Shubham Kumar

Backend Engineer

Berlin, Berlin, Germany3 yrs 5 mos experience

Most Likely To Switch

Key Highlights

Two-time Google Summer of Code recipient.
Maintainer at GitLab with significant contributions.
Nominated and awarded MVP at GitLab for notable contributions.

Stackforce AI infers this person is a Backend Engineer with strong open-source contributions in SaaS environments.

Contact

Skills

Core Skills

Open-source SoftwareRuby On RailsAwsNode.js

Other Skills

PostgreSQLDatabasesRubySingle Sign-On (SSO)Microsoft AzureAmazon Web Services (AWS)TerraformTypeScriptCircleCIRspecGo (Programming Language)CIGolangOpen-Source DevelopmentKubernetes

About

I am a Backend Engineer at GitLab based out of Berlin, Germany. I've made significant contributions to the open-source community since 2019 🌐 through code contributions in organizations such as GitLab, Mozilla, Internet Archive, Chatwoot, and many others. 🚀 I am also a maintainer at GitLab (open source project). 🏆 Proud two-time Google Summer of Code recipient! In 2020, collaborated with Mozilla Firefox 🐙 to design and implement their FIDO2 web authentication system. In 2021, worked with GitLab 🦊 to enhance their backup and restore processes. 🎉 I was nominated for the prestigious MVP (Most Valuable Person) award at GitLab 🦊 for the 16.10 (March 2024) release and selected for MVP 17.1 (June 2024) release, recognizing my code contributions to the GitLab codebase. My extensive contributions to these and other projects can be viewed on my GitHub and GitLab profiles. GitHub: https://github.com/imskr GitLab: https://gitlab.com/imskr Website & Blog: https://shubham-kumar.com My open-source contributions: https://shubham-kumar.com/contributions

Experience

3 yrs 5 mos

Total Experience

1 yr 1 mo

Average Tenure

1 yr 10 mos

Current Experience

Gitlab

Backend Engineer II

Jul 2024 – Present · 1 yr 10 mos · Berlin, Germany · Remote

Part of the Tenant Scale – Organizations group, responsible for delivering large-scale application changes that enable GitLab and GitLab.com to scale to millions of users, while supporting long-term multi-tenancy, isolation, and platform scalability initiatives.
🔧 Key Contributions & Impact:
Enhanced Groups and Projects APIs, delivering new features and performance improvements across GitLab’s core platform.
🧩 Led the Organization Isolation initiative, including:
Adding sharding keys across the database layer
Designing and executing backfill migrations for 100+ tables
Strengthening GitLab’s multi-tenant architecture and data isolation strategy
🤝 Improved GitLab’s platform Groups and Projects APIs, including new features and enhancements.
⭐ Maintainer Milestone: October 2025: Became a maintainer at GitLab
📌 Before joining GitLab, my open-source contributions as a community contributor:
🗓 January 2021: First contribution to GitLab
🎓 Google Summer of Code 2021: Selected contributor under the Geo Team
🔁 25+ merge requests merged by December 2023
🏆 March 2024: Nominated for MVP (Most Valuable Person / Notable Contributor Award) – GitLab 16.10 release
🔢 June 2024: 50th merge request merged
🥇 June 2024: Awarded MVP (Notable Contributor Award) for GitLab 17.1 release

PostgreSQLOpen-Source SoftwareDatabasesRubyRuby on Rails

Babbel

Backend Engineer

Feb 2023 – Jun 2024 · 1 yr 4 mos · Berlin, Germany · On-site

Babbel is a leading language learning platform that offers courses in multiple languages. It is known for its innovative approach to language learning, which combines technology with proven teaching methods.
My work:
Migrated production database from AWS RDS postgres to Aurora Serverless V2
Designed APIs to facilitate seamless integration and meet B2B requirements.
Enhanced SCIM and SSO integrations to improve user experience and security.
Collaborated with cross-functional teams to deliver high-quality solutions that met business needs.

Single Sign-On (SSO)Microsoft AzureAmazon Web Services (AWS)RubyRuby on RailsTerraform+1

Farmako (yc s20)

Backend Engineer

Oct 2022 – Jan 2023 · 3 mos · Gurugram, Haryana, India · Hybrid

Designed and developed APIs to improve the delivery of medicine and enhance the overall user experience for patients.
Troubleshot and resolved technical issues, ensuring timely resolution of critical incidents to minimize downtime and maintain system availability.
Stayed up-to-date with emerging technologies and industry best practices, making recommendations for process improvements and new tools to increase efficiency and scalability.
Tech Stack:
Node.js
Ruby on Rails

Node.jsRuby on Rails

Bharatx

Backend Engineer

Jul 2022 – Sep 2022 · 2 mos · Bengaluru, Karnataka, India

Worked as a Backend Engineer and helped designing APIs and handling CI/CD deployments.
Tech Stack:
Node.js
Typescript
ECS
AWS Lambda

TypeScriptAmazon Web Services (AWS)CircleCINode.jsAWS

Google summer of code

2 roles

Open Source Developer at GitLab

Jun 2021 – Aug 2021 · 2 mos

Worked with GitLab's Geo Team and worked at improving backup and restore process.
The backup and restore tools provided by GitLab are relied upon by administrators of GitLab instances as part of their disaster recovery strategy. These procedures rely on standard UNIX tools such as rsync and tar and cover most data excluding GitLab configuration.
Tech Stack:
> Ruby on Rails
> Rspec

Ruby on RailsRspec

Open Source Developer at Mozilla

Jun 2020 – Sep 2020 · 3 mos

Worked with Mozilla Firefox Accounts Team on integrating FIDO2 (Fast Identity Online) as a second-factor authentication. We are going passwordless to avoid theft and cybercrime.
We are currently adding support for authenticators such as Yubikey, BLC, and NFE.
My role included designing server-side, client-side, and backend from scratch and writing unit tests for the same.
Tech Stack:
> ES6 Javascript, TypeScript
> Nodejs
> Hapijs
> Mochajs
> Backbonejs
> Html/CSS, Mustache

Open-Source Software