I help businesses streamline sales, operations, and workflows through custom CRM systems, automation solutions, and scalable SaaS platforms.

With hands-on experience in backend engineering, business automation, and system architecture, I specialize in building operational systems that reduce manual work, improve team productivity, and organize business processes efficiently.

Over the years, I’ve worked on:

• CRM & lead management systems
• Marketing & sales automation
• HRM and operational platforms
• Workflow automation tools
• Reporting dashboards & analytics
• SMS, email, and notification systems
• Scalable backend APIs & multi-tenant SaaS architecture

My core expertise includes JavaScript/TypeScript, Node.js, NestJS, GraphQL, MongoDB, Redis, and modern backend system design.

What makes my approach different is that I focus not only on software development, but also on understanding how businesses operate. I enjoy solving real operational problems through technology and automation.

I’m especially interested in the future of AI-powered business systems, intelligent automation, and scalable operational platforms that help companies grow more efficiently.

If you're looking to build or improve your CRM, internal tools, automation workflows, or SaaS systems — feel free to connect or reach out.

• CRM & Lead Management Systems — pipelines, contact management, deal tracking, and team collaboration tools
• Marketing & Sales Automation — campaign workflows, drip sequences, lead scoring, and conversion tracking
• HRM & Operational Platforms — employee, attendance, payroll, and internal process management
• Workflow Automation Tools — custom rule engines and trigger-based business logic
• Reporting Dashboards & Analytics — real-time KPIs, performance metrics, and business intelligence views
• Notification Systems — SMS, email, and in-app messaging at scale
• Multi-tenant SaaS Platforms — scalable backend architectures designed for growth

• Core:

  • Strong in JavaScript, TypeScript, Python, C++ with solid knowledge of Data Structures & Algorithms
  • Experienced in System Design, Database Architecture, and SDLC
  • Familiar with Rust for performance-critical applications

• Backend:

  • Frameworks: Node.js, NestJS, Express.js, Django
  • APIs: GraphQL (Apollo Server), RESTful API design
  • Databases: MongoDB, MySQL, PostgreSQL — schema design, indexing, optimization
  • Caching & Queues: Redis, BullMQ
  • ORMs/ODMs: Mongoose, Prisma
  • Real-time Communication: WebRTC, Socket.IO
  • Authentication & Authorization: JWT, OAuth2, RBAC, multi-tenant access control
  • Testing: Jest, Supertest (unit & integration testing)
  • Deployment & CI/CD: Docker, GitHub Actions, PM2, Nginx

• Frontend:

  • Web: React.js, Next.js
  • UI Frameworks: Tailwind CSS, Bootstrap, Ant Design, Material UI
  • State Management: Redux, RTK Query

• Back-end Developer — Winstarit (Full-time · Remote · Dhaka, Bangladesh)
  Dec 2025 – Present

  • Designed and developed scalable SaaS and CRM backend systems using NestJS microservices architecture.
  • Built secure REST and GraphQL APIs for business operations, workflow automation, lead management, and operational platforms.
  • Architected multi-tenant SaaS systems with optimized database design, modular structure, and scalable backend infrastructure.
  • Implemented authentication, authorization, RBAC, and business-specific permission systems across applications.
  • Developed automation workflows, cron jobs, event-driven processes, and notification systems to streamline business operations and reduce manual work.
  • Worked on reporting systems, marketing automation, SMS/email workflows, and operational dashboards for business process management.
  • Improved system reliability, maintainability, and performance through clean architecture, debugging, optimization, and continuous enhancements.
  • Collaborated in Agile teams with frontend, product, and business stakeholders to deliver scalable, user-focused solutions.
  • Stack: NestJS · Microservices · REST · GraphQL · Multi-tenant SaaS · RBAC · Event-driven · PostgreSQL · Agile

• Support Instructor — Ostad (Part-time · Remote · Dhaka, Bangladesh)
  Jan 2026 – Present

  • Assisted students in solving programming and software development problems during practice sessions and live classes.
  • Provided technical guidance on coding concepts, debugging, problem-solving techniques, and best practices.
  • Created quizzes, assignments, coding challenges, and live test questions to assess student understanding and practical skills.
  • Reviewed assignments and live exam answer scripts with constructive feedback and detailed evaluation.
  • Assessed student performance and awarded marks based on logic, code quality, accuracy, and problem-solving ability.
  • Conducted doubt-solving and mentoring sessions to help students strengthen programming fundamentals.
  • Supported students in programming, web development, databases, and software engineering concepts.
  • Collaborated with instructors and academic teams to improve course materials and learning experiences.
  • Stack: Mentoring · Programming Fundamentals · Web Development · Databases · Code Review · Assessment Design

• Backend Engineer — Zubion Development Solutions Limited (Contract · On-site · Dhaka, Bangladesh)
  Mar 2023 – Oct 2025

  • Designed relational database schemas and ERDs for CRM and business management systems.
  • Developed scalable backend modules using modular architecture and clean code principles.
  • Built secure and well-structured RESTful APIs following Richardson Maturity Model (Level 3) and industry best practices.
  • Worked on CRM workflows, lead management features, and business process automation.
  • Maintained and monitored backend servers to ensure system stability, reliability, and performance.
  • Collaborated in Agile development environments, delivering features iteratively based on business requirements.
  • Performed debugging, troubleshooting, optimization, and bug fixing to improve application quality and user experience.
  • Stack: Node.js · Express.js · REST APIs · PostgreSQL · MongoDB · ERD Design · CRM · Agile

• Full Stack Engineer (Intern) — Rosebud AI (Contract · Remote · United States)
  Aug 2022 – Jan 2023

  • Developed RESTful APIs following Richardson Maturity Model (Level 3) and backend development best practices.
  • Designed and managed relational databases using PostgreSQL for scalable web application functionality.
  • Built backend services and server-side logic using Node.js and Express.js.
  • Worked with MongoDB and Mongoose ODM to ensure structured data handling and data consistency.
  • Contributed to developing Single Page Applications (SPA) using React.js.
  • Assisted in debugging, troubleshooting, and fixing application issues to improve system stability and performance.
  • Worked with Docker for containerization and development environment consistency.
  • Collaborated with the development team in delivering web application features and maintaining backend systems.
  • Stack: Node.js · Express.js · React.js · PostgreSQL · MongoDB · Mongoose · Docker · JavaScript

• Cell: +8801787317444
• WhatsApp: +8801787317444
• Email: kashem3091@gmail.com
• GitHub: engrkashem
• LinkedIn: Mohammad Abul Kashem