Arjun Verma
Verified Expert in Engineering
Ruby On Rails 5/6/7/8 Developer
Gurugram, Haryana, India
Toptal member since September 4, 2025
Built systems handling millions in transactions. At PayU: 500x TPS increase in Rust (30→15,000/host). At Urban Company: cut chat latency from 300ms to <75ms, lifting adoption 32%→47%. Specialties: high-scale back ends, payments, and real-time platforms. Stack: Rust, Rails, Node.js, AWS, Kafka. Seeking: back-end architecture, payment systems, or scaling challenges.
Portfolio
Experience
- Apache Kafka - 10 years
- Ruby On Rails 5/6/7/8 - 10 years
- Amazon Web Services (AWS) - 8 years
- Microservices - 7 years
- Engineering Management - 5 years
- Rust - 4 years
- Artificial Intelligence (AI) - 3 years
- AI Agents - 1 year
Preferred Environment
Slack
The most amazing...
...thing I'm most proud of was redesigning PayU's transaction cycle in Rust, achieving a 500x performance boost from 30 to 15,000 TPS per host.
Work Experience
Head Of Engineering
Self-employed
- Scaled the company's revenue from $0 to $100,000 annually while maintaining a lean team size under 10 people. Established partnerships with Now Delivery, Borzo India, FableStreet, Q2Pay, and RushSports.
- Implemented code generators integrated with GPT-engineer and automated a 2-level code review process before human intervention. Automated incident resolution for 20% of the most critical system errors.
- Expanded value proposition from software development to full-stack productising, designing, development, and customer feedback gathering. Created and scaled both FOSS and SaaS business verticals.
Lead Software Engineer
Urban Company
- Redesigned and rewrote chat service, Ejabberd infrastructure, and chat React SDK, achieving 99.999% latency reduction from 300ms to under 75ms, directly increasing customer-partner chat adoption from 32% to 47%.
- Migrated 100% of CRM agents from phone calls to chat-based support, reducing per-issue resolution costs from Rs 55 to Rs 37 while maintaining service quality and customer satisfaction.
- Led complete communication platform overhaul, including real-time messaging architecture, WebSocket optimisation, and mobile SDK improvements, resulting in measurable business impact across customer experience metrics.
Lead Software Engineer | RnD Platform Head
PayU India
- Redesigned transaction cycle in Rust, achieving 500x TPS increase from 30 to 15,000 per host. Led Service Starter Kit development, migrating 40% of microservices in four months, reducing shipping cycles from 23 to 9 days.
- Designed an Enterprise Service Bus, reducing HTTP API dependency by 90% and onboarding 14/32 services in six months. Built a payment gateway config engine, transferring integration tasks from developers to PMs, cutting the developer queue by 40%.
- Implemented Chargeback service from scratch, scaling to 2,500 RPS with 450ms latency using three hosts. Developed a static risk engine, reducing fraudulent merchant onboarding by 13% and optimising data migration to 2 million records per minute.
Experience
Fashion Supply Chain Management System
https://stream.arjunverma.in/CHALLENGE 1
• Complex Multi-team Workflow Orchestration
• Problem: Coordinating 15+ different workflow types across internal teams and external fabricators with varying capabilities
• Solution: Built a flexible workflow engine supporting dynamic task assignment, priority management, and real-time status tracking across seven fabricator workflow types.
CHALLENGE 2
• Real-time Production Visibility
• Problem: Management needed live visibility into production bottlenecks and team performance.
• Solution: Implemented eight specialized dashboards with real-time updates using Turbo Streams, providing instant insights into production stages and team efficiency.
CHALLENGE 3
• Inventory and Order Fulfillment Complexity
• Problem: Managing virtual inventory across multiple product sizes while handling single and bulk orders (1,000+ items)
• Solution: Developed a sophisticated virtual inventory system with automatic fulfilment logic, supporting different garment sizes and real-time quantity tracking.
Education
Bachelor's Degree in Computer Engineering
Vellore Institute of Technology - Vellore, India
Certifications
Hugging Face AI Agents Course
Hugging Face
Skills
Libraries/APIs
Sidekiq, Node.js, React
Tools
Git, Slack, Redash
Languages
Ruby, Python, Rust, Snowflake
Paradigms
Agile Software Development, Microservices, Event-driven Design (EDD), ETL
Platforms
Apache Kafka, Amazon Web Services (AWS)
Storage
Redis, JSON, PostgreSQL, Elasticsearch
Other
Engineering Management, Tailwind UI, Data Analysis, Ruby On Rails 5/6/7/8, Large-scale Distributed Systems, Ejabberd, XMPP, Chatbots, AI Translation, WebSockets, OpenAI GPT-4 API, Artificial Intelligence (AI), Vite, AI Agents, AI Voice Agents, Data Engineering, Analytics, B.Tech. Computer Science Engineering
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