Kunal Kejriwal | Building Backend Platforms

Build scalable backends

I am a Backend Software Engineer with 2+ years of experience designing and building scalable, high-performance backend systems and RESTful APIs using Java and Python. I specialize in backend architecture, asynchronous processing, and performance optimization for data-intensive applications operating at scale.

Core Focus: Backend Systems • REST APIs • Scalable Architectures • Performance Engineering

ABOUT ME

I am a Backend Software Engineer currently working at Deloitte USI, where I contribute to the core backend architecture of a cloud-based Organizational Change Management platform serving 150+ global clients. My work focuses on building reliable backend services, optimizing performance, and handling large-scale data processing under strict platform constraints.

I have hands-on experience designing REST APIs, implementing authentication and authorization mechanisms, building asynchronous and batch-processing pipelines, and optimizing data access layers. I enjoy working on backend problems that require careful system design, scalability thinking, and clean, maintainable code.

Meet Kunal

Skills

Languages

  • Java
  • Python
  • Apex

Core Backend Concepts

  • RESTful API Design
  • Authentication & Authorization
  • Rate Limiting & Pagination
  • Asynchronous & Batch Processing
  • Backend Performance Optimization

Backend Frameworks

  • Spring Boot
  • Django REST Framework
  • FastAPI

Cloud & DevOps

  • Google Cloud Platform (GCP)
  • Docker
  • Git

Work Experience

Associate Engineer — Deloitte USI

Oct 2023 – Present | Gurugram, India

Contributed to the core backend architecture for a proprietary, cloud-based Organizational Change Management platform used by 150+ global clients.

  • Designed and implemented high-throughput RESTful API solutions, focusing on core scalability principles.
  • Engineered asynchronous batch-processing pipelines to reliably process 20+ million records per day, with scalability to ~30 million records under strict API and platform limits.
  • Optimized backend data retrieval and processing logic, reducing API response and data transfer time by ~35%.
  • Collaborated on JavaScript-based LWC components to integrate frontend workflows with backend APIs, managing component lifecycle hooks and data binding.
  • Enhanced backend observability with structured logging and diagnostics for faster production issue resolution.
  • Worked closely with Product Managers and stakeholders to analyze requirements, assess technical feasibility, and define backend behavior aligned with product goals

Project intern – deepvision

Jan 2023 – June 2023| Gurugram, India

  • Contributed to backend data pipelines for a number plate recognition system supporting semantic segmentation workflows.
  • Gained exposure to Generative AI systems, including prompt engineering and backend integration of AI outputs.