I will build secure cryptocurrency backend apis with multi blockchain support

Krishnansh
5.0
5.0

India

I speak English, Hindi

3 orders completed

I Build Scalable SaaS and MVP Apps That Actually Work Flutter, Node, AWS

I help startups and businesses build scalable SaaS, web, and mobile apps that don’t break in production. With 6+ years of experience and as the founder of Niladri Tech Solutions, I’ve delivered 50+ ap...
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About this Gig

Expert Server-Side Cryptocurrency Backend Development

Specialized in production-ready cryptocurrency infrastructure with proven multi-blockchain expertise and secure transaction processing.

What You Get:

  • Multi-Currency Support: Bitcoin, Litecoin, Dogecoin, Ethereum, 15+ altcoins
  • PSBT-Based Signing: Modern transaction signing with client-side security
  • Real-Time Processing: Live balance updates via Electrum integration
  • Enterprise Security: JWT authentication, rate limiting, input validation

Professional Services:

  • RESTful APIs with comprehensive documentation
  • Advanced UTXO management and fee optimization
  • Custom payment processing with webhook integration
  • Optimized database schemas for crypto operations

Security-First:

  • Zero private key storage ensures maximum security
  • 100% test coverage with 28/28 tests passed
  • Industry-standard security practices
  • Clean, documented, vulnerability-tested code

Tech Stack: Node.js, Express.js, MongoDB, bitcoinjs-lib, bip32/bip39, WebSocket support

Perfect For: Fintech startups, exchanges, DeFi projects, e-commerce sites, investment platforms

Includes: Complete source code, API testing, security implementation, deployment guide, technical support


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build secure cryptocurrency backend apis with multi blockchain support
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build secure cryptocurrency backend apis with multi blockchain support

Supported Features:

API integration

•

Block confirmation tracking

+7 more

Currency Compatibility:

Bitcoin (BTC)

•

Ethereum (ETH)

+13 more

Programming Language:

Node.js

My Portfolio

Reviews

2 reviews for this Gig
5.0

(2)
(0)
(0)
(0)
(0)
Rating Breakdown
  • Seller communication level
    5
  • Quality of delivery
    5
  • Value of delivery
    5
Sort By
Most relevant
  • B

    broke6699

    TR

    Turkey

    5

    Great experience working with Niladri. Strong technical skills, clear communication, and delivered a fully working encrypted E2E flow as expected. Very reliable — looking forward to continuing the collaboration.

    $800-$1,000

    Price

    11 days

    Duration

    Helpful?
    Yes
    No
  • B

    broke6699

    TR

    Turkey

    5

    Niladri delivered a solid end-to-end relayer MVP for our protocol. The architecture was well thought out, especially around the Waku-based intent flow, queue/worker execution, and overall system design. Communication was clear throughout, and he was very responsive to feedback — quickly incorporating...

    $600-$800

    Price

    10 days

    Duration

    Helpful?
    Yes
    No
Reviews

2 reviews for this Gig
5.0

(2)
(0)
(0)
(0)
(0)
Rating Breakdown
  • Seller communication level
    5
  • Quality of delivery
    5
  • Value of delivery
    5
Sort By
Most relevant
  • B

    broke6699

    TR

    Turkey

    5

    Great experience working with Niladri. Strong technical skills, clear communication, and delivered a fully working encrypted E2E flow as expected. Very reliable — looking forward to continuing the collaboration.

    $800-$1,000

    Price

    11 days

    Duration

    Helpful?
    Yes
    No
  • B

    broke6699

    TR

    Turkey

    5

    Niladri delivered a solid end-to-end relayer MVP for our protocol. The architecture was well thought out, especially around the Waku-based intent flow, queue/worker execution, and overall system design. Communication was clear throughout, and he was very responsive to feedback — quickly incorporating...

    $600-$800

    Price

    10 days

    Duration

    Helpful?
    Yes
    No

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