Ahnaf Shoumik

Senior Software Engineer

INNOLYTIC IT LTD • Full-time

Oct 2020 - Present • 5 yrs 11 mos

Lead backend development across PHP/Laravel applications and OpenCart-based e-commerce platforms, owning features end to end from requirement clarification through deployment and production support. • Build and maintain heavily customised OpenCart 3 and OpenCart 4 storefronts — custom modules, admin tools, event/hook-driven extensions, template overrides, and order-management workflows — including debugging third-party modules broken by OpenCart 4's stricter typing and architectural changes. • Integrate payment and shipping gateways into client checkout flows, handling webhook verification, transaction state reconciliation, failure and retry paths, and order-status synchronisation with logistics providers. • Administer and secure production Linux servers: environment provisioning, Nginx/Apache and PHP-FPM configuration, SSL certificates, permission and ownership models, cron scheduling, firewall and SSH hardening, backup routines, and log-driven incident diagnosis. • Diagnose and resolve complex production issues spanning application code, MySQL performance, dependency conflicts, environment configuration, and deployment — often on live client systems under time pressure. • Execute large-scale database operations across multi-tenant MySQL environments, including bulk schema migrations across many client databases, query optimisation, and recovery of corrupted dump data. • Scope and estimate project work for enterprise clients, producing phased delivery plans and module-level effort and cost breakdowns for stakeholder approval. • Optimized website speed, implemented fastloading mechanism that makes websites load within 2 seconds and scaled the project for larger user base, • Implemented 4 layers DDOS protection for the saas tenants. Stack: PHP 8 · Laravel · OpenCart 3/4 · MySQL · JavaScript/jQuery · Nginx · Linux · Git · Flutter