Summary
Overview
Work History
Education
Skills
Certification
Accomplishments
Project Clients
Languages
Work Preference
Timeline
Open To Work
Hi, I’m

K Girish

Bengaluru
K Girish

Summary

Technical Lead with 4.9+ years of experience in data engineering and DevOps, specializing in ETL/ELT pipeline development for large-scale telecom data platforms. Experienced in handling CDRs, mediation files, billing events, and fraud data within Revenue Assurance and Fraud Management systems.

Strong hands-on expertise in PySpark, Python, SQL, Pandas, and NumPy, along with Microsoft Azure, Azure DevOps, CI/CD pipelines, Docker, Kubernetes, Terraform, Git, and GitHub. Proven ability to manage production-critical systems, perform root cause analysis, and ensure high availability, performance, and data reliability across enterprise environments.

Overview

5
years of professional experience
1
Certification

Work History

Subex Limited
Bengaluru

Technical lead operations
06.2024 - Current

Job overview

  • Designed and maintained end-to-end ETL pipelines for large-scale telecom data including CDRs, mediation files, billing events, and fraud transactions.
  • Developed scalable PySpark transformation frameworks for batch and streaming data processing, enhancing data handling capabilities.
  • Built Kafka streaming pipelines for near real-time fraud detection, improving response time to potential threats.
  • Performed Spark performance tuning (partition optimization, memory tuning, executor/core configuration), improving pipeline efficiency by ~20%.
  • Implemented CI/CD pipelines using Azure DevOps, automating ETL deployments and configuration management.
  • Containerized data workloads using Docker and orchestrated execution with Kubernetes.
  • Provisioned infrastructure using Terraform, ensuring repeatable and consistent environment creation.
  • Monitored production systems and data pipelines using Grafana, reducing MTTR and improving system reliability.
  • Led production incident management and root cause analysis (RCA), streamlining change management processes and reducing downtime.
  • Used Pandas and NumPy for data validation, reconciliation, anomaly detection, and pipeline debugging.
  • Managed source code versioning using Git and GitHub, following branching strategies and pull-request-based reviews.
  • Ensured data security, access control, and compliance across telecom data platforms.
  • Collaborated with development, DevOps, cloud, and client teams for release management and operational stability.

Subex Limited
Bengaluru

Senior Software Engineer
06.2022 - 06.2024

Job overview

  • Developed and supported ETL/ELT pipelines for telecom revenue assurance and fraud management (RAFM) systems, enhancing data reliability.
  • Implemented PySpark transformations for cleansing, aggregation, enrichment, and normalization of telecom datasets.
  • Optimized SQL, Hive, and Presto queries to improve processing speed and reporting accuracy.
  • Designed and maintained custom telecom CDR decoders for client-specific data formats.
  • Created and maintained custom decoders for client-specific CDR formats, ensuring seamless data processing across various telecom environments.
  • Used Pandas and NumPy for exploratory data analysis (EDA), reconciliation checks, and post-processing validation.
  • Automated operational tasks using Python and Bash scripting in Linux environments.
  • Managed code repositories using Git and GitHub, ensuring proper version control and deployment traceability.
  • Assisted global telecom clients such as STC, PLDT, Robi, Atom, Econet, and Dhiraagu.
  • Participated in release deployments, production validations, and go-live support.Provided telecom application support for ROC Revenue Assurance Fraud Management, Hypersense platforms across multiple clients (e.g., STC, PLDT, atom, econet).
  • Addressed and resolved critical production defects, minimizing downtime through thorough testing and validation.
  • Analyzed system performance and optimized configurations for faster data throughput.
  • Facilitated client communication and produced support documentation for production handovers, streamlining transition processes.

Subex Limited
Bengaluru

Software Engineer
05.2021 - 06.2022

Job overview

  • Developed telecom data ingestion components and decoders, enhancing data processing for mediation and network-generated files.
  • Built Python-based parsers and supported PySpark ETL jobs, streamlining data transformation workflows.
  • Used Pandas and NumPy for data sampling, reconciliation, and validation reporting.
  • Worked with Git-based repositories for version control and deployment tracking.
  • Assisted in RFC/CR implementations for Revenue Assurance and Fraud Management modules, contributing to improved system compliance and accuracy.
  • Supported data quality checks and pipeline monitoring activities.

Education

T John Institute of Technology
Bengaluru

Bachelor of Engineering from Electronics & Communication Engineering
01.2020

Skills

Programming & Scripting:
Python, PySpark, SQL, Bash, Pandas, NumPy

Data Engineering & ETL:
ETL / ELT Pipelines, Batch Processing, Streaming Data Processing, Data Ingestion, Data Transformation, Data Validation, Data Quality Checks

Big Data Technologies:
Apache Spark, Kafka, Hadoop, Hive, Presto

Cloud & DevOps:
Microsoft Azure, Azure DevOps, CI/CD Pipelines, Docker, Kubernetes, Terraform

Version Control:
Git, GitHub, Azure Repos

Databases:
Oracle SQL, PostgreSQL

Monitoring & Operations:
Grafana, Production Support, Incident Management, Root Cause Analysis (RCA)

Operating Systems:
Linux, Windows

Domain Expertise:
Telecom Domain, CDR Processing, Mediation Systems, Billing Events, Revenue Assurance, Fraud Management

Certification

  • Microsoft Azure Fundamentals - Udemy
  • Azure & Cloud DevOps Fundamentals - Udemy
  • Docker and Kubernetes using Azure DevOps - Udemy

Accomplishments

  • Extra Mile Award, Robi Go-Live Support, 02/01/23
  • Agile Surfer Award, STC Project Issue Resolution, 02/01/22
  • Customer Kudos, Dhiraagu Support Excellence, 02/01/22

Project Clients

  • ROBI
  • STC Riyadh
  • Dhiraagu
  • WEBE
  • MAXIS

Languages

English
Proficient (C2)
C2
Telugu
Advanced (C1)
C1
Kannada
Advanced (C1)
C1
Tamil
Elementary (A2)
A2
Hindi
Advanced (C1)
C1

Work Preference

Job Search Status

Open to work

Work Type

Full Time

Location Preference

On-SiteRemoteHybrid

Salary Range

₹1500000/yr - ₹2500000/yr

Timeline

Technical lead operations

Subex Limited
06.2024 - Current

Senior Software Engineer

Subex Limited
06.2022 - 06.2024

Software Engineer

Subex Limited
05.2021 - 06.2022

T John Institute of Technology

Bachelor of Engineering from Electronics & Communication Engineering
K Girish