Publication
Simplified NGINX Load Balancing with Loadcat
https://www.toptal.com/developers/devops/simplified-nginx-load-balancing-with-loadcat
Mahmud is available for hire
Hire MahmudMahmud Ridwan
Verified Expert in Engineering
Go Developer
Dhaka, Dhaka Division, Bangladesh
Toptal member since January 16, 2014
Bio
Mahmud is a back-end software engineer with 15 years of experience using Go and JavaScript. He builds efficient systems, including SRE tooling, production services, development tools, and integrations. His recent work includes SRE for robo-taxis, DePIN orchestration, and delivery platform integrations. Experienced with Kubernetes, Docker, Terraform, GCP, and AWS, Mahmud maintains Redsync (a Redlock Go implementation) and built Toph, a competitive programming platform with a secure sandbox.
Portfolio
LiveDocs Inc
JavaScript, TypeScript, CodeMirror, Language Server Protocol (LSP), Rust
Hivello Operations B.V.
Go, Docker, Web3, Blockchain, Google Cloud Platform (GCP), Podman...
Cruise
Go, Incident Management, Terraform, Kubernetes, Helm...
Experience
- Back-end Development - 13 years
- Go - 12 years
- Docker - 10 years
- Distributed Systems - 7 years
- MongoDB - 6 years
- Redis - 6 years
- PostgreSQL - 4 years
- TypeScript - 4 years
Work Experience
Language Server Integration Developer
2025 - 2025
LiveDocs Inc
- Developed a language server client with custom requirements in TypeScript for CodeMirror 6.
- Integrated the language server client into an existing Rust-based web application.
- Investigated and solved a language server bug in the open-source Python LSP Server project.
Technologies: JavaScript, TypeScript, CodeMirror, Language Server Protocol (LSP), Rust
Software Engineer
2024 - 2025
Hivello Operations B.V.
- Implemented cross-platform orchestration support for several DePINs in Go.
- Engineered a generalized solution for DePIN pre-funding.
- Designed a solution for tracking client device uptime and rewards.
- Supported team in transitioning from a desktop-only to a cloud-backed desktop solution.
- Led a team of developers focused on adding support for DePINs.
- Profiled and optimized performance issues in Go programs.
Technologies: Go, Docker, Web3, Blockchain, Google Cloud Platform (GCP), Podman, Windows Subsystem for Linux (WSL), Windows, Linux, Architecture, SQL, React, Concurrent Programming, Vercel
Back-end Engineer
2023 - 2023
Cruise
- Built integrations between incident management and site reliability tools.
- Designed and implemented an event audit framework using Go.
- Implemented data synchronization pipelines using Go on Google Cloud Dataflow.
- Designed dashboards using Looker and Looker Studio.
- Worked on infrastructure using Terraform and Helm.
- Configured CI/CD to automate and optimize deployment.
Technologies: Go, Incident Management, Terraform, Kubernetes, Helm, Google Cloud Platform (GCP), Cloud Dataflow, Google BigQuery, Looker, Looker Studio, Buildkite, REST, FireHydrant, Back-end Development, Test-driven Development (TDD)
Integration Developer
2021 - 2022
Deliveroo
- Designed and implemented state machine-based data pipelines.
- Implemented and maintained custom integrations with Go.
- Reviewed and refined integration developer documentation.
- Facilitated team stand-ups and refinement sessions.
Technologies: Go, Integration, PostgreSQL, Terraform, Redis, Amazon S3 (AWS S3), AWS Step Functions, AWS Lambda, Amazon Web Services (AWS), APIs, Back-end, DevOps, Back-end Development, SQL, Concurrent Programming
Lead Editor for Engineering Blog
2015 - 2021
Toptal
- Helped others author rich technical content for the Toptal Engineering Blog and Toptal Resources.
- Developed Battlescripts - a bot-vs-bot Battleships web game.
- Developed Hopper - a prototype deployment automation tool.
- Developed Arteegee - a simple implementation of the popular game Connect Four over WebRTC.
Technologies: WebRTC, Go, Node.js, Software, Linux, Redis, Writing & Editing
Software Engineer
2012 - 2015
Mukto Software
- Developed a Django application for the medical wing of a large organization's resource management solution.
- Built a programming contest platform in Node.js. Implemented a ptrace-based Sandbox service.
- Built a PHP/Yii-based web user interface for a Java application.
- Built several Go microservices for an external project.
Technologies: Python, Go, PostgreSQL, Node.js, REST APIs, Architecture, DevOps, Back-end Development, SQL, Test-driven Development (TDD), Django, MapReduce, Model View Controller (MVC), Full-stack, Full-stack Development, ETL
Full-stack Developer
2014 - 2014
Mainsocial
- Created several services in a micro-architecture fashion.
- Built an authentication service with single-sign-on capabilities.
- Constructed a central service for storing sports statistics, with revision history and reversion support.
- Developed a fantasy sports web game involving baseball.
- Created a real-time fantasy sports game involving ice hockey.
Technologies: Firebase, AngularJS, Underscore.js, CoffeeScript, Express.js, MongoDB, Node.js, Serverless, Back-end Development, Front-end Development, Full-stack, Full-stack Development
Researcher
2012 - 2014
Computer Vision and Cybernetics Group
- Prototyped machine learning algorithms using MATLAB.
- Implemented and benchmarked a number of offline signature verification algorithms.
- Implemented efficient object detection, recognition, and path-finding algorithms.
- Implemented a tool for doing binary sentiment analysis on tweets.
- Implemented a semi-supervised algorithm for document classification.
Technologies: Python, MATLAB
Web Developer
2010 - 2013
Freelance Clients
- Built an obfuscated URL Google App Engine and Python web app.
- Created a poetry kit-like Google App Engine and Python web app for product title generation.
- Developed a product details webpage scraper in C# featuring automated translation from non-English websites.
- Implemented PayPal and eBay integration for product sales monitoring in a Google App Engine and Python application.
- Built auction management and planning software in Google App Engine and Python.
Technologies: Google App Engine, JavaScript, Python, C#, jQuery, CSS, PSD to HTML, APIs, HTML, HTML5, Back-end Development, Laravel, NoSQL, Test-driven Development (TDD), WordPress, Front-end Development, Mercurial, Model View Controller (MVC), Full-stack, Full-stack Development
Project History
Toph — A Competitive Programming Platform
https://toph.coToph is a scalable, resilient, competitive programming platform built in Go (MongoDB, Redis, RabbitMQ, S3-style storage). The user code runs in a custom Go sandbox using Linux namespaces and cgroups for isolation and resource limits. The platform has long hosted contests and is widely adopted by universities and competitive programmers.
Redsync — A Redis-based Distributed Lock
https://github.com/go-redsync/redsyncRedsync provides a Redis-based distributed mutual exclusion lock implementation for Go, as documented in the official Redis distributed locks guide. Redsync has around 4,000 GitHub stars and is the reference Go implementation of the Redlock algorithm.
Codemirror LanguageServer — Plugin for Language Server Protocol Features
https://github.com/FurqanSoftware/codemirror-languageserverCodemirror LanguageServer is a CodeMirror 6 plugin implemented in TypeScript that adds Language Server Protocol features, including diagnostics, autocompletion, hover, and go-to-definition, bringing IDE-like editing to any CodeMirror-based interface. It receives over 5,000 npm downloads per week and powers the code editor in Toph, Bangladesh's leading competitive programming platform.
Arturia — Sandbox for Linux Processes
Arturia is a sandbox software and process orchestrator for Linux. It uses Linux namespaces, cgroups, and seccomp BPF to isolate resources from untrusted processes.
I wrote about Linux namespaces on the Toptal Engineering Blog: https://www.toptal.com/linux/separation-anxiety-isolating-your-system-with-linux-namespaces.
I wrote about Linux namespaces on the Toptal Engineering Blog: https://www.toptal.com/linux/separation-anxiety-isolating-your-system-with-linux-namespaces.
Papyrus
https://github.com/gophergala2016/papyrusPapyrus is a real-time collaborative Markdown editor and document repository with project-based organization. Built in Go with CodeMirror and MongoDB, it implements operational transformation for conflict-free concurrent editing, allowing multiple users to edit the same document simultaneously. Built during GopherGala 2016, it was selected as a Top 20 global finalist.
Brdgd — P2P File Transfer using WebRTC
https://github.com/hjr265/brdgdBrdgd, pronounced "bridged," is a straightforward P2P file transfer web app. It depends on PeerJS to manage the P2P connections. The web app, in rare cases, uses a turn server to relay the connection in cases where the peers cannot reach each other due to certain obvious reasons.
Dots — DNS Lookup Tools
https://github.com/hjr265/dotsDots is a networking utility web application built with Node.js. It supports DNS (A, AAAA, CNAME, MX, among others), rDNS, WHOIS, and geolocation lookups on domains and IP addresses. It uses my WHOIS package for Node.js.
Scanlib
https://github.com/FurqanSoftware/scanlibScanlib is a meta parser than can be used to validate text files. Scanlib is also able to emit C++, Go, and Python code that can read contents of similarly structured text files into variables.
This is useful in validating input files while designing programming challenges for competitive programming contests.
This is useful in validating input files while designing programming challenges for competitive programming contests.
Publication
Taming WebRTC with PeerJS: Making a Simple P2P Web Game
https://www.toptal.com/developers/webrtc/taming-webrtc-with-peerjs
Publication
Introducing Battlescripts: Bots, Ships, Mayhem!
https://www.toptal.com/developers/nodejs/introducing-battlescripts-bots-ships-mayhem
Publication
Deploy Web Applications Automatically Using GitHub Webhooks
https://www.toptal.com/developers/devops/deploy-web-applications-automatically-using-github-webhooks
Publication
Top 8 Most Common Mistakes That Backbone.js Developers Make
https://www.toptal.com/developers/backbone-js/top-8-common-backbone-js-developer-mistakes
Publication
The Top 10 Most Common Mistakes That Node.js Developers Make
https://www.toptal.com/developers/nodejs/top-10-common-nodejs-developer-mistakes
Publication
Predicting Likes: Inside A Simple Recommendation Engine’s Algorithms
https://www.toptal.com/developers/algorithms/predicting-likes-inside-a-simple-recommendation-engine
Publication
Separation Anxiety: A Tutorial for Isolating Your System with Linux Namespaces
https://www.toptal.com/developers/linux/separation-anxiety-isolating-your-system-with-linux-namespaces
Education
2008 - 2012
Bachelor's Degree in Computer Science
North South University - Dhaka, Bangladesh
Skills
Libraries/APIs
Node.js, React, Underscore.js, WebRTC, jQuery, REST APIs
Tools
Git, RabbitMQ, Grafana, CodeMirror, MATLAB, Mercurial, NGINX, Cgroups, Terraform, AWS Step Functions, Helm, Cloud Dataflow, Looker
Languages
JavaScript, CoffeeScript, Go, Python, PHP, Bash, SQL, C, C++, TypeScript, Rust, Java, Assembly, C#, CSS, HTML, HTML5
Frameworks
Express.js, Laravel, Django, AngularJS, Bootstrap
Paradigms
REST, Test-driven Development (TDD), Concurrent Programming, MapReduce, Model View Controller (MVC), DevOps, ETL
Platforms
Firebase, Google App Engine, WordPress, Linux, Heroku, Docker, AWS Lambda, Amazon Web Services (AWS), Iron.io, Kubernetes, Google Cloud Platform (GCP), Buildkite, FireHydrant, Blockchain, Windows, Vercel
Storage
MongoDB, Redis, PostgreSQL, MySQL, Memcached, NoSQL, Amazon S3 (AWS S3)
Other
Front-end Development, Distributed Systems, Writing & Editing, APIs, Back-end Development, Full-stack, Full-stack Development, Machine Learning, Prometheus, Language Server Protocol (LSP), Algorithms, ACM Problem Solving, Data Structures, Architecture, Competitive Programming, Software, PeerJS, DNS, Integration, Compilers, Code Generators, Parsers, Networking, PSD to HTML, RPC, Message Queues, Back-end, Front-end, Serverless, Incident Management, Google BigQuery, Looker Studio, Web3, Podman, Windows Subsystem for Linux (WSL), Digital Transformation
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