Security engineer / Web3 developerOpen to opportunities

Ideas into code. Security into everything.

Nayan
Joshy.

Building systems
you can trust.

From post-quantum wallets to defensive infrastructure, I build at the intersection of cybersecurity and Web3.

Explore my work GitHub

Nayan Joshy, cybersecurity specialist and Web3 developer — NAYAN JOSHYBASED IN LITHUANIA ↗

CybersecurityPost-quantum cryptographyWeb3 development

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01 /Selected work

Built to solve.
Designed to hold up.

All repositories

Cryptography × account abstraction

A wallet for the
post-quantum world.

PQ-EVM Account explores a new layer of wallet security: hybrid ECDSA and hash-based signatures, verified directly on Ethereum. Built in Solidity, tested with Foundry, and executed on Sepolia.

SolidityFoundrySPHINCS⁻ERC-4337

View source Read the write-up

Hybrid verification flow

User operationECDSA + SPHINCS⁻ signature

Hybrid verifierBoth signatures required

ERC-4337 EntryPointVerified operation → execution

Hash-based security. Zero protocol changes.

105.7koptimized verification gas

3,704signature bytes

0protocol changes

Get hands-on: explore signature verification

One changed bit should invalidate a signature. Generate a sample, verify it, then change a bit to see the difference. This is a local byte-comparison illustration, not real SPHINCS⁻ cryptography or an on-chain transaction.

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Generate a sample signature to get started.

Research-stage project · experimental and unaudited. View the Sepolia transaction

02 / SentinelBridge

Monitor

Detect

Protect

Bridge activity → anomaly detection → circuit breaker

SentinelBridge

A liquidity watchdog for cross-chain bridges. AI-assisted monitoring connects anomaly detection to an automated circuit breaker.

Groq AINext.jsSolidity

03 / Tokenomics Lab

Contract

Liquidity

Distribution

Multi-chain signals. One clearer risk picture.

Tokenomics Lab

A multi-chain token risk platform combining a 10-factor scoring model with AI-assisted contract inspection and scam classification.

TypeScriptGroq / GeminiFirebase

Curious by nature.
Defensive by instinct.

Lithuania, European Union

I’m Nayan, an Information Systems & Cyber Security specialist who likes understanding how things work—and what happens when they don’t.

My work moves between security operations, Linux infrastructure, and smart contracts. I’m especially interested in the point where cryptographic research meets real engineering constraints: gas limits, test coverage, and systems people can actually use.

Open to security engineering rolesMore about me

03 /What I bring to the table

Depth in security.
Range across the stack.

Smart contracts & Web3

Developing smart accounts, modeling threats, and testing the assumptions behind on-chain security.

Solidity · Foundry · Hardhat · Slither

Security operations

Investigating signals, analyzing network traffic, and turning detection into a practical response.

Splunk · Snort · Wireshark · SIEM

Linux & automation

Hardening systems and automating the repetitive work that keeps infrastructure dependable.

Bash · systemd · UFW · Python

Applications & infrastructure

Bringing ideas into working applications with considered interfaces and repeatable deployments.

Next.js · Docker · Ansible · AWS

04 /Good things start with a conversation

Let’s build
what’s next.

Have a security challenge, an interesting project, or a role in mind? I’d love to hear about it.

nayanjoshymaniyathjoshy@gmail.com

NayanJoshy.

Built to solve.Designed to hold up.

A wallet for thepost-quantum world.