Ujjwal Kumar

Software Engineer

Saket, Delhi, India1 yr 8 mos experience

Key Highlights

Expert in building scalable microservices with Java and Spring Boot.
Proficient in AWS and event-driven architecture using Kafka.
Strong focus on clean, maintainable, and testable code.

Stackforce AI infers this person is a Backend Developer specializing in SaaS solutions with a focus on microservices and cloud technologies.

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Skills

Core Skills

JavaSpring BootKafkaWebsocketMeta Graph ApiApi IntegrationAws

Other Skills

REST APIsHibernateMySQLFirebase Cloud MessagingToken-based messagingMixpanelWATIMsg91AWS S3Cascading Style Sheets (CSS)ASP.NET CoreJava Software DevelopmentJava DevelopmentAmazon Web Services (AWS)Aspect-Oriented Programming (AOP)

About

I am a passionate and performance-driven Backend Software Developer with one year of hands-on experience at Flickd, where I’ve contributed to building scalable, high-performance microservices and backend systems. My expertise lies in designing and developing backend solutions using Java and Spring Boot, with a strong grasp of Microservices architecture, RESTful APIs, and event-driven systems using Kafka. I have practical experience working with containerized environments using Docker, deploying and managing services on AWS, and implementing WebSocket for real-time features. I’m well-versed in data persistence and ORM technologies such as JPA/Hibernate, and I work comfortably with MySQL for relational data management. I follow best practices in code versioning with Git and prioritize writing clean, maintainable, and testable code. I'm constantly learning, improving my craft, and seeking challenging opportunities where I can make meaningful contributions to product and system design. My focus is on delivering backend solutions that are robust, scalable, and efficient.

Experience

1 yr 8 mos

Total Experience

1 yr 8 mos

Average Tenure

1 yr 8 mos

Current Experience

Flickd

2 roles

SDE (Backend)

Aug 2024 – Present · 1 yr 8 mos · On-site

Architected and deployed scalable microservices with Java, Spring Boot, and Kafka, including a notification microservice consuming Kafka topics and pushing real-time updates via Firebase Cloud Messaging (FCM)— cutting internal API coupling by 70%.
Developed Instagram Comment-to-DM automation using Meta Graph API, enabling keyword-triggered personalised replies with scoped user handling, token-based messaging, and webhook-driven orchestration.
Integrated third-party APIs including Mixpanel, WATI (WhatsApp), Msg91, and OTPless, enabling omnichannel, event-based user engagement across marketing and authentication workflows.
Engineered dynamic OTP and payment flows using Strategy and Factory design patterns, enabling seamless provider fallback and reducing failure rates under API outages.
Integrated AWS S3-based media management with pre-signed URL generation, ensuring secure and high-throughput image/video uploads with minimal backend load.
Enhanced inter-service communication in a microservices architecture by optimising REST API calls and event-driven patterns, improving system efficiency and scalability.
Optimised complex DB queries and used the projection interface by isolating variant pricing, stock count, and image logic - reducing API response time up to 40%.
Standardised DTO and mapper layers across microservices for efficient, lightweight data serialisation and deserialization.
Designed scalable and flexible data models for relational databases, ensuring future-proofing and modular growth.

JavaSpring BootKafkaWebSocketAWSREST APIs+2

SDE Intern (Backend)

Jul 2024 – Jul 2024 · 0 mo · On-site

Fixed numerous bugs in the message and auth microservices.
Implemented WebSocket for real-time communication in notifications and chats, enhancing user experience.
Gained valuable hands-on experience in a fast-paced development environment.

WebSocketHibernate