Top Cybersecurity Jobs in Lisbon

Design, implement, and maintain distributed software systems supporting Cloudflare’s application security products, including Rate Limiting and Web Application Firewall. Participate across the software development lifecycle, write automated tests, monitor production deployments, debug complex systems, review code, collaborate with security and infrastructure teams, and mentor colleagues. The role involves Rust and Go development, databases, Docker, Kubernetes, and maintaining reliable, fault-tolerant systems at scale, with possible on-call responsibilities.

Provide premium technical support to sophisticated customers experiencing network and application attacks. Analyze traffic signatures, packet captures, protocols, and malicious activity across OSI Layers 3, 4, and 7. Advise on and apply DDoS, firewall, WAF, rate-limiting, blocklisting, and allowlisting mitigations using Cloudflare products. Troubleshoot networking, DNS, SSL/TLS, HTTP, BGP, and GRE issues while collaborating with Engineering, Operations, and Product teams to improve security tools.

Evaluate and improve application security architecture, processes, tools, and documentation. Conduct security design reviews, code reviews, threat modeling, and security testing for applications, AI systems, LLM applications, and AI agents. Identify vulnerabilities and architecture gaps, collaborate with development and product teams on remediation, implement security best practices, and assist with security incident response.

Design, build, and operate security integrations and detections (WAF, RASP, API security, IAST, SCA) across Datadog tracing libraries (.NET/Java focus). Take features from prototype to production, monitor telemetry, debug cross-system issues, shape roadmap, collaborate with product and platform teams, and mentor peers to improve code quality and adoption.

Own a financial product vertical end to end, including strategy, metrics, roadmap, technical design, delivery, and launch. Partner with engineering on APIs, data flows, ledgering, reconciliation, reliability, security, and scalability. Embed regulatory requirements across KYC, transaction monitoring, limits, privacy, and licensing. Apply AI and LLMs with evaluation, safeguards, human oversight, and failure handling while coordinating Engineering, Design, Compliance, Operations, Treasury, and Finance.

Own technical direction and execution for major products and systems. Design scalable, reliable architectures across backend, frontend, APIs, databases, and infrastructure; write production code; lead architecture decisions; resolve complex engineering problems; improve testing, security, observability, and development practices; and mentor engineers across teams.

Owns technical direction and hands-on execution for major products and engineering initiatives. Designs scalable systems across backend, frontend, APIs, databases, and infrastructure; writes code; leads architecture decisions; resolves production issues; improves engineering quality; and mentors engineers across teams. The role requires translating ambiguous product needs into technical plans and delivering complex systems from design through production in a globally distributed environment.

Lead and scale a global, AI-native Solutions Engineering organisation (~15 people). Set strategy, build playbooks for mid-market and enterprise motions, enable partners, coach leaders, influence product and GTM, and ensure repeatable, production-ready technical outcomes for complex enterprise customers.

Lead and scale strategic partner motions (channels, GSIs, ISVs, OEMs, cloud, silicon) to drive joint go-to-market plans, revenue, and market expansion. Build executive relationships, enable partners technically and commercially, establish pipeline governance, and coordinate product, sales, marketing, and engineering to convert partner potential into measurable customer impact.

Serve as a senior network security domain authority to define network engineer personas and workflows, advise product and AI teams, validate agent behaviors across firewall, cloud/SASE, policy management, compliance, vulnerability management, and troubleshooting, and help build realistic enterprise test scenarios.

Lead design and development of low-level Linux instrumentation and runtime security technologies (eBPF) to detect threats and protect cloud-native workloads. Build reusable monitoring for process, file, and network visibility, drive end-to-end feature delivery, establish testing methodologies for reliability and performance, partner cross-functionally, and provide technical leadership and mentoring.

Lead architecture and evolution of large-scale Kubernetes-based platforms. Translate business needs into scalable HLD/LLD solutions, set cloud-native best practices, guide engineering teams, support implementation and production troubleshooting, and improve platform capabilities across CI/CD, observability, and security.

Lead end-to-end IT infrastructure projects using Waterfall: plan, monitor, report, coordinate technical teams and suppliers, manage risks, budgets and governance, ensure quality delivery and successful project closure while supporting reporting and stakeholder decision-making.

Lead security across applications, services, infrastructure, and developer workflows. Identify, assess, and mitigate risks; run secure code reviews, threat modeling, and architecture discussions; build automation and tooling to prevent issues; harden authentication and access control; investigate incidents and manage disclosures; partner with engineering teams to design secure-by-default APIs and deployments.

Design and execute manual and automated testing for web applications, APIs, and backend services. Build regression, smoke, and critical-path automation suites; validate functional, integration, end-to-end, and non-functional requirements; identify and track defects; verify fixes; and collaborate with engineering, product, and DevOps teams. Use AI-assisted tools for test generation, flaky-test triage, and log analysis while improving QA processes, tooling, coverage, and release quality.

Design, build, operate, and support resilient distributed platform services. Write maintainable code, troubleshoot production issues, improve reliability and observability, and assist internal teams. Participate in on-call rotations and collaborate on platform evolution.

Design, build, and operate distributed, high-volume transactional backend services in Go. Own scope, architecture, correctness guarantees, production behavior, observability, and automated verification. Collaborate across product, infra, and QA while using agent-driven engineering practices.

Lead Constructor's end-to-end security program: manage compliance (SOC 2, ISO 27001), incident response, risk and access governance, vendor security, DLP, AI governance, security exercises, and customer-facing security communications while partnering with platform engineering on cloud and container security.

The Lead Golang Software Engineer develops server solutions, leads technical designs and code reviews, mentors colleagues, and ensures the quality of engineering practices in the Commercial Systems unit.

The Enterprise Customer Success Manager enhances customer experience by onboarding clients, managing relationships, and identifying growth opportunities, especially in IT solutions and cloud technology.

Build and maintain security controls across on-premise, multi-cloud, and SaaS environments. Manage SIEM, EDR, logging, monitoring, alerting, and threat-intelligence tooling. Develop detection rules and automated response playbooks, support vulnerability remediation, contribute to threat modeling and architecture reviews, and integrate security into the SDLC. Collaborate with engineering, DevOps, and QA teams while evaluating new security tools and techniques.

Owns ICEYE Portugal’s facility, personnel, information, and supply-chain security programs. Coordinates national and NATO clearance processes, classified-material handling, physical security controls, audits, onboarding and offboarding, incident response, vendor vetting, annual training, and security interfaces with Portuguese and NATO authorities. Partners with company leadership and IT to implement secure-area and cyber controls while maintaining compliance with Portuguese national requirements and global security standards.

Build and own AI/LLM-assisted product features in Ruby on Rails: integrate LLM APIs, implement prompts and retrieval patterns, ensure reliability, security, and performance, write automated tests, debug production issues, and improve system behavior over time.

Design, implement, and support OT security architectures; perform OT/ICS security projects, audits and assessments; secure IT/OT communications; advise on ICS/SCADA systems and industrial networks; produce documentation, policies, segmentation strategies and architecture reviews; support pre-sales and collaborate with Iberia cybersecurity teams.

Operate and administer security solutions (SIEM, firewalls, proxies, antivirus, EDR); support IT users; monitor security health and report deviations; recommend improvements to security operations and posture; perform network, endpoint, Windows and Linux administration; report to the IT Security team in Lausanne.