Mahmudul Alam

@devmahmud
5.0(111)

Level 2

Senior engineer building payment systems, APIs and web applications

Bangladesh
English, Bengali
About me
Senior engineer, 7+ years. I build payment systems, card and crypto, with KYC compliance built in. Recent: Stripe and crypto on/off-ramp flows for a crowdfunding platform serving Brazil's creator community. Payment rails and KYC for a Japanese e-commerce ecosystem. Backend lead on a micropayments app. A crashing production endpoint rewritten 3.4x faster. Python (Django, DRF, FastAPI), Node.js/TypeScript (Express, NestJS), React, Next.js, PostgreSQL, AWS. Tell me what you need built or fixed. I'll tell you exactly what it takes.... Read more

Skills

d
devmahmud
Mahmudul Alam
$30/hour
Offline • 
Average response time: 2 hours

See my services

Full Stack Web Applications
I will be your full stack developer with react python fastapi and nodejs
5.0(110)

Want to work on an hourly basis?

Tell Mahmudul Alam what you need.

$30

/

hour

Portfolio

Work experience

Individual Contributor (IC)

Creative Crowdfunding Protocol • Full-time

Sep 2022 - Present3 yrs 11 mos

- Led full-stack development of a large-scale crowdfunding platform using React, Next.js, Express.js, and TypeScript, delivering robust, production-ready features end to end. - Architected and led the frontend application for Catarse, one of Brazil’s largest crowdfunding platforms, ensuring scalability, maintainability, and high performance. - Led the frontend team for Rakunew and PledgeX, powering a Japanese eCommerce ecosystem enabling sellers/creators to distribute products across multiple platforms. - Architected and delivered maintainable Next.js codebases for multiple clients, with a focus on clean architecture, reusability, and long-term extensibility. - Implemented US payment methods, crypto on-ramp/off-ramp flows using Stripe and Bridge, and integrated Persona + Bridge KYC for regulatory compliance. - Built and integrated Web3 wallet connections, smart contract interfaces, and secure blockchain transaction workflows across multiple networks. - Designed reusable frontend and backend modules that improved contributor developer experience (DX) and reduced new feature development time by ~30%. - Optimized backend API performance and caching layers, significantly reducing server load and improving response times. - Collaborated closely with design, backend, and product teams to deliver high-quality, end-to-end features across multiple product lines. - Developed custom Shopify apps and integrated Shopify Liquid templates to implement a seamless pre-order with crypto flow for Karma Automotives.

111 Reviews
5.0

(109)
(2)
(0)
(0)
(0)
Rating Breakdown
  • Seller communication level
    5
  • Quality of delivery
    5
  • Value of delivery
    5
1-5 out of 111 Reviews
Sort By
Most relevant
    C

    ctpolar

    US

    United States

    Ongoing collaboration
    5

    Awesome job and easy to work with!

    $400-$600

    Price

    8 days

    Duration

    gig

    Full Stack Web Applications

    Helpful?
    Yes
    No
    C
    image-docs

    cool4trade

    US

    United States

    Ongoing collaboration
    5

    Great working with the seller. He is a true professional and an excellent developer. Happy to recommend to anyone.

    $100-$200

    Price

    8 days

    Duration

    gig

    Full Stack Web Applications

    Helpful?
    Yes
    No
    K

    kelly_frias

    US

    United States

    Ongoing collaboration
    5

    He handled the custom inventory app with strong professionalism. He quickly understood the requirements and delivered ahead of schedule. Communication remained smooth and straightforward throughout the process. I’m very satisfied with the overall quality of his work.

    $50

    Price

    4 days

    Duration

    gig

    Full Stack Web Applications

    Helpful?
    Yes
    No
    W

    wynter_rave

    US

    United States

    Ongoing collaboration
    5

    Mahmudul delivered excellent custom work with added features like barcode scanning and weekly email reports. He handled everything smoothly without any hassle. The final app matched the agreed scope perfectly. Professional, responsive, and very reliable throughout.

    $50

    Price

    3 days

    Duration

    gig

    Full Stack Web Applications

    Worksample image
    Helpful?
    Yes
    No
    C
    image-docs

    cool4trade

    US

    United States

    Ongoing collaboration
    5

    Nice working with the seller on a big project. He is now part of the team

    $200-$400

    Price

    2 weeks

    Duration

    gig

    Full Stack Web Applications

    Helpful?
    Yes
    No