Senior Software Engineer, KPI & Cryptographic Systems

Requirements. You do not need to be a cryptographer, but you need to reason precisely about certificate profiles, key parameters, and issuance policy. Familiarity with HSMs. PKCS#11 integration, key ceremonies, key-attestation flows, and understanding of what FIPS 140-2/3 validation actually means in production. Strong systems programming background in at least one of Go, Rust, or C/C++. Distributed systems fluency — you have built or operated globally replicated, availability-critical services with strict correctness guarantees. Experience designing and operating database schemas for high-integrity systems (Postgres or equivalent). Security-hardened system design instincts — threat modelling, defence in depth, least privilege, and secure key handling. Comfort with high-consequence work. A mis-issued or mis-revoked certificate is a public, industry-visible event. You need the temperament to move quickly and the discipline to be careful. Bonus Points Direct experience working on or with a publicly-trusted or private CA, or a large-scale internal PKI (Let’s Encrypt / Boulder, Google Trust Services, DigiCert, Sectigo, ISRG, Entrust, Microsoft PKI, HashiCorp Vault PKI, step-ca, CFSSL, or an internal CA at scale). Experience with crypto/x509 , BoringSSL, OpenSSL/AWS-LC, CFSSL, or an equivalent PKI codebase. Experience with WebTrust for CAs / WebTrust BR / WebTrust Network Security audit engagements. Familiarity with post-quantum cryptography — ML-DSA, ML-KEM, hybrid signature schemes, and the current state of PQ signature standardisation. Familiarity with emerging browser trust-establishment proposals (e.g. Merkle Tree Certificates). Prior participation in the CA/Browser Forum, IETF LAMPS / TLS / PLANTS / PQUIP working groups, the transparency.dev community, or a browser root program review. Experience running or automating offline key ceremonies. Experience operating Certificate Transparency log infrastructure or CT monitoring at scale. Familiarity with formal methods, differential fuzzing, or property-based testing for cryptographic protocol code. Kubernetes experience. Compensation For Portugal based hires: Estimated annual salary is between €66,000 - €83,000. Equity This role is eligible to participate in Cloudflare's equity plan. Benefits Cloudflare offers a complete package of benefits and programs to support you and your family. Our benefits programs can help you pay health care expenses, support caregiving, build capital for the future and make life a little easier and fun! The below is a description of our benefits for employees in the United States, and benefits may vary for employees based outside the U.S. Health & Welfare Benefits Medical/Rx Insurance Dental Insurance Vision Insurance Flexible Spending Accounts Commuter Spending Accounts Fertility & Family Forming Benefits On-demand mental health support and Employee Assistance Program Global Travel Medical Insurance Financial Benefits Short and Long Term Disability Insurance Life & Accident Insurance 401(k) Retirement Savings Plan Employee Stock Participation Plan Time Off Flexible paid time off covering vacation and sick leave Leave programs, including parental, pregnancy health, medical, and bereavement leave What Makes Cloudflare Special? We’re not just a highly ambitious, large-scale technology company. We’re a highly ambitious, large-scale technology company with a soul. Fundamental to our mission to help build a better Internet is protecting the free and open Internet. Project Galileo : Since 2014, we've equipped more than 2,400 journalism and civil society organizations in 111 countries with powerful tools to defend themselves against attacks that would otherwise censor their work, technology already used by Cloudflare’s enterprise customers--at no cost. Athenian Project : In 2017, we created the Athenian Project to ensure that state and local governments have the highest level of protection and reliability for free, so that their constituents have access to election information and voter registration. Since the project, we've provided services to more than 425 local government election websites in 33 states. 1.1.1.1 : We released 1.1.1.1 to help fix the foundation of the Internet by building a faster, more secure and privacy-centric public DNS resolver. This is available publicly for everyone to use - it is the first consumer-focused service Cloudflare has ever released. Here’s the deal - we don’t store client IP addresses never, ever. We will continue to abide by our privacy commitment and ensure that no user data is sold to advertisers or used to target consumers. Sound like something you’d like to be a part of? We’d love to hear from you! Please note that applicants who progress to the offer stage of the interview process may be asked to attend an in-person interview within one of the Cloudflare Offices or Cloudflare Hubs. More details about this will be available at that stage of the interview process. This position may require access to information protected under U.S. export control laws, including the U.S. Export Administration Regulations. Please note that any offer of employment may be conditioned on your authorization to receive software or technology controlled under these U.S. export laws without sponsorship for an export license. Cloudflare is proud to be an equal opportunity employer. We are committed to providing equal employment opportunity for all people and place great value in both diversity and inclusiveness. All qualified applicants will be considered for employment without regard to their, or any other person's, perceived or actual race, color, religion, sex, gender, gender identity, gender expression, sexual orientation, national origin, ancestry, citizenship, age, physical or mental disability, medical condition, family care status, or any other basis protected by law. We are an AA/Veterans/Disabled Employer. Cloudflare provides reasonable accommodations to qualified individuals with disabilit