Rajwan Ullah

Senior Software Engineer

Pivotly

2025-07 – Present

• Developed key components of a node-based AI workflow builder using React Flow, improving usability of automation design. • Co-developed a distributed API execution engine to handle complex, multi-step workflows. • Implemented and optimized Bull-based queue systems for asynchronous job processing and fault tolerance. • Contributed to a modular connector framework for third-party integrations, enabling scalable and reusable connections. • Supported implementation of advanced workflow capabilities including branching logic, retries, and concurrency handling. • Monitored application and Bull queue logs to troubleshoot workflow failures and improve system reliability.

Senior Software Engineer

Silicon Orchard LTD

2022-02 – 2025-06

• Led end-to-end development of 5+ enterprise applications serving thousands of users across streaming, IoT security, CRM, payroll, and e-commerce platforms • Led the design and development of core system modules and mentored junior developers while collaborating on system architecture. • Architected and built a real-time IoT tracking and vehicle security platform from the ground up, developing and maintaining 100+ REST API endpoints serving thousands of daily requests. • Developed modern frontend applications with React, Next.js, and Vue.js, improving performance and SEO • Implemented real-time messaging and notification systems supporting thousands of concurrent users. • Reduced technical debt and improved application performance by refactoring legacy modules and optimizing database queries.

Senior Software Engineer

Nanoit World

2019-12 – 2022-01

• Developed multi-vendor and single-vendor e-commerce platforms with custom CMS, real-time chat, push notifications, wallet, refund, & secure payment features. • Built scalable REST APIs, integrated 6+ payment gateways (bKash,Stripe, SSLCOMMERZ, Stripe, etc.), and delivery logistics through eCourier. • Designed and optimized MySQL schemas and queries, and monitored application logs to troubleshoot production issues and ensure system reliability.