Mir Shafayat Ahmed

Professional Summary

Software + Infrastructure Engineer with 3+ years in payment systems at Chaldal PLC. Advanced from intern to L3, leading payment infrastructure, handling 5,000+ daily transactions, and managing 140+ Kubernetes deployments across 4 physical datacenters in Bangladesh and Singapore. Technical lead for PCI DSS compliance and secure payment solutions. Experienced in distributed systems, microservices (gRPC, Orleans), secure coding, and network infrastructure. A curious generalist at heart — give me an interesting problem I don't understand, and I'll dig deep until I solve it.

Technical Skills

Languages:	F#, C#, Python
Frameworks:	.NET, Orleans (actor model), REST APIs, gRPC, Microservices architecture
Payment Systems:	Payment gateways (Braintree, bKash, Nagad, Portpos), 3D Secure, PCI DSS compliance
Infrastructure:	Kubernetes, Docker, SQL Server, Mikrotik, Wireguard, OpenVPN, Active Directory
Tools & Methods:	Git, Ansible, Azure DevOps CI/CD, Helm, CheckMk, Microsoft App Insights

Professional Experience

Chaldal PLC, Bangladesh Feb 2023 — Present

Software Engineer (L3) - Payments + Infrastructure Team

Led gRPC integration between Payments and Grocery microservices, replacing polling with event-driven architecture and improving response times
Led PCI DSS compliance to completion and architected the Card Vault service with secret sharing, mTLS, tokenization, PKE, network segmentation, and data center coordination
Core developer for ChaldalPay platform: built transaction engine for transfers, merchant payments, utility bills, and wallet top-ups with fraud detection
Implemented maker-checker authorization and comprehensive activity logging across the ChaldalPay system
Integrated 5+ payment gateways (bKash, Braintree with 3D Secure, PortPos, Nagad, EKPAY) with resilient error handling and retry mechanisms
Built network security infrastructure: Mikrotik core routers, SIEM, site-to-site and employee VPNs, firewalls, and Active Directory integration
Owned on-call incident response across Kubernetes log debugging, network inspection, and database quorum management
Mentored 2 engineers and onboarded 4 team members on actor-based frameworks and payment systems

Chittagong International School, Bangladesh Sept 2018 — Jun 2019

Physics Teacher - Grade 6 to 9

Taught Physics grades 6-9; guided a student team to create a video that won the British Council Your World Competition 2019 national round
Developed differentiated curriculum and after-school programs for students at varying learning levels

Personal Projects

BGP Bangladesh 2026

Personal exploration and community education project visualizing how Bangladesh connects to the global internet based on publicly available BGP data — mapping BGP routes, peering relationships, and gateway paths. Because understanding infrastructure shouldn't require reading RFCs.

Dorbar Dekchi Tracker 2026

Freelance work for a traditional institution. Logistics platform built in 15 days — tracked 800 reusable food pots across multiple fast-paced and chaotic distribution cycles, ultimately feeding ~450,000 people. React PWA with Firebase real-time dashboards shown on Google TV displays, GCP storage for delivery receipts, and volunteer-facing web forms to update container status and delivery routes.

IoT Greenhouse Hydroponics 2022

End-to-end embedded systems project — built all electronics, wrote all firmware, and deployed Firebase backend for real-time monitoring and control of pH, temperature, humidity, and nutrient delivery.

Student Enrollment Analysis 2021

First "real" team project — still proud of it. Used Pandas/NumPy to clean messy 100K+ line Excel sheets and built a Django/MySQL analytics platform with interactive visualizations.

Professional Summary

Technical Skills

Professional Experience

Personal Projects

Education

Languages

Interests