Sanjoy Kumer Deb

Senior Java Developer and System Architect who worked on a large-scale Property Management System in the real estate domain. I was responsible for designing and developing core backend services and key platform components, with primary ownership of invoicing, payment processing, and other business-critical modules. During this role, I developed deep domain expertise in property management workflows, including tenant lifecycle management, billing, financial transactions, and business process automation. My f

Served as Lead Backend Engineer and Technical Lead. Owned end-to-end delivery including requirements analysis, system design, architecture, development, and production deployment for large-scale gaming and betting platforms. Provided technical leadership in designing scalable distributed systems focused on performance, reliability, maintainability, and extensibility. Defined architecture standards and guided engineering execution across multiple initiatives. Key Responsibilities • Designed and developed sca

Collaborated with multinational companies based in Switzerland, the United Kingdom, Singapore, and the United States through the Upwork platform. Worked within large, globally distributed development teams to deliver e-commerce solutions and software applications for architectural model design and manufacturing. Responsible for integrating third-party banking APIs for a Singapore-based financial services project. Key Responsibilities and Achievements • Developed and maintained scalable backend applications

Worked as a Backend Engineer in a multinational development team of 40+ engineers across China, the USA, India, Nepal, and other regions. Contributed to a large-scale enterprise corporate management system, primarily focused on hotel operations. The platform included core business modules such as HR Management, Housekeeping, Guest Management, and Payment Processing. Roles & Responsibilities • Served as a core backend engineer contributing to the design, development, and maintenance of scalable backend servi

Worked as a Backend Engineer on a Java-based freight management and tendering platform used by global enterprises such as PUMA, ADIDAS, and SPRINT for managing freight procurement and tender processes. The system was later acquired by the Alpega Group, extending its enterprise-scale adoption and integration within a broader logistics ecosystem. Roles & Responsibilities • Contributed to the core backend development team, building scalable features using Java, Spring Framework, and supporting frontend modules

Worked as a Backend Engineer in a large-scale fintech organization at Kona Software Lab Ltd., collaborating with 150+ engineers in a multinational environment. The company develops enterprise-grade payment and digital wallet solutions across multiple regions, including Kona Card (South Korea’s first e-wallet system) and MBFS (Bangladesh), supporting platforms such as Nagad and bank card personalization systems. Roles & Responsibilities • Developed backend services using Java, Spring Framework, and microserv

Worked as a core engineering contributor in a fintech environment, focusing on smart card-based payment systems and enterprise-grade backend development. Involved in requirement analysis, system design, and full-cycle product delivery using modern Java-based technologies and distributed architectures. • Analyzed and implemented technical specifications based on EMV, GlobalPlatform, Visa, MasterCard, and ISO standards for secure smart card-based payment systems. • Prepared project scope documents and deta

Contributed as a backend engineer in a fintech environment, focusing on smart card-based payment systems and enterprise backend development. Involved in requirement analysis, system planning, and development of scalable solutions using Java-based technologies and microservices architecture. • Analyzed and interpreted technical specifications based on EMV, GlobalPlatform, Visa, MasterCard, and ISO standards for secure smart card payment solutions. • Prepared project scope documents and detailed functional

Formerly known as Horoppa Infotech, a Silicon Valley–inspired Bangladeshi software company, where I began my professional career in backend and full-stack software development using Python and Java. Contributed as a backend engineer in a multicultural engineering environment, supporting the design and development of scalable software systems. Gained strong exposure to enterprise application development, distributed teams, and modern backend technologies while working on production-grade systems. Roles & Re

An innovative Bangladeshi software company where I began my professional career, collaborating with experienced and highly skilled software engineers while building a strong foundation in enterprise application development. Started my professional journey in software engineering, gaining hands-on experience in full-cycle application development, system design, and client-focused software delivery within a structured development environment. Roles & Responsibilities • Contributed to core software developmen