Testing & Automation

• Build and maintain product-level test harnesses, fuzzing/property tests and CI checks to prevent regressions for business-critical flows.

Incident Response Support

• Provide product-level Incident Response expertise like test forensic runbooks, support reproduction of payment/settlement incidents, and advise on containment/remediation whenever needed.

Metrics & Risk Visibility

• Define and own the Product Security metrics (e.g., MTTR for critical vulnerabilities, security debt burn-down, and defect density). You will translate these KPIs into high-level risk reports for the Head of Security and Engineering leadership to drive data-backed resourcing decisions.

People & Process

• Coach junior product security engineers and security champions. You will assist the Product Security Lead to define hiring standards and capability plans.

WHAT YOU WILL NEED

Must-Haves

• 4+ years total security engineering experience with at least 3+ years focused specially in application/product security or equivalent.
• Experience with Web, Mobile, Cloud, Infrastructure Pentests and Red Teaming (e.g., phishing)
• Proven track record of shipping security automation using CodeQL/GHAS, Snyk, or similar. You should be intimately familiar with the SARIF ecosystem and ASPM workflows.
• Expert-level ability to audit and propose fixes in Kotlin/Java, TypeScript/JS, Python, and familiarity with containerised deployments (Kubernetes).
• Strong threat modeling experience and pragmatic architecture guidance for high-stakes financial flows (AuthN/AuthZ, Cryptography, Payments).
• Experience building CI checks, test harnesses and lightweight fuzzing/property tests.
• Excellent stakeholder skills — able to negotiate remediation with Engineering Directors and Product owners, balancing security requirements with business velocity.

Nice-to-haves

• Prior fintech/Trading/OTC product security experience or familiarity with custody/signing patterns.
• Practical experience designing or deploying AI-assisted security tooling, leveraging LLMs for automated software patch generation, or evaluating vulnerability detection agents within enterprise developer pipelines.
• Prior experience operating alongside GRC frameworks, authoring developer-facing security policies from scratch, and building automated policy-as-code gateway integrations.
• Public track record of CVEs, security research, or open-source contributions to security tooling.
• Advanced credentials such as OSCP, OSWE, CISSP or equivalent.
• Experience with on-chain/off-chain integration, payment reconciliation, or smart contract security.
• Familiarity with vulnerability management platforms (DefectDojo, Dependabot orchestration) and GRC/Gateway integrations.
• Prior contributions to security automation and developer tooling (open source or internal).

COMPENSATION & PERKS

• Full-time salary based on experience and meaningful equity in an industry-leading company
• This is a role based in our London office, with a mandatory in-office presence four days per week.
• Work from Anywhere Policy: You can work remotely from anywhere in the world for up to 20 days per year.
• ClassPass
• Unlimited vacation policy; work hard and take time when you need it
• Apple equipment
• The opportunity to be a key player and build your career at a rapidly expanding, global technology company in an emerging field
• Flexible work culture

Blockchain is committed to diversity and inclusion in the workplace and is proud to be an equal opportunity employer. We prohibit discrimination and harassment of any kind based on race, religion, color, national origin, gender, gender expression, sex, sexual orientation, age, marital status, veteran status, disability status or any other characteristic protected by law. This policy applies to all employment practices within our organization, including hiring, recruiting, promotion, termination, layoff, recall, leave of absence, and apprenticeship. Blockchain makes hiring decisions based solely on qualifications, merit, and business needs at the time.

You may contact our Data Protection Officer by email at dpo@blockchain.com. Your personal data will be processed for the purposes of managing Controller’s recruitment related activities, which include setting up and conducting interviews and tests for applicants, evaluating and assessing the results thereto, and as is otherwise needed in the recruitment and hiring processes. Such processing is legally permissible under Art. 6(1)(f) of Regulation (EU) 2016/679 (General Data Protection Regulation) as necessary for the purposes of the legitimate interests pursued by the Controller, which are the solicitation, evaluation, and selection of applicants for employment.

Your personal data will be shared with Greenhouse Software, Inc., a cloud services provider located in the United States of America and engaged by Controller to help manage its recruitment and hiring process on Controller’s behalf. Accordingly, if you are located outside of the United States, your personal data will be transferred to the United States once you submit it through this site. Because the European Union Commission has determined that United States data privacy laws do not ensure an adequate level of protection for personal data collected from EU data subjects, the transfer will be subject to appropriate additional safeguards under the standard contractual clauses.

Your personal data will be retained by Controller as long as Controller determines it is necessary to evaluate your application for employment. Under the GDPR, you have the right to request access to your personal data, to request that your personal data be rectified or erased, and to request that processing of your personal data be restricted. You also have the right to data portability. In addition, you may lodge a complaint with an EU supervisory authority.