A leading cybersecurity firm is seeking an Offensive Security Engineer fully remote based in the United Kingdom. The role involves conducting realistic adversary simulations, performing system and application testing, and developing security tools. Ideal candidates should have over 3 years of experience in Golang and C++, along with offensive security expertise. A passion for blockchain technologies and the ability to communicate complex technical content clearly is essential. Join a dynamic team focused on advancing cybersecurity in the cryptocurrency space.
03/02/2026
Full time
A leading cybersecurity firm is seeking an Offensive Security Engineer fully remote based in the United Kingdom. The role involves conducting realistic adversary simulations, performing system and application testing, and developing security tools. Ideal candidates should have over 3 years of experience in Golang and C++, along with offensive security expertise. A passion for blockchain technologies and the ability to communicate complex technical content clearly is essential. Join a dynamic team focused on advancing cybersecurity in the cryptocurrency space.
(Solana) Offensive Security Engineer - 100% Remote, Blockchain, DeFi About Halborn Inc Our mission is to provide value-add security services and products to the world's most cutting edge technology firms and that starts with blockchain tech. Founded in 2019, Halborn is an elite cyber security company focused on solving complex adversarial problems unique to the cryptocurrency and fintech industries. From breaches and social engineering to stolen private keys and economic hacks, Halborn solves it. Our clientele are the exclusive blockchain companies as well as new startups with high growth trajectories. Our Culture Halborn is a globally distributed team of 100+, looking to grow our elite team of white hat hackers, sales professionals, security engineers and DevSecOps specialists who value independence, want to make their own hours, work for themselves and have a passion for the ever evolving cryptocurrency industry. Our Commitment to Diversity Halborn Inc is an Equal Opportunity Employer. We do not discriminate based upon race, religion, color, national origin, sexual orientation, gender, gender identity, gender expression, transgender status, sexual stereotypes, age, education, status as a protected veteran, status as an individual with a disability, or other applicable legally protected characteristics and celebrates the diversity of its growing team. We are unable to sponsor or take over sponsorship of employment Visas at this time. Recruitment agencies and consultants may not submit resumes/CVs through this website or directly to managers. Halborn does not accept unsolicited agency resumes, and will not pay fees to any third-party agency or company that does not have a signed agreement with Halborn Inc. Responsibilities Conduct realistic adversary simulations from conception through reporting.Perform Testing systems, applications, networks and processes. Research cutting-edge offensive security techniques. Developing tools and exploits. Communicate clearly and effectively, both written and orally, the risks that exist and remediations required. Work collaboratively and independently on unique or special assignments which may require specialized knowledge and/or experience. Comply with Company, Division and Professional ethical standards. Requirements A passion for the cryptocurrency industry. Experience in smart contract audits (suggested). 5+ years of offensive security experience. 2+ years of experience auditing DeFi protocols (Solidity, Solana or any Rust-based protocol). Experience using common penetration testing tools, BurpSuite, Metasploit, etc. Proficient in at least 1 scripting language. Proficiency with common server and workstation operating systems. Mastery in testing modern web application languages and frameworks. Mastery in testing modern authentication systems and Identity Providers. Proficient knowledge of blockchain and smart contract implementations. Ability to think critically and identify areas of technical and non-technical risk. Ability to write technical reports and communicate technical content to non-technical audiences. Relevant security certifications are a plus, but not required (OSCP, OSCE, GPEN, GWAPT, LPT, CISSP). All candidates who make it past 2nd round will be required to: Pass background and criminal record check
03/02/2026
Full time
(Solana) Offensive Security Engineer - 100% Remote, Blockchain, DeFi About Halborn Inc Our mission is to provide value-add security services and products to the world's most cutting edge technology firms and that starts with blockchain tech. Founded in 2019, Halborn is an elite cyber security company focused on solving complex adversarial problems unique to the cryptocurrency and fintech industries. From breaches and social engineering to stolen private keys and economic hacks, Halborn solves it. Our clientele are the exclusive blockchain companies as well as new startups with high growth trajectories. Our Culture Halborn is a globally distributed team of 100+, looking to grow our elite team of white hat hackers, sales professionals, security engineers and DevSecOps specialists who value independence, want to make their own hours, work for themselves and have a passion for the ever evolving cryptocurrency industry. Our Commitment to Diversity Halborn Inc is an Equal Opportunity Employer. We do not discriminate based upon race, religion, color, national origin, sexual orientation, gender, gender identity, gender expression, transgender status, sexual stereotypes, age, education, status as a protected veteran, status as an individual with a disability, or other applicable legally protected characteristics and celebrates the diversity of its growing team. We are unable to sponsor or take over sponsorship of employment Visas at this time. Recruitment agencies and consultants may not submit resumes/CVs through this website or directly to managers. Halborn does not accept unsolicited agency resumes, and will not pay fees to any third-party agency or company that does not have a signed agreement with Halborn Inc. Responsibilities Conduct realistic adversary simulations from conception through reporting.Perform Testing systems, applications, networks and processes. Research cutting-edge offensive security techniques. Developing tools and exploits. Communicate clearly and effectively, both written and orally, the risks that exist and remediations required. Work collaboratively and independently on unique or special assignments which may require specialized knowledge and/or experience. Comply with Company, Division and Professional ethical standards. Requirements A passion for the cryptocurrency industry. Experience in smart contract audits (suggested). 5+ years of offensive security experience. 2+ years of experience auditing DeFi protocols (Solidity, Solana or any Rust-based protocol). Experience using common penetration testing tools, BurpSuite, Metasploit, etc. Proficient in at least 1 scripting language. Proficiency with common server and workstation operating systems. Mastery in testing modern web application languages and frameworks. Mastery in testing modern authentication systems and Identity Providers. Proficient knowledge of blockchain and smart contract implementations. Ability to think critically and identify areas of technical and non-technical risk. Ability to write technical reports and communicate technical content to non-technical audiences. Relevant security certifications are a plus, but not required (OSCP, OSCE, GPEN, GWAPT, LPT, CISSP). All candidates who make it past 2nd round will be required to: Pass background and criminal record check
Offensive Security Engineer - 100% Remote, Blockchain, DeFi About Halborn Inc Our mission is to provide value-add security services and products to the world's most cutting edge technology firms and that starts with blockchain tech. Founded in 2019, Halborn is an elite cyber security company focused on solving complex adversarial problems unique to the cryptocurrency and fintech industries. From breaches and social engineering to stolen private keys and economic hacks, Halborn solves it. Our clientele are the exclusive blockchain companies as well as new startups with high growth trajectories. Our Culture Halborn is a globally distributed team of 100+, looking to grow our elite team of white hat hackers, sales professionals, security engineers and DevSecOps specialists who value independence, want to make their own hours, work for themselves and have a passion for the ever evolving cryptocurrency industry. Our Commitment to Diversity Halborn Inc is an Equal Opportunity Employer. We do not discriminate based upon race, religion, color, national origin, sexual orientation, gender, gender identity, gender expression, transgender status, sexual stereotypes, age, education, status as a protected veteran, status as an individual with a disability, or other applicable legally protected characteristics and celebrates the diversity of its growing team. We are unable to sponsor or take over sponsorship of employment Visas at this time. Recruitment agencies and consultants may not submit resumes/CVs through this website or directly to managers. Halborn does not accept unsolicited agency resumes, and will not pay fees to any third-party agency or company that does not have a signed agreement with Halborn Inc. Responsibilities Conduct realistic adversary simulations from conception through reporting. Perform testing on systems, applications, networks, and processes. Research cutting-edge offensive security techniques. Develop tools and exploits. Communicate clearly and effectively, both written and orally, regarding risks and required remediations. Work collaboratively and independently on unique or specialized assignments requiring specific knowledge or experience. Comply with Company, Division, and Professional ethical standards. Qualifications A passion for the blockchain industry. 3+ years of experience in application development in Golang and C++ (both are mandatory) (blockchain or smart contract development experience is a plus). 2+ years of offensive security experience. Experience in WASM/BPF is a plus. Understanding of system administration and network administration. Experience using common penetration testing tools (BurpSuite, Metasploit, etc.). Practical reverse engineering and fuzzing experience is a plus. Proficient in at least one scripting language. Proficiency with common server and workstation operating systems. Proficient in testing modern web application languages and frameworks. Proficient knowledge of blockchain and smart contract implementations. Deep understanding of Golang-based smart contract runtimes. Ability to think critically and identify areas of technical and non-technical risk. Ability to write technical reports and communicate technical content to non-technical audiences. Experience in security research, including vulnerability discovery and exploit development. Bonus Points Experience working with Bitcoin or its forks (Bitcoin Cash, etc.). Experience working with Ethereum clients. Experience with Cosmos SDK and solid understanding of Tendermint. Experience with IBC (Inter-Blockchain Communication). Experience working with consensus protocols. Basic knowledge of cryptographic primitives such as public/private keys, hash functions, and Merkle trees (understanding how to use them, not implement them). Relevant security certifications are a plus but not required (OSCP, OSCE, GPEN, GWAPT, LPT, CISSP).
03/02/2026
Full time
Offensive Security Engineer - 100% Remote, Blockchain, DeFi About Halborn Inc Our mission is to provide value-add security services and products to the world's most cutting edge technology firms and that starts with blockchain tech. Founded in 2019, Halborn is an elite cyber security company focused on solving complex adversarial problems unique to the cryptocurrency and fintech industries. From breaches and social engineering to stolen private keys and economic hacks, Halborn solves it. Our clientele are the exclusive blockchain companies as well as new startups with high growth trajectories. Our Culture Halborn is a globally distributed team of 100+, looking to grow our elite team of white hat hackers, sales professionals, security engineers and DevSecOps specialists who value independence, want to make their own hours, work for themselves and have a passion for the ever evolving cryptocurrency industry. Our Commitment to Diversity Halborn Inc is an Equal Opportunity Employer. We do not discriminate based upon race, religion, color, national origin, sexual orientation, gender, gender identity, gender expression, transgender status, sexual stereotypes, age, education, status as a protected veteran, status as an individual with a disability, or other applicable legally protected characteristics and celebrates the diversity of its growing team. We are unable to sponsor or take over sponsorship of employment Visas at this time. Recruitment agencies and consultants may not submit resumes/CVs through this website or directly to managers. Halborn does not accept unsolicited agency resumes, and will not pay fees to any third-party agency or company that does not have a signed agreement with Halborn Inc. Responsibilities Conduct realistic adversary simulations from conception through reporting. Perform testing on systems, applications, networks, and processes. Research cutting-edge offensive security techniques. Develop tools and exploits. Communicate clearly and effectively, both written and orally, regarding risks and required remediations. Work collaboratively and independently on unique or specialized assignments requiring specific knowledge or experience. Comply with Company, Division, and Professional ethical standards. Qualifications A passion for the blockchain industry. 3+ years of experience in application development in Golang and C++ (both are mandatory) (blockchain or smart contract development experience is a plus). 2+ years of offensive security experience. Experience in WASM/BPF is a plus. Understanding of system administration and network administration. Experience using common penetration testing tools (BurpSuite, Metasploit, etc.). Practical reverse engineering and fuzzing experience is a plus. Proficient in at least one scripting language. Proficiency with common server and workstation operating systems. Proficient in testing modern web application languages and frameworks. Proficient knowledge of blockchain and smart contract implementations. Deep understanding of Golang-based smart contract runtimes. Ability to think critically and identify areas of technical and non-technical risk. Ability to write technical reports and communicate technical content to non-technical audiences. Experience in security research, including vulnerability discovery and exploit development. Bonus Points Experience working with Bitcoin or its forks (Bitcoin Cash, etc.). Experience working with Ethereum clients. Experience with Cosmos SDK and solid understanding of Tendermint. Experience with IBC (Inter-Blockchain Communication). Experience working with consensus protocols. Basic knowledge of cryptographic primitives such as public/private keys, hash functions, and Merkle trees (understanding how to use them, not implement them). Relevant security certifications are a plus but not required (OSCP, OSCE, GPEN, GWAPT, LPT, CISSP).
A leading cybersecurity firm is seeking an Offensive Security Engineer to conduct adversary simulations and develop offensive security techniques. Candidates should have over 5 years of experience in this field, particularly within the cryptocurrency sector, and must possess a strong understanding of smart contract audits. The role is 100% remote, offering flexibility to top talent in the blockchain space. Ideal applicants have expertise in various penetration testing tools and strong communication skills to articulate risks effectively.
03/02/2026
Full time
A leading cybersecurity firm is seeking an Offensive Security Engineer to conduct adversary simulations and develop offensive security techniques. Candidates should have over 5 years of experience in this field, particularly within the cryptocurrency sector, and must possess a strong understanding of smart contract audits. The role is 100% remote, offering flexibility to top talent in the blockchain space. Ideal applicants have expertise in various penetration testing tools and strong communication skills to articulate risks effectively.