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Balaji Kolli

Fullstack Engineer / Web Developer • Hyderabad, India • b**************@gmail.com • +91*******752 • linkedin.com/••••• • balajikolli.in/•••••

Professional Summary

Fullstack Engineer with 4.6 years of experience building enterprise web applications using React.js, Next.js, TypeScript and Node.js. Strong background delivering reusable component libraries and API-driven front-ends for large clients while working at an IT services firm. Experienced in state management with Redux Toolkit and React Query, and in writing unit and integration tests with Jest and React Testing Library. Proven track record optimizing Core Web Vitals and page performance through code-splitting, image and bundle optimization, and webpack tuning. Hands-on with production support, root-cause debugging, and CI/CD automation using Git and Azure DevOps. Comfortable owning feature lifecycles from requirements and design through testing and deployment in Agile teams.

Technical Skills

Programming Language: TypeScript
Frontend Technologies: React,Next.js,Material UI,Redux Toolkit,Context API,React Query,Hooks,WCAG,Core Web Vitals
Backend Technologies: Node.js
Version Control & Development Tools: Git,GitHub
DevOps & Infrastructure: Azure DevOps,Continuous Integration,Continuous Deployment
Testing & QA: Jest,Testing Library
API & Integrations: RESTful APIs
Project Management & Collaboration: Agile

Work Experience

Infosys Ltd.
Hyderabad, India
Frontend Developer (Systems Engineer)
Jan 2025 – Present
Worked at an IT services company delivering enterprise web applications; focused on front-end and full-stack integrations for client-facing business systems.
Tech Stack: React.js, Next.js, TypeScript, React Query, Jest, React Testing Library, Azure DevOps
  • Architected a reusable TypeScript component library in React to standardize UI patterns and accelerate feature development across multiple enterprise modules.
  • Implemented Next.js server-side rendering and route-level code-splitting to improve SEO and initial render performance for customer-facing pages.
  • Optimized Core Web Vitals by applying code-splitting, caching strategies and image optimization, reducing page load time by 30%.
  • Integrated REST APIs and implemented client-side caching with React Query to reduce redundant network requests and improve responsiveness.
  • Wrote unit and integration tests for key UI modules using Jest and React Testing Library to prevent regressions during frequent releases.
  • Streamlined CI/CD workflows in Azure DevOps to automate build, test, and deployment stages across staging and production environments.
Infosys Ltd.
Hyderabad, India
Frontend Developer (Senior Systems Associate)
Apr 2024 – Jan 2025
Delivered UI features and enhancements for enterprise applications in an Agile team, focusing on state management and API-driven front-ends.
Tech Stack: React.js, Redux Toolkit, Context API, TypeScript, GitHub
  • Delivered new UI features using React.js and TypeScript, following component-driven design to meet client requirements.
  • Implemented complex state flows using Redux Toolkit and Context API to support multi-step forms and synchronized client state.
  • Refactored class-based components to functional components with hooks to simplify logic and improve maintainability.
  • Improved perceived performance through lazy loading and dynamic imports, reducing initial bundle weight for core pages.
  • Hardened front-end API interactions by adding structured error handling and retry logic; validated endpoints using Postman.
  • Managed pull requests and conducted code reviews on GitHub to maintain code quality and enforce component standards.
Infosys Ltd.
Hyderabad, India
Systems Associate (Production Support)
Apr 2022 – Mar 2024
Provided 24x7 production support and maintenance for enterprise web applications, performing incident diagnosis and implementing fixes across environments.
Tech Stack: Node.js, Git, Azure DevOps
  • Investigated production incidents by analyzing server logs and browser traces to identify root causes and deploy corrective fixes in Node.js front-end integrations.
  • Implemented hotfixes and coordinated deployments with DevOps using Azure DevOps pipelines to restore service availability across environments.
  • Authored runbooks and knowledge-base articles to standardize incident response and reduce handover friction for on-call teams.
  • Conducted regression verification and cross-environment testing to confirm fixes and prevent recurrence of production defects.
  • Partnered with backend teams to resolve API contract and data consistency issues, validating endpoints with Postman.
  • Managed source control and release artifacts using Git and assisted with sprint defect triage in Jira.

Education

SSS Degree College, Parvathipuram Manyam
Bachelor of Science (B.Sc.) • Parvathipuram Manyam, India • 2018 – 2021

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