Koushik Saha
Senior Full-Stack Software Engineer
Over a million people use software I've built every month, most recently leading the Next.js, Node.js, and React/TypeScript platform behind a major energy company's customer experience and contributing $2M+ in annual revenue. 6+ years as a full-stack engineer, specializing in micro-frontend architecture and performance optimization, with recent work extending into AI-powered product development using Claude APIs. Maintainer of an open-source library trusted by 12+ companies.
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Engineering Experience
7+ years of building production web applications, micro-frontends, high-concurrency microservices, and leading engineering teams.
Lead Software Engineer
- Developed and launched IJAISM, a multi-tenant academic publishing SaaS (Next.js, React, Prisma, PostgreSQL), automating 4-reviewer workflows, Stripe payments, and secure ORCID authentication.
- Architected a secure multi-tenant retail platform, implementing anomaly detection algorithms, 2FA, automated payroll operations, and granular RBAC controls for 12+ stores.
- Owned end-to-end full-stack delivery, including API design, containerized deployments, and CI/CD pipelines with automated security scanning (Trivy, CodeQL).
Senior Full-Stack Software Engineer
★ High-Impact Senior Role- Modernized a utility customer portal by building a React 18 + TypeScript PWA, achieving 95+ Lighthouse scores for 1M+ active users and generating $2M+ in ARR.
- Architected micro-frontends using Webpack Module Federation, enabling three autonomous teams to deploy independently and saving $180K/year in cloud overhead.
- Designed high-throughput Go microservices for real-time energy feed monitoring, leveraging concurrency patterns to process low-latency streaming data.
- Developed an open-source React UI library downloaded 500+ times weekly, cutting frontend development overhead by 40% across 12+ companies.
- Reduced JS bundle sizes by 28% through Webpack profiling and lazy-loading, while maintaining strict compliance with WCAG 2.1 accessibility standards.
- Configured GitHub Actions CI/CD workflows from scratch, reducing build and deployment cycles from 45 to 8 minutes for 3 development teams.
- Created a lightweight A/B testing engine using Jotai, expanding experimental velocity and sprint testing capacity by 40% at million-user scale.
- Mentored 8 international engineers across 3 time zones, increasing delivery velocity by 35% and guiding 100% of mentees to promotions.
Software Engineer
- Engineered a JSON-driven micro-frontend engine rendering React landing pages, enabling product managers to deploy 1,000+ custom pages without engineering support.
- Created a browser-based React SVG editor inside Storybook, assisting sales teams in securing $500K+ in enterprise contracts.
- Designed REST/GraphQL APIs processing 50K+ daily requests at 99.8% uptime, reducing database load by 35% using Redis caching layers.
- Built a modular Tailwind CSS and Radix UI design system, reducing cross-browser visual defects by 60% and speeding up QA cycles.
- Implemented a multi-app Webpack Module Federation structure for 8 engineering squads, reducing deployment conflicts and saving $90K/year.
Junior Software Engineer
- Redesigned the mobile checkout flow with React and Optimistic UI for two major e-commerce platforms, increasing conversion rates by 35% and reducing cart abandonment by 22%.
- Optimized search APIs and scaled a Laravel REST backend by 3x, reducing response times by 20% while maintaining zero downtime during Black Friday traffic spikes.
- Built and deployed a unified PWA codebase, boosting Lighthouse performance scores from 65 to 90+ across three deployment channels.
Junior Software Engineer
- Developed and distributed a reusable JavaScript component framework, accelerating internal project timelines by 30%.
- Integrated user interfaces with Laravel REST APIs, managing client-side state transitions and data validation cycles.
- Built 3 internal web utility applications, shortening onboarding cycles for new engineering hires.
Koushik is the kind of engineer who doesn’t just build features—he builds systems that drive measurable business impact. At Powerley, he played a key role in architecting a micro-frontend system supporting 1M+ active users, balancing clean architecture with real-world performance.
Featured Projects & Open Source
Selected engineering projects demonstrating full-stack architecture, AI integration, design systems, and multi-tenant SaaS platforms.
MindReframe
AI-Native PWA
Role: Lead Architect (Solo developer). Problem: General LLM interactions suffer from high latency, prompt injections, and lack structured responses.
System Architecture
@codemen/groundfloor-react-ui
Open-Source React + TypeScript Design System
Role: Author & Maintainer. Problem: UI development suffered from cross-browser styling discrepancies and accessibility regressions, slowing feature velocity.
CI/CD & Delivery Flow
IJAISM
SaaS Academic Journal Publishing Platform
Role: Lead Software Engineer. Problem: Multi-journal academic publishing was manually operated, causing significant processing backlogs and high admin overhead.
Deployment Pipeline
Real-Time ASL Sign Language Translator
Computer Vision & WebRTC Communication Platform
Role: Lead AI & Systems Engineer. Problem: Non-verbal communication gaps cause accessibility barriers in standard video conferencing platforms.
System Architecture
FixUp LLC Report
Multi-Tenant Retail Management Platform
Role: Principal Architect. Problem: Managing daily sales, inventory, and payroll reconciliations across multiple retail tenants was prone to auditing errors and security risks.
Security & Reconciliation Flow
Skills & Technical Expertise
Comprehensive breakdown of languages, state management, testing, cloud infrastructure, and databases.
Languages
Frontend Architecture
State Management
Build & Tooling
Testing & QA
UI Systems & Design
Backend & APIs
Databases & Storage
Cloud & DevOps
Leadership & Open Source
Open-source maintainership, engineering standards, and cross-functional team mentorship.
The single maintainer of an open source React + TypeScript UI library with more than 500 weekly downloads through npm by 12+ companies; responsible for managing GitHub issues, handling community PRs, semantic versioning, and changelog.
Created React components and storybook-based engineering standards at Powerley for all 3+ products; reduced engineer onboarding time from 3 weeks to less than 1 week without any accessibility regression post implementation.
Mentored 8 engineers in US, South Asia, and Europe; 100% got promoted to mid-level within 18 months, 35% increase in team velocity, 95% retention rate.
Research & Publications
Peer-reviewed journal publications and systematic reviews exploring AI applications in healthcare, resource allocation, and cancer genomics.
Artificial Intelligence Applications for Hospital Resource Allocation in Emergency Preparedness
Big Data in Cancer Genomics: Computational Foundations and Emerging Pathways for Precision Oncology
AI-Powered Predictive Analytics in Cancer Prevention Policy: A Systematic Review
Integrating Artificial Intelligence with a Global Atlas of Human Genetic Variation: Implications for Precision Medicine
Integrating Artificial Intelligence with Global Genomic Resources: A Narrative Review of Implications for Precision Medicine
Education
MS, Engineering Management
August 2026Westcliff University — Irvine, CA
GPA: 3.91 / 4.0
BSc, Computer Science & Engineering
May 2019North South University — Dhaka, Bangladesh
Cloud Certifications
AWS Certified Solutions Architect – Associate
Amazon Web Services
Professional Cloud Architect
Google Cloud
AWS Educate Introduction to Cloud 101
Amazon Web Services
Get in Touch
Have a question or looking to recruit for a Senior or Lead Full-Stack Software Engineering role? Send me a message below or email me directly at koushik.saha666@gmail.com.
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Current Availability Status
Actively interviewing for Senior or Lead Full-Stack Software Engineer roles. Seeking a collaborative engineering team where I can architect scalable frontends (Next.js/React, Micro-frontends) and high-concurrency microservices (Node.js/Go).