for contract work · B2B · remote · GMT+4
About
Backend engineer with 13+ years of experience, working in Go and PHP on marketplace and payment systems — from a European B2B marketplace to luxury retail with 300K+ SKU and a fashion platform with 10,000+ sellers.
I'm comfortable on both sides of a migration: 4+ years of production Go (gRPC, Kafka, event-driven services) and 13 years of PHP/Symfony in codebases of over a million lines — which is what it takes to read the legacy before replacing it.
AI coding agents are my default way of working: Claude Code as the main environment, Codex CLI for delegated tasks, and a tool layer I built myself that connects the agent to GitLab, Jira, Confluence, CI and production logs.
What I can help with
Large PHP / Symfony codebases
Slow SQL and endpoints, refactoring, and test suites that keep CI fast — in codebases of a million lines and more.
Payments and event-driven flows
Kafka with a transactional outbox, idempotent consumers, retries and dead-letter queues, so money-related events survive redelivery and partial failures.
AI in the development process
Coding agents wired into GitLab, Jira and CI, and LLM code review measured on a seeded-defect benchmark before it reaches the team.
Selected results
4 Go services
API gateway, admin, access control and reporting extracted from a PHP monolith into production while it stayed live.
Fashion marketplace
up to 80% faster
page loading for 10,000+ sellers after optimising slow SQL queries and refactoring PHP endpoints.
Fashion marketplace
10× faster search
across 300K+ products with an event-driven product index on Go, Kafka and Elasticsearch.
Luxury marketplace
30% fewer stockouts
and 20% faster delivery for 5,000+ B2B customers with a demand-planning service built on DDD.
B2B marketplace
Experience
- 2024 — now
Senior Backend Engineer, Go / PHP · Global Fashion Group
International marketplace, Seller Center
- 2022 — 2024
Senior Software Engineer, Go · TSUM
Luxury online marketplace
- 2019 — 2022
Senior Software Engineer, PHP · METRO AG
European B2B marketplace
- 2017 — 2019
Senior Software Engineer, PHP / Python · Olymptrade
Analytics and marketing
- Go
- gRPC
- Kafka
- PHP 8
- Symfony
- PostgreSQL
- MySQL
- Redis
- Elasticsearch
- Kubernetes
- Docker
- Terraform
- AWS
- GitLab CI
- Prometheus
- Grafana
Full history on LinkedIn.
Contact
Contract work, B2B, fully remote from Georgia (GMT+4). The fastest way to reach me is [email protected].