Senior Product Security Engineer at Blockchain.com – London | Jobyssey

You will operate the product security program for internally developed products across Consumer OTC and MRE lines. You are a senior, hands on professional who will design and run the secure development lifecycle, lead threat modeling and architecture reviews, own the security debt lifecycle, and architect automated pipelines that protect billions in transaction volume. You will translate technical findings into business prioritized remediation and raise developer capabilities so security is delivered by code and process.

Responsibilities

Act as a strategic security partner for product lines such as Consumer and OTC.
Own security gates for major feature releases and ensure security is integrated from design.
Operate and improve the secure development lifecycle including SAST SCA DAST, SARIF ingestion, PR review standards, CI/CD security automation, and vulnerability triage workflows.
Research, architect, and safely embed AI utilities and Large Language Model agents directly into the secure development lifecycle.
Lead threat modeling for sensitive flows including authentication, payments, custody, reconciliation and sign off on security architecture for critical designs.
Translate technical risks and regulatory demands into clear security policies.
Own the creation and upkeep of Application Security Standards reference architectures and secure coding baselines aligned to compliance requirements.
Oversee bug bounty triage and remediation strategy.
Perform deep dive code reviews of security sensitive pull requests, mentor on secure coding patterns, and provide remediation guidance.
Conduct deep dive code reviews on Java and Kotlin backend pull requests.
Produce data driven Security Debt packs and negotiate remediation into engineering roadmaps.
Define application runtime signals and work with SecOps to instrument logs and alerts.
Build and maintain product level test harnesses, fuzzing property tests and CI checks to prevent regressions.
Provide product level Incident Response expertise including test forensic runbooks and reproduction of payment and settlement incidents.
Define and own Product Security metrics and translate KPIs into high level risk reports for leadership to drive data backed resourcing decisions.
Coach junior product security engineers and security champions.

Requirements

4+ years total security engineering experience with at least 3+ years focused on application security.
Experience with Web, Mobile, Cloud, Infrastructure Pentests and Red Teaming (e.g., phishing).
Proven track record of shipping security automation using CodeQL Snyk or similar; familiarity with the SARIF ecosystem and ASPM workflows.
Expert level ability to audit and propose fixes in Kotlin Java TypeScript Python; 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.
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).

Benefits

Equity in the company
In office London four days per week
Work from Anywhere policy up to 20 days per year
ClassPass
Unlimited vacation (employee flexible time off)
Apple equipment

Explore more jobs

Responsibilities

Requirements

Benefits