Gaurav Kohli, Developer in Amsterdam, Netherlands

Gaurav Kohli

Software Developer

Location
Amsterdam, Netherlands
Toptal Member Since
November 9, 2018

Since 2006, Gaurav's worked in software development as a developer, DevOps, scrum master, senior consultant, and product owner, and in those years, he's worked in a number of different domains such as eCommerce, travel, and online advertisement. While working at Booking.com, he managed the ticketing back-end system for our customer service executives (it's used to handle phone calls and emails for their million-plus customers and partners).

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Portfolio

Fleetonomy.io
Amazon Web Services (AWS), Redis, Elasticsearch, Consul, Ansible, Terraform...
Booking.com
Amazon Web Services (AWS), SQL, JPA, Git, JUnit, Kubernetes, Docker, Terraform...
Booking.com
SQL, Hadoop, Apache Hive, Perl

Experience

Java - 10 yearsBig Data - 5 yearsSpring - 5 yearsAmazon Web Services (AWS) - 3 yearsGoogle Cloud Platform (GCP) - 3 yearsTerraform - 2 yearsKubernetes - 2 yearsAWS Certified Solution Architect - 1 year

Location

Amsterdam, Netherlands

Availability

Part-time

Preferred Environment

MacOS, Terminal, Git, IntelliJ IDEA, Java

The most amazing...

...thing I've done was to lead the migration of legacy ticketing system with no downtime—it now can handle million of customers on a daily basis.

Work Experience

2019 - PRESENT

DevOps Engineer

Fleetonomy.io
  • Conducted optimization to reduce the cost of the production cluster by 50%.
  • Designed and implemented the architecture for a disaster recovery cluster.
  • Managed and supported the microservice architecture-based deployment on multiple cloud providers.
Technologies: Amazon Web Services (AWS), Redis, Elasticsearch, Consul, Ansible, Terraform, CircleCI, Python, Helm, Kubernetes, Azure, Google Cloud Platform (GCP)
2017 - 2019

Senior Developer | Team Lead

Booking.com
  • Led the general data protection regulation (GDPR) efforts for the customer service (CS) and tech/product departments.
  • Identified challenges within the department and later worked with the product team in tackling them.
  • Spearheaded data ownership and management within the department.
  • Acted as the big data ambassador for the entire customer service department and coordinated the set up of a big data community within the customer service (CS) department.
  • Supported and answered all data infrastructure related questions and topics.
  • Guided different teams in the builds of reliable data pipelines.
  • Evaluated possible solutions to replace Red Box recorders for voice tracks.
  • Introduced Druid as a real-time OLAP engine to the department.
  • Provided technical and commercial direction to team.
  • Mentored team members in their craft and soft skills.
Technologies: Amazon Web Services (AWS), SQL, JPA, Git, JUnit, Kubernetes, Docker, Terraform, Druid.io, Oozie, Spark, Apache Hive, Big Data, MySQL, Hadoop, Perl, Java
2013 - 2017

Development Team lead

Booking.com
  • Managed the rollout of 2.0 version of Ticketing, a system where agents logged in their work.
  • Took over the role of product owner for a while and led to the project of Ticketing.
  • Facilitated a close collaboration between the agent routing and the Ticketing teams.
  • Built a bridge between the analyst community and the developer who generated data for the CS department.
  • Restructured the process of doing regular one-on-one meetings with team members.
  • Headed the agent's workshop around Ticketing's phase 2.0 in order to understand how they used new flows.
  • Automated many simple procedures followed by CS executives to speed up the issue handling.
  • Worked with the CS forecasting team to build better forecasting models.
  • Created a real-time data ticketing pipeline in Kafka to be consumed by an analyst and a data scientist.
  • Explored Druid as a platform for a real-time ad-hoc analysis of CS data.
  • Introduced Druid technology for a machine-learning-scaling track.
  • Granted access to the open source community a Perl plugin for Druid.
  • Facilitated the Druid adoption in the company while working with a business reporting team to get them started with Druid.
  • Developed a CS inbound driver insightsdashboard in Druid.
  • Was awarded a "Bloody Helpful" award within the CS department for three consecutive quarters.
Technologies: SQL, Hadoop, Apache Hive, Perl
2012 - 2013

Back-end Developer

eBuddy.com (Amsterdam)
  • Developed an eBuddy XMS internet scale mobile messaging platform.
  • Worked as part of a cross-functional Agile team, developing all aspects of the product.
  • Researched upon various solution possibilities to a problem and then implemented it.
Technologies: Servlet, Hibernate, Jenkins, JUnit, Mockito, Spring, MySQL, Java
2011 - 2012

Senior Consultant

Xebia (Amsterdam)
  • Conducted requirement gathering and interacted with the users.
  • Developed custom Atlassian plugins in Jira/Confluence for team’s specific requirements.
  • Consulted on Agile tool selection to help the product and operations teams get aligned with Scrum and Kanban.
  • Advised and helped the sales and marketing teams to move their workflow management in Jira.
  • Created and implemented upgrades and rollout plans for various Atlassian products.
  • Evangelized various teams, in Gumtree (Australia), Kijiji (Italy), and Mobile.de (Germany), into using ECG’s Atlassian tool ecosystem.
Technologies: Jira, Atlassian, Java
2009 - 2011

Consultant | Scrum Master

Xebia (India)
  • Built the back end, handling all of the data and enrichment processes.
  • Designed and implemented user stories.
  • Wrote unit and functional tests.
  • Contributed to the planning, iteration kickoffs, and retrospectives.
  • Coordinated the backlog creation and regular prioritization of stories in the backlog with the product owner.
Technologies: Servlet, Git, Hibernate, SQL, Spring Integration, Spring, JUnit, Java
2007 - 2009

Senior Developer

GlobalLogic
  • Contributed to the creation of the entire Acteva application (three modules) on a J2EE stack which eventually replaced the old Acteva ColdFusion-based application.
  • Developed a class module which included concepts such as instructor, training venue, and attachments.
  • Built a report module for the generation of money-related event reports and the list of attendees.
  • Created a refund module which handled the entire refund request made by the attendees of the event.
Technologies: Apache Tomcat, JPA, JUnit, SQL, Seam, Java
2006 - 2007

Developer

GlobalLogic
  • Developed a reporting module for the transactional database of OpenAds.
  • Built a generic report module for generating basic reports based on filters and parameters.
  • Developed a forecasting module which included revenue and revenue forecasting of their campaigns.
  • Created a module for generating unique user reports and CPM (cost per million) campaign tracker reports.
Technologies: Apache Tomcat, JPA, JUnit, SQL, Seam, Java

Experience

Perl Client for Druid.io

https://github.com/gauravkohli/Druid
At Booking.com, we heavily use Perl for development so I wrote this Perl client for Druid.io (a high-performance analytics data store for event-driven data). By using this, it becomes really easy to get data from the Druid store.

Rules with Drools

https://www.slideshare.net/falcondot/rules-with-drools-9995827
Here, you can see the slides I used when I presented Drools, a business rule management system at a conference called OSS Camps in 2009.

Data Engineering on the Google Cloud Platform

https://www.credential.net/4wt52jwt
This is an introduction to designing and building data processing systems on the Google Cloud Platform. Participants will learn how to design data processing systems, build end-to-end data pipelines, analyze data and carry out machine learning. The course covers structured, unstructured, and streaming data.

Breaking with Relational DBMS and Dating with Hbase

In 2010, I gave a presentation on a comparison between HBase and a relational DBMS (database management system) at the IndicThreads.com conference.
Image of Zero Downtime Jenkins Continuous Deployment with Terraform on AWS publication
Publication

Zero Downtime Jenkins Continuous Deployment with Terraform on AWS

https://www.toptal.com/devops/terraform-jenkins-continuous-deployment

Skills

Languages

Java, Perl, JavaScript, SQL, Python, HTML

Frameworks

Spring, Mockito, Spring Security, Spring Boot, Bootstrap, Angular, Hadoop, Spark, JPA, Spring Integration, JUnit, Apache Struts 2, JSON Web Tokens (JWT), Apache Spark, Hibernate, Seam

Paradigms

DevOps, Test-driven Development (TDD), Kanban, Continuous Integration (CI), REST, Continuous Delivery (CD), Unit Testing, Agile Software Development, Clean Code

Platforms

Amazon Web Services (AWS), Docker, MacOS, Android, Kubernetes, Azure, Google Cloud Platform (GCP)

Storage

Apache Hive, Redis, Druid.io, MySQL, Elasticsearch, SQL CE

Libraries/APIs

Apache Lucene

Tools

Terminal, Servlet, Atlassian, Jira, Apache Tomcat, Helm, CircleCI, Ansible, Google Cloud Composer, Jenkins, Oozie, Apache Airflow, Cloud Dataflow, Google Cloud Dataproc, GitLab CI/CD, GitLab, GitHub, IntelliJ IDEA, Docker Hub, Git, Terraform

Other

Consul, Big Data, Progressive Web Applications (PWA), Streaming Data, Ajax, AWS DevOps, AWS Certified Solution Architect

Education

2002 - 2006

Bachelor's Degree in Computer Engineering

Indian Institute of Information Technology - Allahabad, India

Certifications

MARCH 2020 - MARCH 2023

AWS SysOps Administrator — Associate

Amazon Web Services

JANUARY 2020 - JANUARY 2023

AWS Developer Associate

Amazon Web Services

DECEMBER 2019 - DECEMBER 2021

Google Cloud Certified — Associate Cloud Engineer

Google Cloud

JULY 2019 - JULY 2022

AWS Solution Architect Associate

Amazon Web Services

JANUARY 2013 - PRESENT

DataStax Certified Cassandra Developer

DataStax