Book.
Secure.
Relax.
Oak Security offers audits, penetration testing, training, and advisory
Oak Security offers audits, penetration testing, training, and advisory
600+
engagements
completed
engagements completed
Services
Our specializations
EVM (Solidity)
EVM (Solidity)
EVM (Solidity)
Solana
Solana
Solana
Cosmos (CosmWasm)
Cosmos (CosmWasm)
Cosmos (CosmWasm)
Polkadot/Substrate (ink!)
Polkadot/Substrate (ink!)
Polkadot/Substrate (ink!)
Stellar (Soroban)
Stellar (Soroban)
Stellar (Soroban)
Rust
Rust
Rust
Consensus Protocols/Light Clients
Consensus Protocols/Light Clients
Consensus Protocols/Light Clients
Virtual Machines
Virtual Machines
Virtual Machines
Cryptographic Primitives
Cryptographic Primitives
Cryptographic Primitives
DeFi
DeFi
DeFi
Liquid Staking/Restaking
Liquid Staking/Restaking
Liquid Staking/Restaking
Cross-Chain Bridges/Sequencers
Cross-Chain Bridges/Sequencers
Cross-Chain Bridges/Sequencers
Off-chain Infrastructure
Off-chain Infrastructure
Off-chain Infrastructure
Request a quote
Talk to us
Request a quote
Talk to us
Request a quote
Talk to us
Testimonials
Jia Jian Goi
Product Lead, SatLayer
“We’re deeply grateful to Oak Security for their audit of Cube by SatLayer, our Babylon liquid staking protocol. The audit covered our CosmWasm contracts for deployment on Babylon Genesis, and we were consistently impressed by Oak’s deep technical insight into the Cosmos stack and CosmWasm. Having worked with various auditors, we found Oak’s thoroughness, clarity of communication, and practical recommendations to be a cut above. We would absolutely recommend Oak Security to any team building in Cosmos or on Babylon.”
Jacob Kowalewski
CSO, t3rn
"If more projects had auditors like Oak Security, the industry would be in a substantially better place. I can't overstate how much myself, Maciej and the whole team appreciate their incredible input. Once again, amazing work!"
Testimonials
Jia Jian Goi
Product Lead, SatLayer
“We’re deeply grateful to Oak Security for their audit of Cube by SatLayer, our Babylon liquid staking protocol. The audit covered our CosmWasm contracts for deployment on Babylon Genesis, and we were consistently impressed by Oak’s deep technical insight into the Cosmos stack and CosmWasm. Having worked with various auditors, we found Oak’s thoroughness, clarity of communication, and practical recommendations to be a cut above. We would absolutely recommend Oak Security to any team building in Cosmos or on Babylon.”
Meet our team
Our 50+ security researchers hold Master's and PhDs in Computer Science, Cryptography, Economics, Engineering, and Finance, allowing us to provide you with in-depth and holistic services. We work with a distributed pool of the industry’s best security experts, allowing us to expand on-demand.
Below, you can find selected profiles of our 50+ security experts.
Dr. Stefan Beyer
Co-Founder & Managing Director
Leads Oak Security’s operational security services and blockchain infrastructure reviews.
20+ years in distributed systems and cybersecurity; smart contract auditor since 2017.
PhD in Operating Systems; expert in consensus protocols like PBFT.
Dr. Stefan Beyer
Co-Founder & Managing Director
Leads Oak Security’s operational security services and blockchain infrastructure reviews.
20+ years in distributed systems and cybersecurity; smart contract auditor since 2017.
PhD in Operating Systems; expert in consensus protocols like PBFT.
Philip Stanislaus
Co-Founder & Managing Director
MPhil in Economics from Cambridge; active in blockchain engineering since 2018.
Architected Polkadot pallets, Cosmos SDK modules, and bridges across ecosystems.
Oversees internal audit processes and security standards at Oak Security.
Philip Stanislaus
Co-Founder & Managing Director
MPhil in Economics from Cambridge; active in blockchain engineering since 2018.
Architected Polkadot pallets, Cosmos SDK modules, and bridges across ecosystems.
Oversees internal audit processes and security standards at Oak Security.
Dr. Jan Philipp Fritsche
Managing Director & Head of Economics Advisory
PhD in Economics; former advisor to the ECB, Deutsche Bank, and European Parliament.
10+ years in risk modeling, econometrics, and macro-financial systems.
Leads Oak Security’s economics advisory services; reviewed 40+ blockchain protocols.
Dr. Jan Philipp Fritsche
Managing Director & Head of Economics Advisory
PhD in Economics; former advisor to the ECB, Deutsche Bank, and European Parliament.
10+ years in risk modeling, econometrics, and macro-financial systems.
Leads Oak Security’s economics advisory services; reviewed 40+ blockchain protocols.
Kateryna Yakovenko
Delivery Manager
Business Analyst & Project Manager with a degree in Applied Mathematics.
Coordinates auditors and clients and serves as the bridge between them to deliver audits and audit reports
Led digital system design for the Ukrainian Border Guard Service.
Kateryna Yakovenko
Delivery Manager
Business Analyst & Project Manager with a degree in Applied Mathematics.
Coordinates auditors and clients and serves as the bridge between them to deliver audits and audit reports
Led digital system design for the Ukrainian Border Guard Service.
Bernd
Lead Blockchain Security Auditor
Completed 100+ audits across DeFi, wallets, bridges, and VMs (e.g., FEVM).
Top-ranked on Code4rena, Sherlock, and CodeHawks, with 17 top-3 placements including 7 first-place finishes.
Specialized in Solidity, Rust, Go, the Cosmos ecosystem (Cosmos SDK, CosmWasm), and complex bridging protocols.
Bernd
Lead Blockchain Security Auditor
Completed 100+ audits across DeFi, wallets, bridges, and VMs (e.g., FEVM).
Top-ranked on Code4rena, Sherlock, and CodeHawks, with 17 top-3 placements including 7 first-place finishes.
Specialized in Solidity, Rust, Go, the Cosmos ecosystem (Cosmos SDK, CosmWasm), and complex bridging protocols.
Jakub Heba
Lead Blockchain Security Auditor
9+ years in cybersecurity, including 3.5 years in Web3 security and blockchain auditing.
Conducted 130+ audits across smart contracts, L1 blockchains, and off-chain components, specializing in Rust, Golang, Move, CosmWasm, Sui, Aptos, Substrate, Solana, and EVM/Solidity.
Expert in low-level exploit development, penetration testing, and niche blockchain languages (Pact, Noir, Rell).
Jakub Heba
Lead Blockchain Security Auditor
9+ years in cybersecurity, including 3.5 years in Web3 security and blockchain auditing.
Conducted 130+ audits across smart contracts, L1 blockchains, and off-chain components, specializing in Rust, Golang, Move, CosmWasm, Sui, Aptos, Substrate, Solana, and EVM/Solidity.
Expert in low-level exploit development, penetration testing, and niche blockchain languages (Pact, Noir, Rell).
Dr. Stefan Beyer
Co-Founder & Managing Director
Leads Oak Security’s operational security services and blockchain infrastructure reviews.
20+ years in distributed systems and cybersecurity; smart contract auditor since 2017.
PhD in Operating Systems; expert in consensus protocols like PBFT.
Philip Stanislaus
Co-Founder & Managing Director
MPhil in Economics from Cambridge; active in blockchain engineering since 2018.
Architected Polkadot pallets, Cosmos SDK modules, and bridges across ecosystems.
Oversees internal audit processes and security standards at Oak Security.
Dr. Jan Philipp Fritsche
Managing Director & Head of Economics Advisory
PhD in Economics; former advisor to the ECB, Deutsche Bank, and European Parliament.
10+ years in risk modeling, econometrics, and macro-financial systems.
Leads Oak Security’s economics advisory services; reviewed 40+ blockchain protocols.
Kateryna Yakovenko
Delivery Manager
Business Analyst & Project Manager with a degree in Applied Mathematics.
Coordinates auditors and clients and serves as the bridge between them to deliver audits and audit reports
Led digital system design for the Ukrainian Border Guard Service.
Bernd
Lead Blockchain Security Auditor
Completed 100+ audits across DeFi, wallets, bridges, and VMs (e.g., FEVM).
Top-ranked on Code4rena, Sherlock, and CodeHawks, with 17 top-3 placements including 7 first-place finishes.
Specialized in Solidity, Rust, Go, the Cosmos ecosystem (Cosmos SDK, CosmWasm), and complex bridging protocols.
Jakub Heba
Lead Blockchain Security Auditor
9+ years in cybersecurity, including 3.5 years in Web3 security and blockchain auditing.
Conducted 130+ audits across smart contracts, L1 blockchains, and off-chain components, specializing in Rust, Golang, Move, CosmWasm, Sui, Aptos, Substrate, Solana, and EVM/Solidity.
Expert in low-level exploit development, penetration testing, and niche blockchain languages (Pact, Noir, Rell).
SuWu
Lead Blockchain Security Auditor
Conducted 100+ audits across Cosmos, Solana, NEAR, and Cadence/FunC.
OSCP & OSWE certified; ranked in Google’s Top 100 VRP hackers.
Background in Web2 pentesting, bug bounties, and L2 vulnerability research.
Christian Vari
Lead Blockchain Security Auditor
Master’s in Cybersecurity and Blockchain; specialized in distributed systems, Rust, and Go.
5 years of experience with 150+ audits across multiple ecosystems and audited critical codebases including Cosmos SDK, Interchain Security, Stellar, CosmWasm VM, Filecoin EVM, Polkadot EVM bridge, Solana programs and Move contracts on Aptos and Sui.
Former engineer at IBM/HCL working on distributed systems and schedulers.
Nadim Kobeissi
Applied Cryptographer
PhD in formal verification; performed 250+ security audits.
Built cryptographic tools and authored peer-reviewed research on ZK and messaging.t 2
Certified cryptography expert (France); former professor at NYU Paris and current professor at the American University of Beirut.
Björn Hanneke
Economist
Blockchain researcher and PhD candidate specializing in token design, incentive mechanisms, and decentralized market structures.
Investigates attack vectors in token economies, including airdrop resilience and manipulation risks and mitigation strategies.
Experienced strategy consultant with 8+ years advising financial institutions on digital transformation, automation, and market innovation, applying this expertise to design secure and resilient web3 systems.
Matthew Miles
Senior Blockchain Security Auditor
7+ years in blockchain R&D; led 50+ audits across L1s, ZKPs, and identity protocols.
Expert in Solidity, Rust, Go, and cryptographic primitives (SNARKs, STARKs, KZG, BLS).
Speaker at Google & Microsoft; co-authored papers on secure execution frameworks.
Colin Kelly
Senior Blockchain Security Auditor
Holds a degree in Cybersecurity and Risk Analysis from Pennsylvania State University; active in security since 2017.
Previous experience in purple team consulting for fortune 500 clients, and Cloud Security Engineering for a top Cybersecurity technology company.
Has been auditing with Oak since 2021 and has completed 100+ audits covering Cosmos SDK chains, CosmWasm smart contracts, Solana programs, custom crypto implementations, and protocol design reviews.
Lukasz Mikula
Senior Blockchain Security Auditor
10+ years of experience in offensive cybersecurity, including 3.5+ years in Web3 auditing smart contracts and blockchain apps.
Audited 80+ projects in multiple tech stacks: EVM (Solidity), Rust (Cosmwasm, Solana, Substrate), Move (Aptos, Sui) and TON; also assessed wallets, backend systems, and Metamask snaps.
Holds multiple certifications (OSCP, OSCE, eWPTXv2) and CVEs; placed in top 10 in Code4rena and Sherlock competitions.
Kirill Taran
Senior Blockchain Security Auditor
Master’s degree in Mathematics and Software Engineering; nearly 15 years of professional experience, including 5+ years in Rust/Web3 development (Substrate, CosmWasm, IBC).
Former Software Researcher at JetBrains specializing in formal verification of distributed algorithms; worked at Parity Technologies on EVM-compatibility (now Frontier).
Conducted 30+ blockchain audits at Oak Security, focusing on L1 networks, interoperability protocols, cross-chain DEXs, on-chain light clients, and bridges for Polkadot, Cosmos, and Ethereum ecosystems.
Mario Poneder
Senior Blockchain Security Auditor
Smart contract security researcher with a Master’s in Technical Physics and multiple top finishes in Web3 bug bounty contests.
Reviewed 60+ blockchain protocols across EVM, Substrate, Starknet, Solana and near, protecting $8B+ TVL in DeFi projects.
Broad software engineering background in C/C++, Rust, Python, GPU computing, and simulations, enabling rapid adaptation to new tech.
Values
Founder-led
Without VC funding, we have focused on sustainable growth without compromising on quality.
Agile
Our global pool of vetted senior security researchers allows us to expand on demand.
Relentless
Redundancy by design. Our work is conducted by multiple security researchers independently and simultaneously.
Reliable
We’ve been in the game since 2017, and have many of the top security experts in our team, including PhD economists and cryptographers.
IN THE PRESS
