Haider Zaman

HZ

Looking for a job

Haider Zaman

@haiderzaman

I build high-throughput ad-tech, e-commerce, and SaaS systems end to end.

What I'm looking for

I'm looking to build backend, full-stack, and ad-tech products end to end, especially high-throughput, latency-sensitive systems across SaaS, AI, e-commerce, and advertising.

At Advergic, I’m the sole engineer building a complete programmatic advertising stack—from a Go-based DSP bidder and identity service to an Android SDK, self-hosted Prebid Server, analytics pipelines, and management dashboards. I’ve designed real-time systems for bidding, fraud detection, cross-device identity resolution, and e-commerce attribution.

I’ve also built data-driven sports analysis features at RevSport, a FastAPI commerce-integration backend at Mobileriz, and SaaS and marketplace products at CodeFreaks. As a Top Rated Upwork freelancer, I deliver backend, full-stack, AI, and ad-tech products for international SaaS, e-commerce, and healthcare clients.

Experience

Work history, roles, and key accomplishments

AD

Current

Full-Stack Developer (Sole Engineer)

Current

Advergic

Apr 2025 - Present (1 year 6 months)

Own and build the company's entire programmatic ad-tech platform, from real-time bidding to analytics.

Go Gin OpenRTB 2.X Kotlin Prebid Google Ad Manager LiveRamp ID5 UID2 TCF 2.0 Aerospike Redis Kafka Clickhouse ES6 GDPR CCPA

UP

Current

Top Rated Freelancer

Current

Oct 2024 - Present (2 years)

Maintained a 5-star rating delivering backend, full-stack, and ad-tech projects for international clients across SaaS, AI, and e-commerce domains.

Backend Development Fullstack Development AdTech SaaS AI Ecommerce

RE

Full-Stack Developer

RevSport

Jan 2025 - Dec 2025 (11 months)

Built features in the Next.js web app and developed a Python service for AI features using vector embeddings and similarity search.

Next.js Python Embeddings Similarity Search

MO

Senior Backend Engineer

Mobileriz

Jan 2024 - Dec 2025 (1 year 11 months)

Designed a flow-first architecture and built the complete backend in FastAPI with PostgreSQL, deployed on AWS.

fastAPI PostgreSQL REDIS Streams Celery AWS Flutter

CO

Full-Stack Developer

CodeFreaks

Jan 2024 - Apr 2025 (1 year 3 months)

Built Dexta, Winchit, and EVC Share platforms using NestJS, Node.js, and AWS infrastructure.

NestJS MySQL TypeORM Stripe NodeJS Express WebSockets AWS

VU

Backend Developer (Contract)

Vendo / TaskDONE UG

May 2024 - Oct 2024 (5 months)

Developed the MERN-stack backend for a live German NFC-based loyalty app with 10K+ Google Play downloads and a 4.3 rating.

MERN Stack MongoDB Express React NodeJS

Education

Degrees, certifications, and relevant coursework

Haider hasn't added their education

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Tech stack

Software and tools used professionally

Availability

Looking for a job

Location

Pakistan

Authorized to work in

Salary expectations

60k+ USD

Social media

Job categories

Backend Engineer Full Stack Developer Software Engineer

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