Web3 & Fintech Development
I help startups and enterprises build secure fintech apps, NFT platforms, and scalable SaaS products. From smart contracts to digital banking solutions, I deliver results that drive business growth.
About Harmeet
Harmeet Singh
Web3 & Fintech Developer | 50+ Projects Delivered
Hi, I'm Harmeet Singh, a Web3 & Fintech specialist with 7+ years of experience helping startups and enterprises build secure, scalable applications that drive business growth.
I specialize in delivering end-to-end solutions—from secure smart contracts and digital banking platforms to scalable SaaS products and NFT marketplaces that generate real business value.
Over 50+ successful projects, I've helped clients raise $2M+ in funding while delivering solutions 40% faster than industry average, with 99% on-time delivery and 99.9% uptime.
Ready to transform your business with Web3 and Fintech solutions? Let's discuss your project goals.
My Business Approach
Fast Delivery | Security First | Direct Communication
I focus on delivering business results, not just code. My approach combines proven Web2 methodologies with cutting-edge Web3 innovations to create solutions that drive real business growth. I stay ahead of industry trends to ensure your projects are built for today's market and tomorrow's opportunities.
Security and compliance are non-negotiable in my work. Whether building fintech applications or smart contracts, I implement enterprise-grade security practices and ensure audit-ready code. This is crucial for building trust with users and meeting regulatory requirements in the financial technology space.
Ready to transform your business with Web3 and Fintech solutions? Let's discuss how I can help you build secure, scalable applications that drive growth and deliver real business value.
Technology Stack
Frontend & UI
React
Angular
Vue.js
Svelte
Redux
Next.js
TypeScript
JavaScript
RxJSBackend & APIs
Node.js
Mongoose
Sequelize
Redis
gRPC
HTTP
REST APIs
Microservice
API DevDatabases
MySQL
MongoDB
PostgreSQL
TimescaleDB
CassandraRedis
DB Arch
Redis Streams
MemcachedDevOps & Cloud
AWS EC2
AWS Lambda
AWS EKS
AWS ECS
AWS ECR
Docker
DevOps
Cloud Infra
DeploymentWeb3 & Blockchain
Ethereum
Bitcoin
Binance
Polygon
Solidity
MetaMask
WalletConnect
Coinbase
BitGo← Swipe to explore all technology categories →
What I Bring
Fast Delivery
40% faster than industry average with quality maintained. Get your project to market quicker without compromising on excellence.
Security First
Code built for audits & compliance. Enterprise-grade security practices ensure your applications meet regulatory standards.
Direct Communication
Work directly with me, no middlemen. Faster decisions, better results, and transparent project management.
Project Experience
Custodial & Non-Custodial Wallets
Built 12+ secure crypto wallets supporting 8+ blockchains with 99.9% uptime
NFT & Gaming Projects
Developed 8+ NFT marketplaces and blockchain games with 50K+ active users
Smart Contract Projects
Built custom Biconomy NFT governance and Uniswap-based smart contracts
ICO Projects
Launched 10+ successful ICOs raising $5M+ in funding
MLM Products
Built 5+ multi-level marketing platforms with 25K+ registered users
SaaS Products
Created 12+ subscription platforms generating $500K+ in recurring revenue
Career Journey
Tech Lead
Leading technical strategy and architecture for Web3 projects, managing development teams and driving innovation
Senior Full-Stack Developer
Led development of scalable Web3 applications and mentored junior developers, transferred to Tech Lead role
Full-Stack Developer
Built 20+ client projects using React, Node.js, and modern web technologies
Frontend Developer
Engineered responsive frontend applications and optimized performance by 60% for high-traffic e-commerce platforms
Javascript Developer
Started career with building a SAAS Product and learning modern web technologies
Why Choose Me
Fast Delivery
40% faster than industry average with quality maintained
Security First
Code built for audits & compliance
Direct Communication
Work directly with me, no middlemen
Services & Solutions
Core Expertise
Smart Contracts & NFT Platforms
Build secure smart contracts and NFT marketplaces that scale to millions of users with 99.9% uptime and gas-optimized transactions.
Digital Banking & KYC/AML
Complete fintech solutions with automated KYC/AML compliance, digital banking infrastructure, and secure payment processing.
Multi-Chain Wallet Solutions
Enterprise-grade cryptocurrency wallets with MPC security supporting 20+ blockchains, trusted by 50K+ users worldwide.
SaaS Product Development
Scalable SaaS applications with microservices architecture, real-time features, and automated scaling for growing businesses.
Cloud Infrastructure & DevOps
AWS deployments with CI/CD pipelines, monitoring, and infrastructure automation for 99.9% uptime and cost optimization.
Payment Gateway Integration
Seamless fiat-to-crypto onramps with Banxa, Paybis integration, and custom payment solutions for global markets.
API Development & Integration
High-performance APIs with gRPC communication, Redis caching, and message queues for enterprise applications.
Token Sale & ICO Platforms
Secure ICO platforms with real-time dashboards, automated token distribution, and compliance features for successful launches.
Portfolio Projects
Jiggle Wallet
Secure, scalable crypto wallet with MPC-enhanced security and multi-chain operations. Built with threshold cryptography and seamless fiat-to-crypto integration.
Fanverse
Web3 platform with ERC-1155 smart contracts, lazy minting, and Web3Auth integration. Reduced gas costs by 60% and onboarding friction by 70%.
Risely (Fintech)
End-to-end fintech platform with scalable microservices, KYC/AML compliance, and Rust-based MPC security. Achieved 99.8% uptime and processed $10M+ transactions.
Use Cases Real-World Applications
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Multichain Portfolio Scraper
Web3 & Data EngineeringFake Token Filtering & Rate-Limited Scraping Pipeline
Challenge
Building a scalable, rate-limited scraping system that aggregates multichain portfolio balances from EVM-based blockchain explorer websites, filters out fake tokens, and maintains accurate balance data for 240k+ wallet addresses.
Solution
Developed a comprehensive scraping pipeline with Playwright for dynamic page navigation and Cheerio for HTML parsing. Implemented CoinMarketCap API integration for fake token validation, checking circulating supply, market cap, and verification status. Built a Token Bucket Algorithm for rate limiting (60 requests per 15 seconds) to avoid IP blocking. Used BullMQ with Redis for task queuing, processing 240k+ wallets with 5 concurrent workers handling 80-address batches. Deployed PostgreSQL for persistent storage with bulk operations ensuring data consistency.
Technologies
Key Metrics
MPC (Multi-Party Keychain) Service
Web3 & SecurityGG20 & AWS TEE - Secure Private Key Management
Challenge
To create a secure private key management system where no single entity ever holds the complete private key, reducing the risk of key compromise and enabling secure multi-party transaction signing for blockchain operations.
Solution
Implemented MPC (Multi-Party Computation) with GG20 protocol in Rust, splitting private keys into multiple shards distributed across different participants. Deployed MPC shards in AWS TEE (Trusted Execution Environment) enabled EC2 instances for isolated, serverless execution. Built threshold signing mechanism where transaction signing requires threshold number of shards to participate, with partial signatures combined into full serialized signature without ever reconstructing the private key. Created secure transaction flow where user initiates request, MPC nodes inside TEE generate partial signatures using private key shards, signatures are aggregated into single serialized signature, and final signature is broadcasted to blockchain for execution.
Technologies
Key Metrics
What People Say
Harmeet understood our vision perfectly and suggested improvements we hadn't thought of. The wallet integration was smooth and secure. He made multi-chain support look easy. Would definitely work with him again.
Karan Sharma
Engineering Lead
Excellent communication throughout the project. Harmeet explained complex DeFi concepts clearly and kept us updated. The platform is still running smoothly after 8 months. His attention to detail made all the difference.
Harmesh Kaur
Product Manager
Harmeet's expertise in NFT development and smart contract auditing was invaluable. He built our platform and ensured it was secure and scalable.
David K.
Founder
Harmeet's full-stack development skills are outstanding. He built our entire platform from frontend to backend, including complex blockchain integrations.
Emily Rodriguez
Engineering Lead
Ready to Build Your Project?
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Ready to Build Your Project?
Let's discuss your Web3, Fintech, or Full-Stack development needs. I'm here to help bring your ideas to life with 7+ years of experience and 70+ successful projects.
contact@harmeet.io
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+91 95014 01193
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@harmeet_io
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Trusted by clients worldwide
US, EU, and Asia
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