Mohammad W.
Senior Software Engineer
Experience
Dec 2024 - Present
1 year 1 monthUnited States
Senior Software Engineer
Xquic
- Led the full development lifecycle of the Xquic hotel revenue recovery system, architecting an OTA reconciliation engine using Python and FastAPI to replace a monolithic architecture and managing a junior engineer
- Drove system performance and stability by conducting a major Ruby and Rails version upgrade and heavy optimization, resulting in a 3x increase in system speed
- Improved application performance by up to 40% through advanced query optimization, implementing complex business logic queries in PostgreSQL and utilizing caching with Redis, leading to faster page load times
- Streamlined DevOps and infrastructure by leading the migration from Heroku to AWS using Terraform, cutting infrastructure costs by 30%, improving disaster recovery posture, and reducing deployment times from hours to minutes
- Integrated key third-party services (ClickUp, Zapier, Slack, Stripe, Zoho) for end-to-end automation and built customer onboarding automation using APIs, helping hotels save thousands through automated reconciliation
Mar 2024 - Dec 2024
10 monthsLahore, Pakistan
Senior Software Engineer
Devsinc
- Engineered a 60% reduction in page load time and 300% more traffic capacity for Concert Finance by implementing table partitioning and migrating slow ActiveRecord queries to raw SQL
- Designed a highly scalable multi-tenant architecture with separate databases per client and built a commissions engine to handle multi-step filtering and transformation, reducing Sidekiq job failure rates from 25% to under 2% using ActiveJobs with dead-letter queue support
- Spearheaded the complete overhaul and migration of the nationwide U.S. benefits platform YourParsley from a legacy PHP/Perl codebase to a modern Ruby on Rails and TypeScript stack, enabling an early go-to-market launch and securing new funding
- Architected and executed performance improvements for YourParsley, including SQL query optimization and resolving query bottlenecks, resulting in a 40% increase in transaction speeds and a 20% reduction in page load times
- Developed and scaled core platform capacity by building a dynamic question engine for marginal tax rate calculations and adding 35 to 40 new benefit programs (a 300% increase)
- Elevated code quality and security by implementing behavior-driven development with RSpec and Cypress for robust feature testing, developing secure RESTful APIs, and performing security upgrades to mitigate vulnerabilities
Aug 2021 - Mar 2024
2 years 8 monthsLahore, Pakistan
Software Engineer
Devsinc
- Engineered high-performance data extraction for LegitScript, including a complete rebuild using scalable microservices and developing a Shopee scraper with Playwright that achieved a 4x speed improvement and secured a major pilot contract
- Implemented large-scale data pipelines processing billions of records monthly using VPN proxies for distributed, evasion-resistant scraping, automated infrastructure provisioning with Puppet, and AWS Lambda for cost-efficient scraping
- Managed development of the Omise Chargeback project, ensuring full PCI compliance across all financial workflows, building containerized environments with Docker, and designing modules for fraud detection, charge, refund, and transaction management
- Achieved an estimated 80–90% reduction in manual workload for bank merchants by migrating key dispute workflows from manual processes to full automation
- Integrated core payment networks including JCB, Visa, and Mastercard, and payment methods like neaPay
- Enhanced high-traffic education features for Imagine Learning by improving the adaptive learning engine and personalizing lesson sequencing
- Integrated with the Schoology LMS to support data exchange and reporting, built teacher dashboards, and upgraded multimedia systems using Vue.js, TailwindCSS, and Rails
- Championed quality by implementing crucial accessibility features (ADA/WCAG) and establishing RSpec unit testing, contributing to improved learning outcomes
Feb 2020 - Aug 2021
1 year 7 monthsLahore, Pakistan
Associate Software Engineer
InvoZone
- Designed Kafka-based microservices for Avalara CertCapture and implemented webhooks and Avro schema contracts to guarantee data integrity across financial reconciliation systems
- Integrated dynamic pricing engines to adjust event costs in real time and enhanced registration via Salesforce integrations
- Added Sage Intacct purchase order and vendor management features through API synchronization and designed bulk CSV pipelines for large data imports
Summary
Full-stack Ruby on Rails developer with 6+ years of experience turning complex business challenges into fast, reliable, and scalable software. Experienced across fintech, ed-tech, compliance, and enterprise SaaS, often tackling legacy code, performance issues, and broken data pipelines. Skilled end-to-end: designing Rails backends, building React/TypeScript frontends, optimizing databases, and delivering smooth user experiences. I've worked on multi-tenant platforms, financial engines, large-scale scrapers, microservices, and API-heavy products, improving speed, stability, and code quality. I collaborate closely with product, QA, DevOps, and design teams, focusing on maintainable code and delivering measurable business value.
Languages
Urdu
NativeEnglish
AdvancedEducation
Oct 2017 - Mar 2021
PUCIT
Bachelor of Science, Software Engineering · Software Engineering · Lahore, Pakistan
Certifications & licenses
AWS Certified Solutions Architect
AWS
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