Aajahid

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Abdullah Al Jahid

Senior Software Engineer / Team Lead

Dhaka, Bangladesh

abdullah.al.jahid@gmail.com

+880 1724707969

LinkedIn · GitHub

Professional Summary

Senior Software Engineer and Technical Lead with deep expertise in TypeScript, React, Node.js, C#, and F#. Early core engineer at Chaldal (YC S15), Bangladesh's largest online grocery platform, where I built the primary web and mobile applications from the ground up and currently lead the Payments & Integrations team.

Track record of shipping high-traffic, production-grade systems, from customer-facing React/React Native apps to secure payment gateway microservices compliant with Bangladesh Bank and PCI DSS standards. Hands-on architect who codes daily, mentors engineers, and drives technical decisions across frontend, backend, and infrastructure.

Professional Experience

Chaldal.com (YC S15)

2016 - Present

Team Lead, Payments & Integrations

Jun 2024 - Present
  • Building a full PSP (Payment Service Provider) platform with a 5-engineer team, converting ambiguous regulatory requirements into shippable, compliant product features.
  • Delivered 3D Secure for international cards, reducing fraudulent attempts by roughly 90% and unlocking global payment acceptance.
  • Architected a multi-layer automated eKYC system with liveness, OCR, and face match for Chaldal Pay, designed to eliminate manual verification and lower fraud risk.
  • Designed scalable, HA-ready payment gateway microservices with reliable sync across multiple financial APIs, including bKash, Nagad, and card networks.
  • Led technical preparedness for Bangladesh Bank licensing and PCI DSS, passing all major compliance checkpoints.
  • Fixed long-standing legacy payment bugs, recovering significant revenue leakage.
  • Coordinated directly with banks and PSPs to ensure uninterrupted transaction flow in a security-critical environment.

Senior Software Engineer

Jul 2016 - May 2024
  • Architected and developed the core Chaldal.com frontend (React + TypeScript), creating a hyper-responsive UX used by millions of customers.
  • Built the React Native mobile app and established the mobile engineering pipeline, including CI/CD, OTA updates, and release processes.
  • Created a proprietary cross-platform framework (F# + React) enabling business-logic reuse across Web, Android, and iOS, reducing duplicate code by more than 40%.
  • Rebuilt critical payment modules with F#, improving reliability and reducing failures across providers including bKash, Nagad, PortWallet, and Braintree.
  • Contributed across backend systems for HR, purchasing, logistics, routing, and warehouse operations, unblocking teams and strengthening platform architecture.
  • Defined frontend engineering standards for Clean Code, TDD, and React architecture, mentoring 20+ engineers and raising code quality across the organization.
  • Delivered core components for distributed logistics systems, improving order accuracy, tracking reliability, and operational transparency.

Earlier Career

2010 - 2016

Founder & Lead Developer, Dwetech

  • Founded and ran a software agency, building and shipping 50+ web applications using PHP/Laravel, JavaScript, MySQL, and jQuery, managing the full SDLC from requirements to production.
  • Recognized as BASIS Freelancer of the Year (2011), a national award for excellence in software export. Featured in Al Jazeera, Daily Star/AFP, and national TV.

Technical Skills

Languages TypeScript, JavaScript (ES6+), C#, F#, Python, SQL, HTML5, CSS3

Frontend React, React Native, Next.js, Redux, MobX, Tailwind CSS, Webpack, Vite

Backend & Data Node.js/Express, .NET (C#/F#), REST APIs, GraphQL, SQL Server, PostgreSQL, Redis

Infrastructure & DevOps Docker, Kubernetes, Azure DevOps (CI/CD), Azure Cloud, Git, Linux, Nginx

Architecture Microservices, Distributed Systems, Event-Driven, HA/Scalability, Domain-Driven Design

Practices & Quality TDD (Jest, xUnit, RTL), Code Review, Agile/Scrum, Observability, Security (PCI DSS)

Education & Recognition

Continuous Learning

Self-directed engineer with a strong track record of mastering complex paradigms: Functional Programming (F#), Distributed Systems, Payment Security (PCI DSS), and modern frontend architecture. Active learner through open-source contribution and hands-on engineering.

Awards & Media