Muhammed Aqib Shahzad (Chattha)

Full-time · Pakistan · On-site

Backend engineering on payment and billing platforms — real-time rails, high-volume batch pipelines, caching architecture and database performance. Promoted from Associate Engineer to Software Engineer.

• Improved Credit Card Payment Distribution from 30–40 minutes per execution to 6–8 minutes, through range-based processing, card-hierarchy grouping, controlled batching and bounded parallelism.
• Implemented parsing and validation for US Federal Reserve FedNow ISO-20022 messages, and documented 3,000+ parameters with valid values and semantic descriptions.
• Worked on Payment Hub, enabling network integrations for financial institutions and FinTechs across Spring Boot microservices.
• Built a pending-payment scheduler and day-end reconciliation services for payment service providers.
• Extended CCPD and bucket distribution with un-adjustment logic for near real-time payment processing.
• Implemented platform-level concerns: rate limiting, AOP cross-cutting, schema validation and centralized configuration.
• Integrated agentic AI (Intello) and IBM Watson for automated customer service and real-time AMI event handling.
• Reviewed and refactored 800+ KLOC, improving structure, maintainability and performance.
• Wrote automated tests and agent-friendly context files for large web-based modules.

Java · Spring Boot · Kafka · Redis · JCS · Informix · SQL

Full-time · United Arab Emirates · Remote

Enterprise jewellery management platform — performance, architecture and new business modules.

• Cut application startup time from 30–40 seconds to 5–10 seconds by reworking lazy loading and data access.
• Reduced application size 25–30% via reusable UI components and a unified POS module.
• Implemented KYC authentication and an end-to-end manufacturing module.

C# · .NET · MSSQL · WPF

Freelance · Remote

End-to-end software delivery for clients across 20+ countries.

• 100% completion rate over 3 years 8 months.
• Owned full project lifecycles — scoping, delivery and client communication.

C# · .NET · Java · Python · SQL

Part-time · Lahore, Pakistan · On-site

Programming Fundamentals and Object-Oriented Programming labs.

• Ran hands-on lab sessions and guided problem-solving for undergraduate students.
• Clarified core OOP concepts and helped students implement practical assignments.

C++ · Java

i2c Inc.

Release 25.12 (Engineering) · also placed in the Top Ten

i2c Inc. · Annual General Meeting 2025

For work on Payment Hub, Agentic AI (Intello), CCPD and Bucket Distribution

Quaid-i-Azam University, Islamabad

A credit-card payment distribution cycle taking 30–40 minutes per execution, rebuilt around range-based processing, card-hierarchy grouping and bounded parallelism.

Java · Spring Boot · SQL · Informix  ·  aqibchattha.com/work/payment-distribution-engine

Parsing and validation for US Federal Reserve FedNow ISO-20022 messages, plus the parameter specification that made the implementation reviewable.

Java · Spring Boot · ISO-20022 · XML Schema  ·  aqibchattha.com/work/fednow-iso20022

A two-level caching architecture that cut database dependency on the hot path while keeping a single, well-defined invalidation story.

Java · Spring Boot · Redis · JCS · Kafka  ·  aqibchattha.com/work/payment-hub-caching

A horizontally scalable master/worker pipeline for generating large billing RAW files, designed so throughput is a function of worker count.

Java · Spring Boot · SQL · Docker  ·  aqibchattha.com/work/billing-invoice-engine

An enterprise jewellery management platform that took over half a minute to open, traced to eager loading and duplicated UI, then rebuilt around lazy loading and shared components.

C# · .NET · MSSQL · WPF  ·  aqibchattha.com/work/dotnet-startup-optimisation

BSc in Computer Science · CGPA 3.106

Centralised Test for IT Graduates — Rank 227, 97.0 percentile