Ujjwal Agarwal

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Senior Software Engineer L1

XEBOai SurveyConnect

Apr 2025 - Current (1 year 3 months)

As a Senior Software Engineer, I focused on writing scalable and maintainable code using best pratices and engineering solutions to support millions of users. Designed and owned core backend architectures emphasizing microservices, observability, and fault tolerance. Implemented a Dead Letter Queue (DLQ) system and robust retry mechanisms to handle poison messages, improving message reliability. Led cross-functional projects integrating AI-driven automation into enterprise platforms, enhancing productivity and intelligence. Developed and optimized high-volume APIs using strategies like indexing, batching, and Redis caching, reducing response times and improving scalability. Optimized large-scale data ingestion pipelines with stream-bas

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Software Engineer L2

Xebo.ai

Apr 2024 - Mar 2025 (1 year)

Led high-impact backend and infrastructure initiatives focused on scalability, resilience, and intelligent automation. Engineered distributed microservices with Node.js, Kafka, and Redis, improving throughput by 35%. Spearheaded the zero-downtime migration of 10M+ records across MongoDB and PostgreSQL. Developed a quota enforcement and rate-limiting engine with a token-bucket algorithm to support multi-tenant systems. Integrated GenAI microservices to power intelligent automation within the platform. Enhanced large data ingestion workflows with stream-based processing, reducing memory overhead and improving reliability.

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Software Engineer L1

Jul 2023 - Mar 2024 (9 months)

Transitioned into a core engineering role, working on production-grade backend systems and full-stack features. Gained hands-on experience with Node.js, Express.js, MongoDB, and React.js for building scalable applications. Developed and optimized RESTful APIs, ensuring data integrity and performance. Built scalable APIs and microservices using Node.js, and MongoDB, improving API response times by 40% through caching and async optimization. Played a key role in migrating legacy Angular/JS applications to React and TypeScript, ensuring maintainability and modern standards. Worked on containerization using Docker.

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Technical Trainee

Jul 2022 - Jun 2023 (1 year)

As a Technical Trainee, I began my journey in full-stack development, focusing on frontend fundamentals and modern web technologies. Gained hands-on experience with React.js, Nextjs, Javascript, Typescript for building scalable applications. Developed frontend components and common services like toaster, modals etc, which were later used by other developers and also developed many frontend features including end to end ticketing platform and response page for the better data visualisation and summarization of the clients. Collaborated in code reviews, debugging, and CI/CD workflows to strengthen my understanding of end-to-end development. Contributed to internal tools and scripts that improved team productivity.

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