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Working in the fintech industry, designing, and developing platforms for more than eight years, gained proficiency in designing, building scalable systems with agility. Passionate to apply my acquired engineering knowledge and solve critical problems which will add value to society and help people to have a better life.

• Languages & Frameworks: Java, C, Spring, JPA, Hibernate, SQL, Oracle, MySQL, NoSQL, DynamoDB.
• Technology & Tools: Redis, RabbitMQ, Undertow, Mosquitto, F5, Switch.

• Dev Tools: Gradle, Maven, Docker, Git.

• Monitoring: ELK, APM, Prometheus, Grafana, Ansible, Jenkins.

• Payment: EMV, Payment GW, Payment Processor, POS, Accounting.

• Security: Smart Card, Tokenization, HCE, HSM, Cryptography.

• Specifications: ISO/IEC-7816, ISO-8583, PCI/DSS, ISO-9564, PKCS7, PKCS11.

• Interest: SoftwareDesign, MicroServices, CloudComputing.

• Soft Skills: Teamwork, planing and execution, learn and adapt.

bKash Limited, Dhaka, Bangladesh
Principal Engineer (Nov. 2021 – Present.)
bKash is the largest MFS (mobile financial service) company in Bangladesh.

• Understand the complex and proprietary payment system of bKash. Analyze system bottlenecks of the existing architecture.
• Working on some legacy services to convert them to reactive architecture for performance improvement.

Kona Software Lab Ltd., Dhaka, Bangladesh
Principal Software Engineer (Sept. 2013 – Nov. 2021)

Kona Software Lab Ltd (KonaSL), the R&D Center, and the Global Solution Business Wing of KONA I.

• Study, understand and implement specifications on payment and security to develop payment and security services.
• Worked as tech lead of development team (4~11 members) for several projects in planning, developing, and delivering the project requirements within the timeline.
• Worked on the system design team for Kona Pay Platform, NexusPay, DFS, and developed account and transaction authorization modules of the core platform. Tested and Optimized the modules to scale up to 250 real-time financial transactions per second and 20M transactions per day.
• Analyzed client requirements and implemented them to fit into the product.
• Monitor system performance on production and optimize to achieve the targeted goal.
• Guided the team to resolve critical production issues to meet the SLA.

Tech Lead & Software Designer

The platform provides end consumers a unified digital environment to support an engaged user-base to avail payment. Along with other payment services, it supports the USSD channel, virtual card, reward management, promotion, back-office batch processing, several web portals, and other value-added services to support business.

• Tech Lead
• Designed & developed core Accounting and Payment modules of the platform.
• Monitor, optimized and tested for performing 20M real-time transactions per day. Tested system with 50M (1.5M active) users among them.
• Improved processing time for back-office transaction reporting, clearing & settlement batch data processing (50M) from 14 to 5 hours).
• Monitor system performance and optimize for performing 60M transactions per day in RDB.
• Designed application deployment architecture for the private data center. Also implemented automatic deployment with Ansible with zero downtime.

Technology Java, Spring, Oracle, Redis, RabbitMQ, MicroServices, Undertow, Safenet, ELK, Grafana, Elasticsearch, Prometheus, ISO-8583, ISO-9564, PCI/DSS.
Website: Digital Financial System || nagad.com.bd

Tech Lead & Software Developer

NexusPay is a digitized payment platform for the existing bank accounts, credit/debit cards, Mobile banking, and Agent Banking accounts of Dutch-Bangla Bank Ltd, Bangladesh. This project is a customized variant of Kona Pay Platform for Bank Integration.

• Integrated 4 bank accounting and issuing systems for payment cards.
• Collaborated project team consisting of 18 programmers and led 3 programmers as tech-lead.
• Support multiple payment & transaction methods (e.g. NFC, POS, HCE, EMV QR, e-com, utility, bill, ATM etc.).
• Contributed as a system designer, implemented core authorization modules and POS applications on Ingenico and Nexgo devices for contactless payment.
• Prepared app servers and deployed in Bank data center with compliance of regulatory, high availability, and option to scale up.

Technology Java, Spring, Oracle, Redis, RabbitMQ, MicroServices, ATM, POS, EMV QR, NFC, Thales, ISO-8583, ISO-9564, PCI/DSS.
Website: NexusPay

Software Developer & System Designer Kona Card is a prepaid card service, popular in South Korea. It has been designed on HCE & tokenization platform KonaPay, enabled secured payment in smartphones, POS, web, smart-card, and other channels.

• Design & developed User Management and Remote Payment Gateway module of this core platform. Also, took part in the architecture designing of core KonaPay modules.
• Developed a continuous delivery process with Jenkins and Virtual box.

Technology Java, Spring, Hibernate, Oracle, Redis, RabbitMQ, MicroServices HCE, HSM, ISO-8583, ISO-9564.
Website: konacard.co.kr

Software Developer

Tool to test personalized Payment(EMV) cards before issuing to users if different data and security module is working according to the specifications of payment brands( e.g. VISA, MASTERCARD, AMEX, etc.)

• Studied specifications, designed and developed, tested, implemented reporting modules to support new payment brands.

Technology Java, SmartCard, EMV, VISA, MASTERCARD, AMEX, ISO-7816.
Website: emv-verification-tool-k-evt

Software Developer

Desktop application aimed to customize and issue payment cards to customers at the bank branch at once.

• Study specifications, design, and develop to support new payment brands.
• Integrated Hoodo machine.

Technology Java, SmartCard, EMV, VISA, MASTERCARD, AMEX, KonaCard ISO-7816.
Website: instant-issuance-system-k-iis

Software Developer To perform cryptographic operation securely, HSM (Hardware Security Module) is used, which is accessed by KMS through simple generic APIs hiding hardware complexities.

• Worked on customization of the module and HSM integration.

Technology Spring, MyBatis, MySQL, Oracle, HSM, Safenet, Thales, PKCS11.

Consaultant and System Designer

DHAKA NEXT platform replaces the standard physical race with a virtual one to empower active and aspiring athletes to maintain their fitness even in Covid-19.

• Consulted to design and integrate race platform with fitness data provider (Strava, MapMyRun). Throttled third-party paid API calls to reduce cost.
• Defined race policy services and consulted for server load maintenance at race time.
• Designed, Tested, and optimized system for 5K people to participate in a single race.

Technology PHP, MYSQL, Laravel, Wearable.
Website: next.dhakarunlords.com

Master of Science (M.S.) in Computer Science and Engineering
University of Dhaka, Bangladesh (2013-2015)

Bachelor of Science (B.S) in Computer Science and Engineering, Bangladesh (2012)
University of Dhaka, Bangladesh (2009-2013)

An Efficient Approach for Mining Frequent Patterns over Uncertain Data Streams
International Conference on Tools for Artificial Intelligence (ICTAI)
November 6-8, 2016 at San Jose, California, USA.

Photography and Traveling.
Flickr