Ragib Hasan
Engineering Lead & Technical Architect
Specializing in Multi-Tenant SaaS • Microservices • Cloud Infrastructure
Experience
6+ years building scalable systems and leading engineering teams
Sole Engineering Lead and backend architect for ZOYEQ, a multi-tenant SaaS integrating e-commerce, POS, inventory, and AI modules.
- •Served as sole Engineering Lead and backend architect, leading a cross-functional team of 6 to deliver ZOYEQ end-to-end, serving 500+ active tenants
- •Resolved a critical database connection exhaustion issue via lazy initialization and LRU eviction, cutting peak connections 94% and cold starts from 45s to 3s
- •Engineered a fault-tolerant, event-driven microservices ecosystem with RabbitMQ, decoupling services to handle high-concurrency workloads without downtime
- •Integrated Google Gemini AI for automated product content, SEO generation, dynamic landing pages, and malicious-code detection on user-submitted inputs
- •Orchestrated a fully automated CI/CD pipeline with GitHub Actions and Kubernetes, cutting deployment time by 60%
Architected ERP systems for DX Group, Bangladesh's largest electronics distributor and national distributor for Xiaomi.
- •Built ERP system processing 10,000+ daily orders
- •Designed multi-organization architecture with data isolation
- •Reduced manual reporting work by 75%
Built and optimized Learning Management Systems.
- •Delivered LMS platform serving 10,000+ students
- •Reduced server costs by 35% through optimization
- •Led team expansion and mentored junior developers
Web Developer
atClimax ITFull-stack development and system integration.
- •Delivered multiple client projects on time
- •Implemented secure payment gateway integrations
Started career in enterprise software development.
- •Built database management systems
- •Learned enterprise development practices
Engineering Deep Dive
Technical writing on architecture decisions and lessons from production
Architecting for N-Tenants: Database Connection Exhaustion
How we scaled from 300 to N tenants without adding infrastructure. The fix? Replace eager connection initialization with lazy loading, promise caching, and LRU eviction.
Event-Driven Microservices: Decoupling Services with RabbitMQ
How backend services publish events through RabbitMQ instead of calling each other directly, with retry queues, dead lettering, and idempotent consumers, built as an event-driven system from day one.
The Transactional Outbox Pattern: Making Event Publishing Atomic
How to guarantee a database write and the event it triggers either both happen or neither does, closing the one gap the RabbitMQ post left open, with a polling relay, a change-stream alternative, and where else the pattern applies.
Remote Work Ready
Equipped with the infrastructure, skills, and mindset to thrive in remote-first environments. Proven ability to deliver enterprise-grade systems independently.
Global Collaboration Ready
Experienced in coordinating with distributed teams and stakeholders
Flexible Schedule
Available for overlapping hours with US/EU/APAC time zones
Clear Communication
Strong written and verbal skills for effective async collaboration
Reliable Setup
Dedicated home office with fiber internet (100Mbps+) and backup power
Remote Tools Proficient
Proficient with Slack, Zoom, Jira, GitHub, Notion, Linear
Self-Driven
Proven track record of delivering complex projects independently
Open to Remote Opportunities Worldwide
Available for full-time positions • Can start within 2-4 weeks • Open to relocation for the right opportunity
Technical Expertise
Comprehensive full-stack capabilities spanning architecture design, cloud infrastructure, monitoring, and team leadership across the entire software development lifecycle.
Backend & Architecture
Databases & Storage
Cloud & DevOps
Monitoring & Observability
Frontend & Tools
Message Queues & Integration
Leadership & Product Strategy
Passionate about building robust, scalable systems and leading engineering teams to deliver exceptional results through technical excellence and collaborative leadership.
Technical Leadership
End-to-end project ownership from architecture design to deployment, leading cross-functional teams and delivering scalable solutions.
ZOYEQ - Multi-Tenant E-Commerce SaaS Platform
Engineering Lead & Architect (Solo Backend & Infrastructure)
Enterprise-grade multi-tenant SaaS integrating e-commerce, POS, and inventory management, with AI-powered content modules built in. Single-handedly architected and built complete backend infrastructure (6 microservices) from concept to production, serving 500+ active tenants on separate databases per tenant. Integrated Google Gemini AI for content generation and security scanning, 4 payment gateways (SSLCommerz, bKash, Stripe, PayPal), and comprehensive monitoring stack (Prometheus, Grafana, Loki).
Key Achievements
Technology Stack
EBS - Enterprise Resource Planning
Technical Lead & System Architect
Full-scale ERP solution architected for DX Group, Bangladesh's largest electronics distributor, handling complex supply chain and inventory management.
Key Achievements
Technology Stack
Ticketing & Event Management Platform
Full-Stack Developer & Technical Lead
Scalable ticketing platform with real-time seat selection, payment processing, and comprehensive event management capabilities.
Key Achievements
Technology Stack
Education & Publications
Academic background and research contribution in modern video game development
Education
University of Asia Pacific • Dhaka • Graduated 2020
Publications
Published in Lecture Notes in Networks and Systems • Springer, Singapore
January 2020 • Conference Paper
Introduced methodology to optimize 3D mesh for wide hardware compatibility, demonstrating significant performance improvements through poly count reduction.
Contact
Let's discuss opportunities, collaborations, or technical challenges