Product Security Engineer

Hashgraph

Product Security Engineer ensuring security in the product development lifecycle at Hedera, a leading blockchain company.

Posted 5/29/2026full-timeRemote • 🇮🇳 IndiaMid-LevelSeniorWebsite

Tech Stack

Tools & technologies

JavaOracleRustWeb3

About the role

Key responsibilities & impact

Conduct end-to-end security assessments of blockchain-based systems, from cryptographic primitive design and protocol architecture through smart contract implementation and deployed infrastructure.
Find real vulnerabilities through hands-on review, adversarial testing, and proof-of-concept exploit development, not just automated scanning.
Design adversarial test cases and proof-of-concept exploits for Hedera-native services, EVM-compatible contracts, cross-chain bridges, and consensus-layer components.
Own threat modeling and security architecture reviews across product phases.
Define and enforce security gates before new components reach production.
Partner directly with engineering teams to translate cryptographic and protocol-level risks into concrete, prioritized remediation work.
Build and improve security tooling, fuzzing infrastructure, and CI/CD security automation to scale security coverage without scaling headcount.
Track emerging blockchain and web3 attack patterns, map them to the internal codebase, and drive proactive mitigation before threats materialize.

Requirements

What you’ll need

Hands-on vulnerability discovery and security testing across blockchain protocols, smart contracts, nodes, and APIs.
A track record of catching real bugs, not just running automated scans.
Strong threat modeling and security architecture review experience applied to distributed cryptographic systems.
Experience assessing cross-chain protocols, threshold signature schemes, or other cryptographic systems with complex trust assumptions.
Deep working knowledge of applied cryptography, including BLS signatures, pairing-based schemes, polynomial commitments, and Fiat-Shamir constructions.
Ability to reason about cryptographic failure modes and how they show up in production systems.
Direct experience auditing or breaking a cross-chain bridge.
Ability to reason through trust model tradeoffs, including state proof, multisig, and oracle attestation models, and what each means for the attack surface.
Blockchain security and secure coding practices across EVM-compatible and non-EVM chains.
Security testing tooling, including static analysis, dynamic analysis, and fuzzing.
Experience developing custom fuzzing harnesses or security test infrastructure.
Ability to read and audit Rust and/or Java cryptographic code.
Understanding of memory safety, constant-time correctness, secret handling, and security risks at JNI boundaries.

Benefits

Comp & perks

Health insurance
401(k) matching
Flexible work hours
Paid time off
Remote work options

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills & Tools

vulnerability discoverysecurity testingthreat modelingsecurity architecture reviewapplied cryptographyBLS signaturespairing-based schemespolynomial commitmentsFiat-Shamir constructionssecure coding practices

Soft Skills

problem-solvingcollaborationcommunicationanalytical thinkingattention to detail