Tokyo, Japan · Available for collaboration

Building the future on-chain.

Software engineer and entrepreneur building decentralized systems across Cardano, Solana, Ethereum, and beyond — at the intersection of code and real-world industry since 2010.

View GitHub Explore work ↓

Experience

15+ yrs

Born

Where zero was born

Working

Where the sun rises first

About

Engineer.
Builder.
Entrepreneur.

I'm Sarveshwar Singh — a software engineer and entrepreneur based in Tokyo, Japan. With over 15 years in the industry, I specialise in building decentralised systems, blockchain infrastructure, and enterprise software across retail, HR, and real estate sectors.

Deep in the Ethereum ecosystem since its early days, I work with Cardano, NFTs, IPFS, and smart contract platforms. I believe the most important software isn't just technically sound — it solves real human problems.

My focus is on solutions that remove friction — moving systems from trust-based to trustless. I'm drawn to the digitization and tokenization of real-world assets, decentralized digital identity (DID), and public-good infrastructure — especially governance and civic-tech projects built with governments like India, Japan, and beyond.

Blockchain Ethereum Cardano IPFS NFT Solidity Node.js React Tokyo

Software Engineering

Full-stack development since 2010, specialising in distributed systems and Web3 infrastructure.

Blockchain & Web3

Building on Ethereum, Cardano, IPFS. Smart contracts, DeFi, and NFT platforms.

Entrepreneurship

Founding and scaling ventures in retail, HR, and real estate within Tokyo's startup community.

Global Mindset

Multilingual professional. Building bridges across cultures, industries, and technology ecosystems.

Focus Areas

Where I spend my energy

Blockchain Infrastructure

Building decentralised protocols and smart contract systems on Ethereum and Cardano. From DeFi primitives to NFT platforms and IPFS-based storage solutions.

Web3

Enterprise Software

Developing scalable software solutions for retail operations, HR management, and real estate platforms. Focused on operational efficiency and data-driven decision making.

Startup

Community & Ecosystem

Active in Tokyo's entrepreneurial community. Connecting founders, engineers, and business leaders to accelerate innovation across sectors in Japan's unique market.

Tokyo

Notable Work

Selected contributions & projects

Six years of Ethereum smart-contract development — designing and shipping marketplace architecture for SBI Group companies, alongside open-source contributions to Cardano infrastructure.

EMURGO · Cardano

Open-source Contribution

Yoroi Wallet

Contributed to Yoroi, EMURGO's light wallet for Cardano — across the browser extension, mobile apps, and Ledger hardware bridge.

View on GitHub ↗

SBI Traceability

RWA Marketplace Architecture

SBI Traceability RWA Marketplace

Designed and built the SBI Traceability RWA marketplace smart-contract architecture for SBI Traceability — tokenizing real-world assets with on-chain provenance and traceability.

Visit site ↗

SBINFT

Smart Contract Architecture

SBINFT NFT Marketplace

Designed and built the smart-contract architecture for SBINFT's NFT marketplace — multi-chain minting, trading, and secondary-market flows across Ethereum, Polygon, and Oasys.

View project ↗

Tech Stack

Tools of the trade

A curated set of technologies I reach for when building serious products — from smart contracts to full-stack web applications.

Blockchain

Ethereum Cardano Solidity IPFS NFT Standards Web3.js Ethers.js

Frontend

React TypeScript Next.js Tailwind CSS

Backend & Infra

Node.js Python PostgreSQL Docker AWS

Languages

Japanese · JLPT N2 Hindi English

Currently Learning

AI Engineering ZK Proofs Layer 2 Protocols

Services

How I can help

Whatever you're building, scaling, or trying to make possible — here's where I can plug in.

Smart Contract Audit & Consultation

Manual, human review of smart contracts across EVM chains, Solana, and Cardano Plutus — catching vulnerabilities automated scanners miss.

EVM · Solana · Plutus

Smart Contract Development

Design and ship production smart contracts across EVM, Solana, and Cardano Plutus — from DeFi primitives to marketplace architecture.

EVM · Solana · Plutus

Mobile App Development

Native and cross-platform mobile apps built for performance, reliability, and scale.

iOS · Android

Web App Development

Full-stack web applications — from dashboards and marketplaces to blockchain-integrated dApps.

Full-stack

Business Expansion & Market Research

Strategy, market research, and execution guidance for scaling operations — especially entering or growing in Japan's market.

Strategy

Custom Software Development

Tailored software for the problems off-the-shelf tools can't solve.

Bespoke

Authentic Yoga

Authentic yoga instruction — asana, breath, and discipline — for individuals or teams.

Wellness

Challenge the Impossible

Bring your hardest problem — the one everyone else says can't be done. Let's find a way.

Bold

Tokyo Badminton Circle

I manage one of Tokyo's biggest badminton groups. Love the sport? Let's play.

Community

Connect

Let's build something meaningful.

Open to interesting projects, collaborations, and conversations — especially at the frontier of blockchain, enterprise software, and the Japanese market.