Job Description

N3XT is a Wyoming-chartered Special Purpose Depository Institution (SPDI). We are a 100% reserved, non-lending bank designed to serve as a secure bridge between traditional capital markets and public blockchain infrastructure. Backed by

Paradigm

,

HACK VC

,

Winklevoss Capital

, and

Pharsalus

, we prioritize safety and transparency for institutional B2B clients.

Position Summary

As a Security Engineer focused on blockchain and digital assets, you will be the primary architect of our defense-in-depth strategy. You will secure the end-to-end lifecycle of our digital assets--from low-level cryptographic key management and node infrastructure to the auditing of high-level protocol logic. You will work closely with Infrastructure and Software teams to build automated surveillance systems that protect our "Hardened Production Environment".

#

Key Responsibilities (Security & Research Focus)

Threat Modeling & Vulnerability Management:

Proactively identify, assess, and mitigate security risks across our institutional-grade custody infrastructure and blockchain integrations.

Cryptographic Security Design:

Design and audit secure key management architectures using

FIPS 140-2/3 Level 3 HSMs

and

MPC/Threshold Signature Schemes

.

Smart Contract & Protocol Auditing:

Conduct rigorous internal audits and formal verification of smart contracts to prevent vulnerabilities like reentrancy, overflow, or logic errors.

On-Chain Surveillance & Incident Response:

Build and maintain real-time monitoring tools to detect unauthorized private key usage, contract exploits, or anomalous liquidity movements. Lead the incident response process for all digital asset security events.

Security Policy & Compliance:

Partner with Compliance to translate regulatory requirements (AML/KYC, SOC 2) into protocol-level technical controls.

Infrastructure Security Design:

Ensure the integrity of our multi-provider node infrastructure by implementing strict network isolation (VPC), TLS pinning, and 2-of-3 validation checks.
#

Operational & Engineering Responsibilities

Security Automation:

Build and integrate automated security scanning, fuzz testing, and formal verification into our

CI/CD

pipelines.

Hardened Infrastructure:

Utilize

Terraform

and

Kubernetes

to deploy secure, immutable infrastructure components.

Secure Governance Ceremonies:

Design and oversee high-security "Key Ceremonies" and multi-signature governance workflows (Safe/Squads).
#

What We're Looking For

Cybersecurity & Blockchain Background:

5+ years in Information Security or Security Engineering, with at least 2 years focused on securing digital asset ecosystems or DeFi protocols.

Deep Cryptography Knowledge:

Advanced understanding of cryptographic principles (Digital Signatures, Hash Functions, MPC, TSS).

Protocol Proficiency:

Deep, demonstrable understanding of how different blockchains function at a protocol level (EVM and Solana).

Programming Expertise:

Strong command of

Solidity

and

Rust

, with the ability to "think like an attacker" to find novel edge cases.

DevOps Fundamentals:

Proficiency in

Terraform

,

Kubernetes

, and automated

CI/CD

workflows.
#

Nice to Haves

Regulated Industry Experience:

Prior experience in

Banking

or

Finance

-specific cybersecurity roles.

Incident Response:

Experience with forensic analysis of on-chain exploits and cross-chain fund recovery. *

Certifications:

OSCP, CISSP, or specialized Blockchain Security certifications.