Sergey Markov

Provided hands-on full-stack development for high-volume fulfillment and supply chain engineering systems. Architected and optimized scalable distributed services with high availability, data integrity, and strict security compliance.

Supported technical delivery and built full-stack features for a complex multi-tenant SaaS platform using TypeScript and NestJS. Implemented an ad-hoc customer data migration feature focused on 100% data integrity, privacy boundaries, and secure resource sharing at scale.

Delivered high-priority front-end capabilities for a Tier-1 energy SaaS platform in a high-velocity utility environment. Enhanced the UI to handle complex multi-service bundling for enterprise corporate clients while maintaining strict code review standards and high test coverage.

Designed and delivered an end-to-end job-board platform for the Australian Aboriginal community (ATSI Jobs). Built a granular RBAC system and a secure, compliant API layer integrating financial workflows and recruitment distribution networks, and mentored junior developers on clean code practices.

Led end-to-end development, system architecture, and launch of a custom EdTech SaaS platform. Established clean code standards, code review workflows, and automated testing for a stable, audit-ready production environment.

Enhanced and maintained security-focused banking APIs within an Open Banking Platform (OBP) to meet financial sector governance requirements. Built an internal reporting and auditing suite using AWS CloudWatch and maintained 99.9% uptime for critical credit reporting and banking services.

Led a large-scale migration from a legacy PHP monolith to a headless React and Node.js architecture. Managed Terraform-provisioned container infrastructure and implemented extensive end-to-end automated testing to support production stability during high-concurrency peak traffic.