Senior Full-Stack Engineer
for Remote Teams and Product Builds
I build and scale SaaS products, backend systems, and AI-enabled workflows with Node.js, NestJS, React, Angular, and AWS. I work well with remote teams, ship fast, and focus on clean, reliable delivery.
Open to remote roles and freelance work. Comfortable with US and EU time zones.
What I Can Help With
Available for remote roles and freelance work
- Build new SaaS features and products
- Join remote product teams as a full-stack engineer
- Fix slow or messy backend systems
- Migrate legacy code safely with zero downtime
- Build APIs and microservices architectures
- Improve performance and system reliability
- Add AI features and document workflows
Featured Case Study
CloudDrive: 500K Daily Operations at Scale
The Problem
Biztree needed a unified file storage system that could handle 500K daily operations, support multiple SaaS applications, and provide role-based access control with enterprise-grade security. Sub-100ms response times were a hard requirement.
The Solution
I architected CloudDrive as a distributed microservice using NestJS with event-driven processing. It uses AWS S3 for storage, Lambda for thumbnail generation, and BullMQ for async job processing. The system handles peak loads without degradation.
Key Architecture Decisions:
- • Async Processing: BullMQ queues for thumbnail generation and metadata processing
- • Caching Layer: Redis for frequently accessed file metadata
- • AWS Integration: S3 presigned URLs for secure direct uploads, Lambda for image optimization
- • RBAC: Fine-grained permission system with role inheritance
Impact & Results
Tech Stack
Projects
Systems built, shipped, and running at scale
Biztree Business-in-a-Box
2023-PresentProblem
Multiple SaaS applications needed unified backend with reduced latency
Solution
Architected microservices backend with BullMQ and RabbitMQ for async processing
Key Results
- 12M+ Users
- 45% Latency Reduction
- 40% Dev Effort Cut
Tech Stack
RevBits PAM
2021-2023Problem
Enterprise teams needed unified privilege access management with real-time auditing
Solution
Engineered microservices platform with session forensics and comprehensive audit logs
Key Results
- Globee Gold Award
- Real-time Auditing
- Enterprise Scale
Tech Stack
Arccos Golf
2019-2021Problem
Golfers needed real-time performance tracking with environmental adjustments
Solution
Built real-time tracking system with Microsoft, integrating wind and slope data
Key Results
- 40% Accuracy Improvement
- #3 Global Innovation
- Real-time Tracking
Tech Stack
Ancera
2019-2021Problem
Food safety required fast, automated contamination detection
Solution
Built ML-powered detection pipelines with distributed processing
Key Results
- 90% Processing Speed
- ML-Powered
- Revenue Generation
Tech Stack
Proof of Scale
Delivering results at enterprise level
Experience
8+ years of proven results
Senior Software Engineer
Biztree
Architected a unified NestJS microservices backend powering 5+ SaaS applications serving 12M+ users. Reduced API latency by 45% with BullMQ and RabbitMQ. Led a zero-downtime MongoDB migration for 50M+ records using safe batch processing and rollback strategies. Built CloudDrive supporting 500K daily file operations with RBAC, S3 presigned URLs, and AWS Lambda thumbnail generation.
- Architected unified microservices backend for 12M+ users
- Built CloudDrive: 500K daily file operations with secure access
- Led zero-downtime MongoDB migration: 50M+ records
- Reduced API latency by 45% using BullMQ and RabbitMQ
- Built HRM backend with PostgreSQL, TypeORM, CQRS
- Built AI middleware for document workflows and chat systems
Senior Software Engineer
InvoZone
Delivered an enterprise Privileged Access Management (PAM) platform for RevBits security teams. Designed a scalable microservices architecture with load balancing, multi-instance clustering, and session forensics. Won Gold in the 2022 Globee Awards against Thycotic.
- Built enterprise PAM platform: credential and session management
- Designed scalable microservices with load balancing and clustering
- Added session forensics: keystroke and video recording for auditing
- Improved deployment speed by 30% with CI/CD automation
- Hardened security: XSS, SQL injection, brute-force protection
- Won Globee Gold Award for security innovation (2022)
Software Engineer
TenX
Built full-stack applications for Ancera (food safety) and Arccos Golf (sports analytics). Engineered distributed, resource-intensive systems for scientific data processing and real-time analytics with measurable impact.
- Built automated contamination detection system. Reduced processing by 90%
- Built real-time golf performance tracking with Microsoft. Improved accuracy by 40%
- Designed distributed systems for high-throughput scientific computing
- Doubled release frequency with CI/CD automation and testing
- Optimized internal NPM packages to improve developer productivity
- Won #3 ranking in global sports innovation awards (Arccos)
Skills & Expertise
Technologies I work with
Backend
- Node.js
- NestJS
- Express.js
- REST APIs
- GraphQL
Frontend
- React
- Angular
- Redux
- NgRx
- RxJS
- Tailwind CSS
Databases
- MongoDB
- PostgreSQL
- MySQL
- Redis
Cloud & DevOps
- AWS
- Lambda
- S3
- EC2
- Docker
- Kubernetes
- CI/CD
Architecture
- Microservices
- Distributed Systems
- Event-Driven
- CQRS
- System Design
AI / LLM
- Claude
- Cursor
- AI-assisted dev
- AI middleware
- Chat systems
Testing
- Jest
- Cypress
- Unit Testing
- Integration Testing
- TDD
Tools
- Git
- Jira
- Swagger
- OpenAPI
- PM2
How I Work
Team or Solo
I work with product teams or take ownership of features. Either way, I deliver clean code and reliable results.
Clear Communication
Async-friendly. Regular updates, honest about trade-offs and timelines. No surprises.
Remote-First
Comfortable with US and EU time zones. I adjust my schedule as needed and keep things transparent.
Get It Done
Full-stack work. I don't hand things off halfway. I build, test, deploy, and support what I ship.
About
I build software that needs to work under pressure. Most of my work has been in SaaS, backend systems, and product engineering, where the goal is not just to ship features but to keep things fast, reliable, and easy for teams to work with.
I am comfortable working remotely, collaborating across time zones, and taking ownership from planning to delivery. I have worked as a core team member at product companies and delivered complete systems as a freelancer on Upwork.
I also use AI tools like Claude and Cursor to move faster while keeping architecture, testing, and production quality strong.
Freelance Credibility
Trust and proven results across platforms
Top Rated Plus on Upwork. Delivered work across SaaS, security, migrations, and custom systems. Remote collaboration. Reliable delivery.
Top Rated Plus
Upwork's highest freelancer badge
Complex Systems
Trusted for backend work and product improvements
Proven Work
SaaS, security, migrations, dashboards
Reliable Delivery
Clean communication. Engineering decisions that hold up.
Get in Touch
Open to remote roles and freelance projects
Have a role or project in mind? Let's talk.
Whether you need a full-stack engineer for your remote team or help shipping a product, I am open to hearing about it.
© 2026 Asad. All rights reserved.