Maksym Dernovyi

Senior backend developer with 11 years of commercial PHP experience. I build and fix the parts of a system nobody sees but everyone depends on: APIs, integrations with ERP and payment systems, data sync, databases and performance. Adobe Certified Expert (Adobe Commerce Cloud Developer).

Track record:
- 8 years as lead hands-on developer for a US B2B retailer: migrated the platform from Magento 1 to 2, upgraded to 2.4.6 / PHP 8.2, moved it to a shared multi-country 2.4.8 platform
- 80+ custom modules, 1,500+ merged pull requests, release and hotfix management
- Two-way ERP sync with NetSuite (SOAP, REST, SuiteQL, OAuth), streaming import of 100K+ records
- REST and SOAP APIs built from scratch for mobile apps
- Open-source: SSO (OIDC) with Okta, Entra ID and Google, a SCIM 2.0 provisioning server, passkey (WebAuthn) login

What I can take on:
- PHP backend work (PHP 5.6 to 8.5): new features, refactoring legacy code, upgrades
- REST/SOAP APIs and third-party integrations: ERP, PIM, payments, tax, shipping, SSO
- MySQL: slow-query optimisation, indexing, data migrations
- Performance: Redis, Varnish, Elasticsearch/OpenSearch, Typesense, caching, memory leaks
- Security: CSRF/XSS/path-traversal fixes, CSP, access control hardening
- Tests and CI: PHPUnit, Playwright, Docker, Git flow
- Anything Magento / Adobe Commerce, including B2B pricing, checkout and Hyvä

How I work: async (Jira, Git, pull requests, Slack), clear written English, code you can maintain after I leave. Open to long-term contracts, hourly support and fixed-scope tasks. Send me the problem — I will tell you honestly whether I am the right person for it.