Tushar Kalsi

About Tushar Kalsi

As a backend engineer with 4+ years of experience, I specialize in building…

Experience

1. Software Engineer

   airtel

   Jun 2023 — Present · Gurugram, IN

   At Airtel X Labs, I work as a Backend Engineer, building scalable, high-performance platforms that support mission-critical telecom and fintech services used by millions of users.Key Contributions:🧠 Deduplication Engine:Designed and implemented a deduplication platform for Postpaid, Broadband, and Regulatory connections, leveraging Python (Pandas) for large-scale data preprocessing and Golang for concurrent ingestion and similarity comparison (Levenshtein-based clustering). Achieved ~30% reduction in duplicate SIM entries, improving identity resolution and reducing operational overhead. Golang Microservices Development:Built fault-tolerant microservices for real-time SIM lifecycle management, including activation, provisioning, recharge tracking, fraud detection, and user segmentation. Integrated with PostgreSQL, Redis, and Kafka to handle high-throughput transactional data pipelines. Rust Optimization & Rewrites:Refactored performance-critical components in Rust, including modules for encryption, token management, and access control. Improved data fetch latency by 20%, ensured memory safety, and reduced security vulnerabilities in legacy systems.🧩 Cross-LOB Architecture:Contributed to backend systems supporting multiple lines of business (LOBs) like Broadband, Postpaid, and DTH, enabling consistent customer data handling and deduplication logic across the board. Monitoring & Observability:Integrated custom metrics and logs for batch pipelines and APIs using Prometheus and Grafana to monitor deduplication accuracy, processing time, and failure rates.

Education

• Blue Bells Public School

  Matriculation

  2015 — 2017

• National Institute of Technology Kurukshetra

  Bachelor's degree, Electrical and Computer Engineering

  2019 — 2023

• DAV Public Sr Sec School (Naraingarh) Ambala

  High School

  2017 — 2019