---
title: 'Expression of Interest at Sigma Prime'
canonical: 'https://feeny.ai/job/expression-of-interest-sigma-prime-global-1nh3v9gsjn82'
type: 'job'
last_seen: '2026-09-08'
---

# Expression of Interest at Sigma Prime

- **Company:** Sigma Prime
- **Location:** Global
- **Employment:** full-time
- **Work type:** remote
- **Posted:** 2026-08-05
- **Last confirmed live:** 2026-09-08
- **Apply:** https://jobs.ashbyhq.com/sigp/ea3f72b7-46fa-4382-b817-091eae6a629b

## Job description

Don’t see a role that fits? We’d still love to hear from you.

Sigma Prime is a remote-first team building and securing critical infrastructure across the Ethereum ecosystem. Founded in Sydney, Australia, our team now works remotely from around the world.

Alongside security assessments and protocol research, we build and maintain production infrastructure, including Lighthouse, one of the most widely used Ethereum consensus clients, Bombora, our Ethereum block builder, Anchor, an implementation of the SSV protocol, and Secstant, our security tooling platform.

We value people who are curious, collaborative, and generous with their knowledge, who enjoy solving difficult technical or operational problems.

If you think you’d be a good fit, we’d love to hear from you. We review expressions of interest on a rolling basis and will reach out if a suitable opportunity comes up.

## About Sigma Prime

## Company Overview
- **One-liner**: Sigma Prime is a specialist blockchain security and infrastructure firm that audits protocols, builds critical Ethereum infrastructure (including the Lighthouse consensus client), and operates production blockchain systems.
- **Entity Type**: Private (bootstrapped/profitable services business)
- **Headquarters**: Sydney, Australia
- **Founded**: 2016
- **Founders**: Mehdi Zerouali, Adrian Manning, Paul Hauner

## Core Business
- **Primary industry**: Blockchain security, infrastructure engineering, and protocol research
- **Target customers**: Blockchain protocols, DeFi projects, L2 networks, and institutional staking operators (B2B, Enterprise)
- **Mission or purpose**: To help secure complex blockchain systems and build open-source infrastructure that strengthens the Ethereum ecosystem, envisioning a future that is open, fair, and decentralized.

## Products & Services

- **[Security Audits](https://sigmaprime.io/services/)**: Specialist reviews covering smart contracts (Solidity, Vyper, Rust, Move, Cairo), blockchain protocols (consensus, networking, execution, bridges, L2s), infrastructure (deployment pipelines, signer boundaries), and frontend applications. Over 400 audits completed with 6,500+ total findings.
- **[Lighthouse](https://sigmaprime.io/)**: Open-source Rust Ethereum consensus client — one of the most widely deployed consensus clients on Ethereum, critical for network client diversity.
- **[Bombora](https://sigmaprime.io/)**: Ethereum block builder contributing to block production across the PBS supply chain.
- **[Anchor](https://sigmaprime.io/)**: Rust SSV protocol implementation for distributed validator technology (DVT), in production.
- **[Secstant](https://sigmaprime.io/)**: Security review tooling currently under development.
- **[Blockchain Infrastructure Operations](https://sigmaprime.io/services/)**: Selective operator roles in staking and sequencer sets, including Lido DVT operations (~$0.5B of Lido stake) and ~7% of the Aztec sequencer set.
- **[Embedded Security Support](https://sigmaprime.io/services/)**: Recurring senior security guidance for teams across engineering, releases, and risk decisions.
- **[Security Training](https://sigmaprime.io/services/)**: Practical, role-specific training for engineers, operators, and leadership teams working on high-value blockchain systems.

## Market Standing
- **Valuation/Market Cap**: Not publicly available (private, profitable services firm)
- **Key Metric**: TVL protected across audited protocols exceeds $57 billion; team of ~33-35 employees
- **Notable Clients/Partners**: Mantle (L2 Rollup), Botanix (Bitcoin L2), Berachain, Lido, Aztec, and "the largest names in the industry" per their website.
- **Growth Signals**: Headcount grew 20.6% year-over-year (to ~33 employees); team is globally distributed across 14 countries; expanding from pure auditing into infrastructure operations and security tooling (Secstant).

## Competitive Advantages
- **Deep Ethereum expertise**: Founded in 2016, they have nearly a decade of specialization in Ethereum security — one of the earliest firms to focus on this niche.
- **Open-source infrastructure ownership**: They build and maintain Lighthouse, a critical piece of Ethereum infrastructure, giving them unique insight into protocol internals that informs their audit quality.
- **Full lifecycle security**: Unlike pure auditors, they operate production infrastructure (staking, block building, sequencers), which sharpens their practical security knowledge.
- **Long-term client relationships**: Engineers who understand a client's architecture and threat model over time provide deeper, faster subsequent engagements.
- **Research-led approach**: Founders and directors are active contributors to ecosystem security initiatives (Security Alliance/SEAL, government regulatory discussions) and publish research on node security, bridge vulnerabilities, and networking protocols.

## Strategic Focus
- **Expanding beyond audits**: Growing infrastructure operations (staking, block building, DVT) and developing security tooling (Secstant) to become a more integrated security partner.
- **Strengthening client diversity**: Building multiple independent infrastructure components (Lighthouse, Bombora, Anchor) to reduce single points of failure in Ethereum.
- **Deepening embedded support**: Offering recurring security leadership for teams that need ongoing senior guidance, not just one-off audits.
- **Global talent acquisition**: Hiring remotely across engineering, DevOps, and technical account management roles to access a worldwide pool of blockchain security talent.

## Why Work Here
- **Culture**: Deeply technical, research-driven, and open-source oriented. The team is composed of researchers, developers, and security engineers who are passionate about decentralization and Ethereum's resilience.
- **Remote/Hybrid Policy**: Remote-first with headquarters in Sydney, Australia. Team is distributed across 14 countries (including US, Spain, Canada, Ukraine, Croatia, and others). In-office or remote options available depending on location.
- **Impact**: Work on the most critical blockchain infrastructure in the industry — your audits and code directly secure billions of dollars in value. Contribute to open-source software used by the entire Ethereum network.
- **Team composition**: ~61% of employees are in technical roles; the team includes specialists (44%), management (24%), and directors (12%). Flat, expert-driven structure.
- **Notable perks**: Opportunity to work on cutting-edge problems at the intersection of security research, protocol engineering, and production infrastructure. Deep involvement in the Ethereum ecosystem and open-source community.

## Sources
1. [Sigma Prime Official Website](https://sigmaprime.io/)
2. [Sigma Prime About Page](https://sigmaprime.io/about/)
3. [Sigma Prime Services Page](https://sigmaprime.io/services/)
4. [Sigma Prime LinkedIn](https://au.linkedin.com/company/sigmaprime)
5. [Sigma Prime on Built In](https://builtin.com/company/sigma-prime)
6. [Sigma Prime Careers Page](https://jobs.ashbyhq.com/sigp)

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