# Hassan Abrar

Senior Backend Engineer · distributed systems and multi-tenant architecture

Lahore, Pakistan · remote · hassanabrar202@gmail.com · https://www.linkedin.com/in/hassanabrar202/

I'm a senior backend engineer with 5+ years building and operating production systems across enterprise fintech, adtech and high-volume SaaS. I work across both major backend ecosystems, Java/Spring Boot and Node.js/TypeScript, with depth in event-driven microservices, multi-tenant architecture and real-time data pipelines.

I led the decomposition of a monolith into 12 production microservices, architected multi-tenant infrastructure for 1,000+ isolated tenant databases at 99.9% uptime, and have mentored 5+ engineers. I work remotely with teams across Saudi Arabia, Europe and North America.

## Products

- **ClickFortify** (https://www.clickfortify.com): Scores every paid click and excludes bots, click farms and repeat offenders in Google Ads and Meta.
- **VoxRange** (https://www.voxrange.com): AI voice infrastructure: one platform for every voice interaction.
- **Pedibee** (https://pedibee.com): CRM and email marketing for growing teams: campaigns, sequences and automations sent from your own Gmail, plus an MCP server.
- **GeoIPHub** (https://geoiphub.com): IP geolocation, VPN/proxy/Tor detection and an explainable 0–100 risk score in one REST API.
- **Inposty** (in development): Social content planning and publishing.
- **Keplaris** (https://keplaris.com): Product engineering studio behind ClickFortify, Pedibee, Inposty and GeoIPHub.

## Selected architectures

- **ClickFortify**: Real-time ad-fraud detection for Google Ads and Meta Ads. Lead architect. Stack: NestJS, TypeScript, PostgreSQL, Redis, BullMQ, Kubernetes, Next.js.
- **Masdr payroll platform**: Enterprise fintech and payroll for large Saudi employers. Senior Backend Engineer (contract) via Mission.dev. Stack: Java, Spring Boot, JMS, Apigee, Splunk, Jenkins, IBM UrbanCode Deploy, WebLogic.
- **Southville multi-tenant platform**: From one monolith to 12 production microservices. Senior Software Engineer. Stack: NestJS, Node.js, Spring Boot, MongoDB, PostgreSQL, Redis, JMS, Docker, Kubernetes.
- **VoxRange**: Voice AI and call analytics infrastructure. Builder. Stack: Telephony, Speech-to-text, Text-to-speech, Self-hosted GPU.
- **Lytics · PEMRA**: Media monitoring and intelligence for the Pakistan Electronic Media Regulatory Authority. Software Engineer. Stack: Node.js, React, MongoDB, PostgreSQL.

## Experience

### Senior Backend Engineer · Mission.dev (client: Masdr)
2025-05 – present · Remote · Riyadh, Saudi Arabia

- Own end-to-end feature delivery across Spring Boot microservices in a multi-tenant, multi-database payroll architecture.
- Design asynchronous JMS pipelines for payroll processing, bank verification and inter-service communication.
- Manage the API lifecycle on Apigee: rate limiting, auth policy and request/response validation.
- Build Splunk dashboards and alerting that shorten diagnosis of payroll and verification incidents.

### Senior Software Engineer · Southville Solutions
2023-02 – present · Lahore, Pakistan

- Led the decomposition of a monolith into 12 production microservices.
- Architected multi-tenant infrastructure for 1,000+ isolated tenant databases at 99.9% uptime.
- Built a NestJS/MongoDB booking platform handling 10,000+ daily transactions; improved API response times by 40%+.
- Centralized observability across GCP Logging, CloudWatch and Splunk, cutting incident resolution time by 60%; mentored 5+ engineers.

### Associate Software Engineer · Stack Intel .IO
2021-05 – 2023-01 · Lahore, Pakistan

- Built real-time chat on Node.js, WebSockets and Redis Pub/Sub for 10,000+ concurrent users at 99.8% delivery.
- Shipped sub-100ms push notifications with Socket.io and Redis Streams; integrated Stripe with zero security incidents.
- Raised test coverage to 85% with Jest, Mocha and Supertest, reducing defects by 45%.

### Developer Head · MSP Community, University of Lahore
2021-10 – 2022-04 · Lahore, Pakistan

- Led the developer track: technical sessions and hands-on support for student engineers.

### BS Computer Science · The University of Lahore
2017-09 – 2021-06 · Lahore, Pakistan

- Bachelor of Science in Computer Science.

Languages: English, Urdu