Subhash Halder
Senior Software Engineer at Walmart Global Tech India
Bengaluru, Karnataka, India
Summary
🤩
Rockstar🎓
Top SchoolSubhash Halder is a Senior Software Engineer with 11 years of experience building high-performance full-stack and backend systems across JavaScript, TypeScript, Rust, and Go. He has driven measurable cost and latency improvements—most notably a POC showing ~60% server cost reduction by migrating Node.js GraphQL subgraphs to Rust and $12,000/month cloud storage savings through log optimization. He’s led large-scale operational efforts including a zero-downtime migration of over 2 billion rows and the design of a rate limiter handling 20M+ requests daily. A pragmatic engineer and coach, he’s onboarded multiple teams to Apollo Federated GraphQL and created tools that halved local GraphQL debugging time. An active open-source contributor to the popular Mermaid.js project, he added a new quadrant chart with parser, lexer, and tests—showing his reach spans both infra and developer-facing UX. Based in Bengaluru, he’s seeking Staff-level roles where language diversity and systems-level performance work deliver tangible business impact.
10 years of coding experience
9 years of employment as a software developer
IK Gujral Punjab Technical University10+2 Standered, Science, 10+2 Standered, Science at Guru Teg Bahadur Public School10th Standered, 10th Standered at Pranavananda Vidyamandir
English
Stackoverflow
38reputation
489reached
6answers
1question
Github Skills (16)
typescript10
javascript10
typescripts10
jison10
typescript-types10
testing9
diagram9
front-end-development8
json6
html6
ajax6
iframe6
php6
jquery6
fusioncharts6
Programming languages (3)
Github contributions (5)
mermaid-js/mermaid
Mar 2023 - Feb 2024
Generation of diagrams like flowcharts or sequence diagrams from text in a similar manner as markdown
Role in this project:
Full-stack Developer
Full-stack DeveloperContributions:101 reviews, 3 PRs, 152 comments in 11 months
Contributions summary:Subhash's commits indicate a focus on developing and integrating quadrant chart functionality within the Mermaid.js project. They added a parser and TypeScript definitions for the new chart type. The commits show the addition of the chart builder and related components for the new quadrant chart, including the implementation of a new lexer, parser, and test cases. Finally, the user made changes to documentation and end-to-end (e2e) testing to make sure the new chart component is fully functional.
diagramsflowchartssequencesequence-diagramssimilar
subhash-halder/dotfiles
Jul 2019 - Oct 2021
Contributions:76 commits, 54 pushes, 1 branch in 2 years 4 months
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