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disguisedowl

Mohamed Hamed

@disguisedowl
5.0(2)

Backend Engineer: Payment Systems, Real Time Pipelines, APIs

Egypt
English, Arabic
About me
Backend engineer, 4+ years in production. I build APIs, real-time pipelines, payment systems and access control, including crypto/Web3, and own features from architecture to deployment. What I've shipped: - Cut a transaction pipeline from 8s to under 800ms - Real-time ingestion at ~1,000 events/sec, 100K at peak - Multi-provider payments and zero-fee payouts, ~30% lower ops costs - Role-verification bot for 20,000+ concurrent users - $50K+ payout tool for 20+ admins If you need someone to design the whole system, message me.... Read more

Skills

d
disguisedowl
Mohamed Hamed
Offline • 
Average response time: 1 hour

See my services

API & Integrations
I will add payments to your app or backend project
From$60 / projectMore details
E-Wallet Development
I will build a reliable backend for your crypto or web3 app
From$150 / projectMore details

Portfolio

Work experience

Lazy_Lions

Full Stack Engineer

Lazy Lions • Full-time

Jan 2022 - Jan 2026 • 4 yrs

● Redesigned the transaction-processing pipeline, cutting processing time from 8s to under 800ms and reducing peak server CPU usage ● Refactored backend infrastructure to support additional external data providers, improving modularity and speeding up feature releases ● Designed and implemented scalable APIs, maintaining ~99.9% uptime across production services ● Engineered a real-time data ingestion service sustaining ~1,000 events per second, with peak throughput up to ~100,000 events per second, to power live analytics dashboards ● Developed a Discord bot enforcing role-based access control by verifying user credentials against an external system and restricting entry to verified users ● Scaled the bot to serve 20,000+ active users under concurrent load using optimized caching and async processing

Jellycubes

Backend Engineer

Jellycubes • Freelance

Dec 2023 - Nov 2024 • 11 mos

● Integrated a multi-provider payment gateway supporting major payment methods, enabling seamless transaction processing ● Designed a zero-fee payout system, eliminating transaction overhead for end users and reducing operational costs by ~30% ● Created a distribution tool used by 20+ admins to manage $50K+ in automated payouts with built-in eligibility verification ● Developed a companion access-control platform as a monetization layer, generating additional revenue without extra infrastructure cost

2 Reviews
5.0

(2)
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Rating Breakdown
  • Seller communication level
    5
  • Recommend to a friend
    5
  • Service as described
    5
1-2 out of 2 Reviews
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    evejulian

    US

    United States

    5

    Very understanding

    $50

    Price

    Helpful?
    Yes
    No
    N
    image-docs

    naisymaree

    AU

    Australia

    5

    Very active and so helpful works out great as they are awake when im sleeping so i dont have to stress over the server running smoothly

    $50

    Price

    Helpful?
    Yes
    No