Software + Infrastructure Engineer with over 3 years of diverse experience in payment systems development
and integration at Chaldal PLC (Bangladesh). Advanced from intern to L3 (Mid level) through demonstrated
technical aptitude and leadership in payment processing infrastructure handling 5,000+ daily transactions.
Technical point of contact for PCI DSS compliance and implementation of secure payment solutions (e.g. Card Vault).
Experienced in Distributed Systems, API Integrations, Secure Coding practices, DevOps, Datacenter Management,
and Technical Communication. A curious generalist at heart, with a passion for understanding systems deeply
and delivering robust solutions.
Mir Shafayat Ahmed - Bio
Skills
Let's get in touch!
-
2019 - 2024
Independent University, Bangladesh (IUB)
Dhaka, Bangladesh
BSc. in Computer Science
GPA: 3.69/4.00
-
2016-2018
Presidency International School (PIS)
Chattogram, Bangladesh
CAIE A Levels
Physics, Maths: A Chemistry: C -
2010-2016
Chittagong International School (CIS)
Chattogram, Bangladesh
Grade 6 to Cambridge O' Levels
Physics, Maths D: A*,
Add. Maths, English, Bengali: A,
Chemistry, Biology, ICT: B+ -
Till 2010
International School And College (ISC)
Chattogram, Bangladesh
Software Engineer (L3)
Chaldal PLC, Bangladesh - Payments + Infrastructure Team
- Led gRPC integration between Payments and Grocery microservices, improving system reliability and response times
- Technical POC and orchestrator for PCI DSS audit compliance, implementing secure vault service with encryption, secret sharing, and secure coding practices
- Core developer for ChaldalPay platform, building end-to-end transaction features including user transfers, merchant payments, utility bill payments, and wallet top-ups with fraud detection
- Implemented extensive admin activity logging throughout the ChaldalPay system with maker-checker controls
- Integrated multiple third-party payment APIs (bKash, Braintree, PortPos, Nagad, EKPAY) with resilient error handling and retry mechanisms
- Enhanced payment security by implementing 3D Secure authentication (Braintree), improving customer experience and reducing fraud
- Managed and maintained 140+ different Kubernetes deployments as part of Chaldal's overall infrastructure
- Established network security infrastructure: configured Mikrotik core routers and switches, SIEM, site-to-site + employee VPNs, firewalls, and Active Directory integration
- Mentored 2 engineers and onboarded 4 team members on actor-based frameworks, state management, payment systems and accounting
- Regular on-call experiences requiring Kubernetes log debugging, extensive code reviews and patches, network inspection, database quorum management
Physics Teacher
Chittagong International School
- Fulltime teacher of Physics, Grade 6 to 9
- Guiding Students to a win at the National Round of British Council Your World Competition 2019
- Researched and introduced new books and resources to modernize the School Curriculum
Title 1
subtitle
Lorem, ipsum dolor sit amet consectetur adipisicing elit. Nulla ad asperiores deserunt placeat eum dignissimos quas similique debitis totam aspernatur. Dolorem ad odio blanditiis qui sequi velit vero molestias repudiandae?
Title 2
subtitle
Lorem, ipsum dolor sit amet consectetur adipisicing elit. Nulla ad asperiores deserunt placeat eum dignissimos quas similique debitis totam aspernatur. Dolorem ad odio blanditiis qui sequi velit vero molestias repudiandae?
BGP Bangladesh (2026)
- A hobby project to visualize and analyze how Bangladesh is connected to the global internet and the gateways traffic flows through
- Explores BGP routing data to map Bangladesh's international connectivity
- Visualizes the path internet traffic takes from Bangladesh to the global internet
Card Vault - PCI DSS Compliance (2025)
- Implemented secure vault service for PCI DSS compliance with secret-sharing mechanisms
- Coordinated with auditors on network infrastructure and software architecture
- Set up mTLS, Tokenization, Public Key Encryption (PKE), and Network Segmentation
- Handled 5,000+ daily transactions securely across 140+ Kubernetes deployments
Microservice Architecture Enhancement (2024)
- Designed and implemented gRPC-based communication between Payments and Grocery microservices
- Replaced inefficient polling with event-driven architecture
- Implemented channel caching, request queues and resilient error handling strategies
- Automated alarms for failed communication attempts, improving system reliability and response times
Maker-Checker Refactor and Activity Log (2024)
- Refactored full codebase to support a maker-checker system for highly sensitive admin actions
- Implemented comprehensive activity logging presented in a queryable UI
- Required extensive knowledge of actor-based frameworks, frontend and backend codebase
- Configured ACL at both API and Web UI levels for enhanced security
ChaldalPay Transaction System (2023-2024)
- Built core transaction engine enabling user-to-user transfers, merchant payments, and utility payments
- Implemented wallet top-ups with automated retries, error handling, and comprehensive ACL
- Created admin panel pages for transaction monitoring and management
- Implemented rate limiting, frequency and amount-based fraud detection with approval process
- Service charge modification capabilities for business flexibility
IOT-Based Greenhouse Hydroponics System (2022)
- A Group Project of Microprocessor.
- Remotely Monitoring Sensors, Updating Greenhouse Parameters. Automated Maintanence of the System.
- 1st Prize in the Course
Student Enrollment Analysis System (2021)
- A Python, Django, MySQL Project
- A Group Project of DBMS.
- Making a Database from an excel Dataset and retrieving data to show interactive charts and tables in a website.
Website For A Band (2021)
- A PHP, Bootstrap, MySQL Project
- A Group Project of WebApp Course.
- Created a functional Website for a band that allows User, Merch, Ticket, Messages Management
Peer Support (2021)
- Created the foundations of a mental health counselling software supported by volunteers with supervisor, admin support. Using Interviews, Questionnaires, JAD Sessions. Making Usecase, Activity, Data Flow, Class, ERD, Sequence, etc. diagrams
- A Website Where people can anonymously chat and receive help from volunteers
- Supervisors And AI makes sure no illegal or inappropriate messages are exchanged
- A full report on the planning, analysis and design phases available on GitHub
- A Group Project of System Analysis Course.
Weather Forecast Website (2021)
- A PHP, Bootstrap, OpenWeatherMap Project
- A Project of WebApp Course.
- Created a website to show forecast