[Skip to main content](#main-content) [ OpenNash ](https://opennash.com/) / [Jobs](https://jobs.opennash.com/) [ 01 Search jobs](https://jobs.opennash.com/search/)[ 02 Companies](https://jobs.opennash.com/explore/)[ 03 Hiring report](https://jobs.opennash.com/reports/hiring/)[ 04 AI assistants](https://jobs.opennash.com/connect/)[ 05 How it works](https://jobs.opennash.com/methodology/) Citigroup · Singapore Singapore # Senior Offensive Security Penetration Tester - Crypto and Digital Assets, Senior Vice President Singapore Singapore Full-time Executive Security Listed on Citigroup’s official careers site. Posted November 6, 2026. Check that it is still open and apply there. [Apply on Citigroup’s careers site →](https://citi.wd5.myworkdayjobs.com/2/job/Singapore--Singapore/Senior-Offensive-Security-Penetration-Tester---Crypto-and-Digital-Assets--Senior-Vice-President_261007782) [OpenNash Jobs](https://jobs.opennash.com/) / [Citigroup](https://jobs.opennash.com/companies/citigroup/) / Senior Offensive Security Penetration Tester - Crypto and Digital Assets, Senior Vice President ## Job description Are you interested in growing your career in Cyber Security? Whether you are an application developer or researcher looking to make the switch into the challenging, yet rewarding, world of information security, or you are an elite white-hat hacker, Citi is the place for you. Our team of world class, talented individuals, who are passionate about security, put their skills to the test every day on a global scale. At Citi, you will be exposed to all sorts of technologies on an enterprise-scale, so hunger for knowledge and research is greatly appreciated and rewarded. Technology is constantly evolving, and Citi is evolving with it by adopting the latest application frameworks, migrating to cloud-based technologies, and implementing Artificial Intelligence in numerous workflows across the enterprise. Citi’s application penetration testing team is at the forefront of testing and securing each of these solutions and you can make an impact on the next technology to be released. This team specializes in conducting various types of penetration testing engagements (full end-to-end white-box and/or grey-box testing) against a variety of Citi owned or 3rd party SaaS applications (Web, Mobile, Thick Client, and APIs) leveraging a wide array of technologies from Artificial Intelligence, to Digital Assets, Blockchain, and more traditional application development frameworks. The primary goal would be to secure Citi, its customers, and clients by manually identifying, researching, validating, and exploiting application security weaknesses and misconfigurations. Core responsibilities include: Plan, scope, and execute comprehensive penetration tests against blockchain networks, smart contracts, decentralized finance (DeFi) protocols, and digital asset custody systems. Perform manual and automated source code reviews of smart contracts written in Solidity, Rust, Go, or Vyper to identify logic flaws, reentrancy, front-running, flash loan vulnerabilities, and integer overflows. Act as a subject matter expert in offensive information security performing dynamic and manual security assessments on web technologies such as APIs, JavaScript Frameworks, Artificial Intelligence, and Distributed Ledger Technologies. Drive remediation by outlining a defense-in-depth approach to business stakeholders and providing strategic solutions to developers on effective preventive and detective security controls. Have strong technical writing and presentation skills to report and articulate the vulnerability assessment results to any audience. Contribute to the review of internal processes and activities and assist in identifying potential opportunities for improvement and automation. Conduct research into emerging attack vectors, zero-day exploits, and novel vulnerabilities unique to Web3 and digital asset ecosystems Must have or be willing to obtain Industry-accredited security certifications such as: BSCP, GWAPT, GPEN, OSCP, OSWE, CISSP, or other related certifications. ### Who we are looking for Background in both software development and security, with hands-on experience in blockchain, digital assets, and smart contracts. Strong understanding of cryptographic concepts, including symmetric encryption, asymmetric encryption, hashing, and digital signatures. Experience developing custom security scripts for offensive security tooling and/or CI/CD security automation to shift testing earlier in the Software Development Life Cycle (SDLC). Familiarity with security tools such as Slither, Mythril, Burp Suite Proxy, Postman, and other application or blockchain security testing tools. Master's Degree or PhD with 3+ years of professional or research experience in blockchain and the above technical areas, or a Bachelor's Degree with 5+ years of relevant professional experience in blockchain and the above technical areas. Passion for offensive security and ethical hacking, with an interest in securing blockchain technologies and digital assets. Join our growing team of expert ethical hackers and help secure the future of blockchain technologies and digital assets. Apply today! ------------------------------------------------------ Job Family Group: Technology ------------------------------------------------------ Job Family: Information Security ------------------------------------------------------ Time Type: Full time ------------------------------------------------------ Most Relevant Skills Please see the requirements listed above. ------------------------------------------------------ Other Relevant Skills For complementary skills, please see above and/or contact the recruiter. ------------------------------------------------------ Citi is an equal opportunity employer, and qualified candidates will receive consideration without regard to their race, color, religion, sex, sexual orientation, gender identity, national origin, disability, status as a protected veteran, or any other characteristic protected by law. If you are a person with a disability and need a reasonable accommodation to use our search tools and/or apply for a career opportunity review Accessibility at Citi. View Citi’s EEO Policy Statement and the Know Your Rights poster. ## At a glance - Posted by the employer: Nov 6, 2026 - First seen by OpenNash: Nov 10, 2026 - Last checked: Nov 10, 2026 - Listed for: 4 days - Location: Singapore Singapore - Employment type: Full-time[Apply on Citigroup’s careers site →](https://citi.wd5.myworkdayjobs.com/2/job/Singapore--Singapore/Senior-Offensive-Security-Penetration-Tester---Crypto-and-Digital-Assets--Senior-Vice-President_261007782) ## Hiring at Citigroup - Open jobs: 4,725 - New in the last 7 days: After two weekly collections - Tracked since: Jul 10, 2026 [All Citigroup jobs](https://jobs.opennash.com/companies/citigroup/) · [Weekly hiring report](/reports/hiring/) ## More jobs at Citigroup ### [Senior Penetration Tester (Cyber Security) Vice President](https://jobs.opennash.com/companies/citigroup/jobs/cb5521d068d564a5fded/) Singapore Singapore ### [Senior SOC Cyber Threat Analyst (VP / Hybrid)](https://jobs.opennash.com/companies/citigroup/jobs/c46816d16e7a1f05cb15/) Singapore Singapore ### [Senior OpenLink Endur Analyst (Vice President)](https://jobs.opennash.com/companies/citigroup/jobs/0426a8f2aa0af3db6ee8/) Singapore Singapore ### [Senior Private Banker (Thailand Team) - Citi Private Bank](https://jobs.opennash.com/companies/citigroup/jobs/14cd8dffa2e6a0819d2e/) Singapore Singapore ### [Senior Software Engineer – Ultra Low Latency Risk Engine Developer, Vice President](https://jobs.opennash.com/companies/citigroup/jobs/c2fea9c1f9b0f2118f55/) Singapore Singapore ## Similar jobs at other companies ### [Offensive Security Engineer, Penetration Testing](https://jobs.opennash.com/companies/procter-gamble/jobs/c78d9ee35d36325406f4/) Procter & Gamble · Warsaw Plant & GO ### [Offensive Security Analyst](https://jobs.opennash.com/companies/bouygues/jobs/02ec77b9f50d6a3bc3ab/) Bouygues · Romania ### [Senior Consultant, Offensive Security, Canada, Offensive Security Services](https://jobs.opennash.com/companies/alphabet/jobs/e272a84737227ae2aee8/) Alphabet · Ottawa, ON, Canada +1 more ### [Offensive Security Researcher, SEAR](https://jobs.opennash.com/companies/apple/jobs/65ddaa81ffc640d3f706/) Apple · Paris, France ### [Offensive Security Manager](https://jobs.opennash.com/companies/sp-global/jobs/d68d201446ea0e4e941d/) S&P Global · Hyderabad, Telangana [Security jobs](/functions/security/) OpenNash lists jobs from employers’ own careers sites and does not handle applications. Dates come from the employer where stated; “first seen” and “last checked” are our own observations. [ OpenNash ](https://opennash.com/) AI-native services firm that builds custom software and 24/7 AI agents. OpenNash Jobs is an OpenNash Applied AI project. [Book time with OpenNash](https://calendly.com/opennash/new-meeting?hide_gdpr_banner=1) Jobs - [Search jobs](https://jobs.opennash.com/search/) - [Companies](https://jobs.opennash.com/explore/) - [Hiring report](https://jobs.opennash.com/reports/hiring/) - [AI assistants](https://jobs.opennash.com/connect/) - [How it works](https://jobs.opennash.com/methodology/) OpenNash - [opennash.com](https://opennash.com/) - [Services](https://opennash.com/ai-agent-consulting/) - [OpenNash CX](https://opennash.com/cx/) - [AI Tools](https://opennash.com/ai-tools/) - [Blog](https://opennash.com/blog/) - [About](https://opennash.com/about/) Contact - [hello@opennash.com](mailto:hello@opennash.com) - [LinkedIn](https://www.linkedin.com/company/opennash) - [Support](https://jobs.opennash.com/support/) - [Privacy](https://jobs.opennash.com/privacy/) - [Terms](https://jobs.opennash.com/terms/) © 2026 OpenNash, Inc. Company names and public job postings belong to their respective owners. Employers control source availability and application decisions.