Gunbilegt Byambadorj, Developer in Sydney, New South Wales, Australia

Gunbilegt Byambadorj

Database Engineer and Developer

Sydney, New South Wales, Australia
Toptal Member Since
February 8, 2022

Gunbilegt is a data engineer with 10+ years of industry experience in software, web, and database development. He specializes in building data warehouses, pipelines, and models using SQL, Python, C#, Spark, Hadoop, and .NET. Gunbilegt has worked in oil and gas, minerals and mining, telecommunications, CRM, and eCommerce. He is currently a Hadoop developer with Tata Consultancy Services, and his industry experience is backed by a master's degree in information technology.

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Tata Consultancy Services
Hadoop, Cloudera, Data Pipelines, Data Lakes, BI Reporting, Data Engineering...
Abyss Solutions
Amazon Web Services (AWS), MongoDB, React, FastAPI, Python, Amazon S3 (AWS S3)...
Ernest Fleming Machinery & Equipment Pty Ltd
C#.NET, PostgreSQL, Docker, Metabase, Serilog, Sentry, Microsoft SQL Server...


Sydney, New South Wales, Australia



Preferred Environment

Spark, Hadoop, .NET

The most amazing...

...solution I delivered recently was fixing the root cause of frequent deadlocks in a billing system database for a telecom company.

Work Experience

2021 - PRESENT

Hadoop Developer

Tata Consultancy Services
  • Built a data pipeline that automated the load of analytics reports using Cloudera Hadoop distribution.
  • Migrated legacy reports to the data lake, which enabled self-service BI reporting.
  • Configured Cloudera to automate the pipeline process.
Technologies: Hadoop, Cloudera, Data Pipelines, Data Lakes, BI Reporting, Data Engineering, Databases, Data Modeling
2021 - 2021

Data Operations Engineer

Abyss Solutions
  • Built a task management tool for the data tagging team using React, MongoDB, and FastAPI.
  • Reduced the onboarding process from one month to one week by documenting the data operations.
  • Performed ETL operations for data processing using AWS S3 and AWS Batch.
Technologies: Amazon Web Services (AWS), MongoDB, React, FastAPI, Python, Amazon S3 (AWS S3), AWS Batch, ETL, Data Engineering, Databases
2018 - 2021

Software Developer

Ernest Fleming Machinery & Equipment Pty Ltd
  • Built a business application that manages inquiries, quotations, invoices, purchases, and the inventory management process using .NET and Microsoft SQL Server.
  • Reduced quotation time from one hour to five minutes and improved business efficiency.
  • Built sales reports using the Metabase BI tool, making it easier to track sales goals.
Technologies: C#.NET, PostgreSQL, Docker, Metabase, Serilog, Sentry, Microsoft SQL Server, .NET, Business Intelligence (BI), Databases, BI Reporting, Data Modeling
2017 - 2018

Data Quality Services Lead

Rio Tinto
  • Led a team of eight to improve SAP data quality globally across all business units.
  • Built an internal data pipeline using Python, Luigi, Postgres, AWS EC2 and S3, and Redshift.
  • Automated monthly manual jobs and reduced ETL duration from 24+ hours to less than six hours.
  • Reduced the weekly ETL process from 48+ hours to less than 12 hours.
Technologies: SAP, BackOffice Cransoft, SQL, Amazon Web Services (AWS), Redshift, Luigi, Python, Team Leadership, Data Pipelines, Amazon EC2, ETL, Automation, Amazon S3 (AWS S3), Data, Databases, Data Engineering, Data Modeling
2015 - 2017

Analyst Report Developer

Rio Tinto
  • Developed reports using SAP Business Warehouse and BEx Query Designer.
  • Monitored ETL processes and ensured on-time completion of all the steps.
  • Won an award in 2015 for being the most supportive member of the year.
Technologies: SAP Business Warehouse (BW), SQL Server 2016, SQL, BI Reporting, BEx Reporting, Data Queries, ETL, Databases, Data Modeling
2013 - 2014

Senior Software Developer

Unitel Group
  • Led the data warehouse project, introduced Oracle Data Integrator for ETL, and created data marts for reporting.
  • Spearheaded an initiative to build automated operational reporting and enable an ad hoc analytics system.
  • Integrated a convergent billing system with existing systems.
  • Revamped the legacy reseller system with AngularJS and PHP.
Technologies: C#, PHP, Oracle, SQL, DevExpress, AngularJS, Automation, Data Warehousing, Oracle Data Integrator (ODI), ETL, Data Marts, BI Reporting, Leadership, Databases, Data Engineering, Data Modeling
2011 - 2013

Software Developer

Unitel Group
  • Developed business applications that managed business operations.
  • Developed modules for the call center ticket management system, CRM, and corporate relations.
  • Reduced the user acquisition cost by developing a CRM module to improve business efficiency.
Technologies: C#, .NET, DevExpress, Oracle, SQL, Customer Relationship Management (CRM), Data Modeling

Experience Scraping
A web scraping project to scrape using Scrapy. For eCommerce, It can be used to create a report on competitors' pricing and stay competitive in the market. I built this as a personal project to gain experience with Scrapy.



SQL, C#.NET, Python, C#, PHP


Databases, MongoDB, PostgreSQL, Redshift, SQL Server 2016, Data Pipelines, Data Lakes, Amazon S3 (AWS S3), Microsoft SQL Server


Data Analytics, Data Modeling, Data Engineering, Big Data, Machine Learning, Deep Learning, FastAPI, Metabase, Serilog, SAP, SAP Business Warehouse (BW), DevExpress, Web Scraping, BI Reporting, Team Leadership, Data Queries, Data Warehousing, Data Marts, Leadership, Customer Relationship Management (CRM), Data


.NET, Hadoop, Spark, AngularJS, Scrapy


React, Luigi


Cloudera, Sentry, BackOffice Cransoft, AWS Batch, BEx Reporting


Agile Project Management, ETL, Business Intelligence (BI), Automation


Amazon Web Services (AWS), Docker, Oracle, Amazon EC2, Oracle Data Integrator (ODI)


2018 - 2020

Master's Degree in Information Technology

The University of Sydney - Sydney, NSW, Australia

2006 - 2010

Bachelor's Degree in Computer Science

Dickinson State University - Dickinson, ND, USA