Senior Security & Compliance Engineer

UpstreamGerakas, Attica, Greece

On-site Full-time

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Experience Level

Senior

Qualifications

Requirements:Networking & Infrastructure: Extensive knowledge of TCP/IP and a thorough understanding of the core Linux network stack. Security Testing Methodologies: Expert in critical security disciplines including Network Traffic and Protocol Analysis, comprehensive Vulnerability Assessment and Scanning methodologies, network service enumeration, and proficient in Web Application Penetration Testing techniques.

About the job

About Us

Leading the charge in mobile technology, we empower 1.2 billion consumers with innovative solutions. In a rapidly evolving digital landscape, we enable businesses to enhance their digital capabilities and optimize user experiences. Our cutting-edge performance marketing strategies, developed by skilled marketers and engineers, create unparalleled digital journeys across various channels. We proudly partner with industry giants in Telecom, Insurance, Education, FMCGs, and Retail across 45+ countries in Latin America, Africa, the Middle East, and Southeast Asia.

Position Overview:

We are on the lookout for a Senior Security & Compliance Engineer who will bring specialized security expertise, skills, and best practices to our talented engineering teams. The ideal candidate is a dedicated engineer passionate about resolving complex security challenges while delivering robust engineering solutions. This position entails acting as a technical leader for projects and technologies, serving as a crucial resource within the company, and thriving in dynamic, production-facing environments.

Key Responsibilities:

Monitor and respond to security events, managing escalations and acting as a liaison during security incidents.
Act as a dedicated security analyst for critical projects.
Lead the vulnerability management lifecycle, overseeing installation and patching efforts.
Conduct specialized security tasks, including security audits, penetration testing (CHECK, CREST, CEH, TIGER), evidence collection, and forensic analysis.
Drive and manage technical tasks, ensuring completion within time and technological constraints.
Contribute to end-user security education and awareness initiatives.
Maintain and update compliance posture, ensuring security policies and standards are current and effective.
Serve as the primary technical resource for security-related client discussions, effectively communicating technical concepts to diverse audiences.
Provide essential security content and review for commercial engagements, including RFPs, bids, and client assurances.

About Upstream

At Upstream, we lead the mobile technology sector, providing groundbreaking solutions that drive engagement and growth for businesses worldwide. We are committed to innovation and excellence in enhancing digital experiences across multiple industries.

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Senior Application Security Engineer

Infiterra

Full-time|Remote|Greece (Remote)

About InfiterraJoin us in revolutionizing the subscription economy by streamlining the delivery of subscription services.Infiterra empowers IT distributors, Managed Service Providers (MSPs), and telecommunications companies to thrive in the subscription landscape. Our cutting-edge subscription commerce platform automates and integrates subscription workflows—from quote to billing—enhancing operational efficiency, ensuring billing accuracy, and enabling scalable growth.As a recognized global frontrunner in subscription commerce, Infiterra melds innovation, performance excellence, and trusted expertise to assist our partners in their transformation and growth journeys.About the RoleWe are seeking a proactive Senior Application Security Engineer who will embed security into our software design, development, and operational processes—not as an afterthought, but as an integral part of our daily engineering practices. You will engage directly with product and engineering teams to identify risks early, enhance secure-by-design methodologies, and consistently elevate our application security standards. This role is highly practical, closely interfacing with code and architecture, and deeply integrated into the Software Development Life Cycle (SDLC).Your ResponsibilitiesIntegrate security within the SDLCIncorporate security measures across all SDLC phases: requirements gathering, design, implementation, testing, deployment, and maintenance.Collaborate closely with engineering teams to ensure adherence to secure development practices.Evaluate security controls for new features, services, and architectural modifications.Threat Modeling and Secure DesignFacilitate threat modeling sessions (e.g., STRIDE) for both new and existing systems.Identify potential threats, attack vectors, misconfigurations, and insecure design patterns.Work alongside engineers to ensure systems adhere to secure-by-design principles.Secure Code and Architecture ReviewsConduct security-focused code reviews to pinpoint vulnerabilities and risky implementations.Offer clear and actionable guidance on secure coding patterns and best practices.Assess application and system architectures from a security standpoint.Security Testing and Tooling

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Intracom Defense

Full-time|On-site|Koropi, Attica, Greece

Become a Crucial Part of Our Team as a Mechanical Application Engineer at Intracom Defense (IDE)About UsAt Intracom Defense (IDE), we pride ourselves on being Greece's leading technology defense company.Our mission is to innovate, create, and deliver state-of-the-art technology on a global scale.We specialize in researching, designing, developing, and manufacturing pioneering products and solutions across various sectors, including Tactical Communication, Information Systems, Missile Electronics, Surveillance Solutions, Hybrid Electric Power Systems, Next-gen Unmanned Aerial and Marine Platforms, and disruptive technologies such as Artificial Intelligence and Cyber Security.As a recognized key player in the international defense arena, IDE is a registered NATO supplier and actively engages in global development and production initiatives, as well as industrial cooperation programs in the defense sector.Moreover, we are a trusted leader in EU research and development initiatives, where our commitment to research and innovation drives future technological advancements.At IDE, we believe in investing in our people and technology!We’re not just focused on defense— we’re dedicated to shaping the future! Location: Koropi, [East] Suburbs Working Model: On-site Growth Opportunities: Continuous learning, professional development, and clear career advancement pathways Reporting to: Mechanical Engineering Section Manager of the Engineering & Systems DepartmentWhy You Should Join Us:We are seeking a Mechanical Application Engineer who is not only exceptionally skilled but also possesses a business-oriented mindset to meet customer needs, along with a strong drive for innovation. If you are ready to take charge and lead advancements, IDE is the perfect fit for you.Your Responsibilities:Engage in the mechanical design, development, and integration of cutting-edge defense products.Contribute to the development of Defense Hybrid Power Systems, focusing on Diesel Generator Sets, encompassing the entire development cycle from system requirements specification, design, analysis, technical data package, prototype development, integration, testing, installation, field trials, safety compliance, and manufacturing processes.What We Offer:A friendly and dynamic working environment.Competitive remuneration directly based on qualifications and experience.Opportunities for continuous learning and career development.Private health insurance.Corporate transportation from the metro station.

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Full-time|On-site|Marousi, Attica, Greece

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Full-time|On-site|Athens, Attica, Greece

Uni Systems is seeking an Incident Response Security Engineer to join the UniQue Security Engineering Services division in Athens, Attica, Greece. This position plays a key part in protecting clients' critical assets by responding to security incidents and designing effective security solutions. Role overview As a member of the Incident Response Team, you will participate in a weekly on-call rotation. During these periods, the role involves triaging incidents, evaluating security threats, and taking direct action if the incident matches your expertise. When needed, you will escalate issues to specialized teams such as System/Cloud or Network engineers. What you will do Participate in a weekly standby rotation, managing incident triage and response or escalation as appropriate. Design, implement, and operate cybersecurity solutions to protect client assets. Provide technical consultation and guidance on cybersecurity best practices. Collaborate with clients to analyze requirements and assess existing infrastructure, developing tailored security solutions. Deploy security solutions, ensuring smooth integration and minimal disruption. Create and maintain technical documentation, security policies, and procedures. Estimate project effort and support presales activities by contributing to technical proposals. Lead training sessions and knowledge transfer for clients and internal teams. Collaboration This role works closely with cross-functional teams to ensure that security solutions meet client needs and align with industry standards. Regular interaction with clients is expected, both for technical consultation and for delivering training.

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Senior Application Support Engineer at INTRALOT | Athens, Greece

Intralot, Inc.

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Nov 26, 2025

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Senior Application Support Engineer at INTRALOT | Athens, Greece

INTRALOT

Full-time|On-site|Athens, Attikí, Greece

Elevate Your Career with INTRALOT as a Senior Application Support EngineerRole Overview:As a Senior Application Support Engineer, you will be instrumental in maintaining the reliability and seamless functionality of our applications. Your expertise will be crucial in addressing intricate production challenges, driving system enhancements, and guiding junior team members.Diagnosing and resolving production incidents at the 2nd level, adhering to agreed Service Level Agreements (SLAs).Conducting root cause analysis (RCA) to pinpoint and alleviate recurring issues.Improving and refining existing monitoring and alerting systems, utilizing tools such as Nagios, Grafana, and NewRelic.Collaborating with cross-functional teams (Development, DevOps, and QA) to enhance system stability.Simulating incidents in test environments and confirming fixes prior to deployment.Managing problem tracking and resolution, ensuring ongoing service improvement.Providing mentorship and technical support to junior team members.

Nov 26, 2025

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Cyber Security Engineer (Fluent in English)

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Full-time|On-site|Athens, Attica, Greece

Join our dynamic team as a Cyber Security Engineer at European Dynamics, where you will play a critical role in enhancing our Information Security capabilities. We are looking for an individual who possesses deep expertise in the deployment and configuration of cutting-edge security tools and methodologies. Your primary responsibilities will include utilizing advanced technologies to fortify our security posture, conducting AI-driven penetration testing, managing Cyber Threat Intelligence (CTI) sharing platforms, overseeing Security Information and Event Management (SIEM) and Intrusion Detection Systems (IDS/IPS), orchestrating incident response with Next-Generation Security Orchestration, Automation and Response (NG-SOAR) systems, and participating in simulation training on cyber-range platforms. Fluency in English is essential, as you will serve as a technical expert in Athens, Greece. The ideal candidate will thrive in a collaborative environment, demonstrating responsiveness, integrity, reliability, along with strong analytical, problem-solving, and organizational skills. You will be an integral part of projects funded by the European Commission and national research initiatives, where initiative, adaptability, and a strong sense of responsibility are highly valued.Key Responsibilities:Design, deploy, and manage frameworks for AI-based penetration testing to proactively identify and address vulnerabilities.Configure and optimize CTI sharing platforms, including MISP and OpenCTI, ensuring timely threat intelligence dissemination.Implement NG-SIEM solutions using tools such as the ELK stack, Graylog, Wazuh, Grafana, Velociraptor, and InfluxDB/Telegraf.Deploy and fine-tune NG-SOAR platforms, including Shuffle, Wazuh, TheHIVE, Cortex, and IRIS, to enhance incident response activities.Maintain behavioral IDS/IPS systems like Snort, Suricata, and SecurityOnion to detect and prevent malicious threats.Keep abreast of the latest security trends and practices, including CACAO Standards (STIX 2.1, TAXII) for threat intelligence sharing.Contribute to technical documentation for security protocols and systems.Work collaboratively with multidisciplinary teams to ensure effective security operations and incident management.

Feb 2, 2026

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Senior Security Engineer at Kiefer Tech | Athens

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Full-time|On-site|Athens

Join Kiefer Tech as a Senior Security Engineer, the first dedicated security hire on the Sophea platform. In this pivotal role, you will integrate security as a fundamental engineering capability, enhancing cloud infrastructure, securing AI attack surfaces, and embedding automated security practices throughout the development lifecycle. Your expertise will enable fast and confident deployments, steering clear of compliance and policy writing.Key Responsibilities:Perform comprehensive security assessments and create a prioritized remediation roadmap for infrastructure and services.Enhance security in AWS and Kubernetes environments, focusing on IAM, network policies, workload isolation, and secrets management.Secure AI-specific attack surfaces by implementing defenses against prompt injection, handling PII in LLM pipelines, and preventing data leakage.Integrate automated security measures into CI/CD processes, including dependency scanning, container image scanning, code analysis, and secrets detection.Design secure-by-default communication patterns for services, authentication processes, and data management.Develop incident response capabilities, including detection, alerting, response workflows, and post-incident reviews.Collaborate with engineering teams to enhance the security posture while ensuring smooth operations.

Feb 26, 2026

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Senior Security & Compliance Engineer

Upstream

Full-time|On-site|Gerakas, Attica, Greece

About UsLeading the charge in mobile technology, we empower 1.2 billion consumers with innovative solutions. In a rapidly evolving digital landscape, we enable businesses to enhance their digital capabilities and optimize user experiences. Our cutting-edge performance marketing strategies, developed by skilled marketers and engineers, create unparalleled digital journeys across various channels. We proudly partner with industry giants in Telecom, Insurance, Education, FMCGs, and Retail across 45+ countries in Latin America, Africa, the Middle East, and Southeast Asia.Position Overview:We are on the lookout for a Senior Security & Compliance Engineer who will bring specialized security expertise, skills, and best practices to our talented engineering teams. The ideal candidate is a dedicated engineer passionate about resolving complex security challenges while delivering robust engineering solutions. This position entails acting as a technical leader for projects and technologies, serving as a crucial resource within the company, and thriving in dynamic, production-facing environments.Key Responsibilities:Monitor and respond to security events, managing escalations and acting as a liaison during security incidents.Act as a dedicated security analyst for critical projects.Lead the vulnerability management lifecycle, overseeing installation and patching efforts.Conduct specialized security tasks, including security audits, penetration testing (CHECK, CREST, CEH, TIGER), evidence collection, and forensic analysis.Drive and manage technical tasks, ensuring completion within time and technological constraints.Contribute to end-user security education and awareness initiatives.Maintain and update compliance posture, ensuring security policies and standards are current and effective.Serve as the primary technical resource for security-related client discussions, effectively communicating technical concepts to diverse audiences.Provide essential security content and review for commercial engagements, including RFPs, bids, and client assurances.

Oct 10, 2025

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Software Engineer - Client-Facing Applications

Blueground

Full-time|On-site|Athens, Attica, Greece

Redefining how people liveAt Blueground, we believe that when your foundation is reliable, the world becomes your oyster. We are pioneering the leading platform for modern living.Every year, over 350 million individuals relocate between cities — yet contemporary housing solutions have not kept pace with the evolving needs of a mobile generation. Blueground was established to transform that experience.With more than 40,000 homes worldwide, available for stays ranging from a few days to a year or longer, we are just getting started on an ambitious journey to redefine living and create an entirely new category. Our competitive advantage lies in our robust proprietary technology, operational excellence, and a team that operates with agility and precision.Our Culture Is Anchored In Five Principles Guests First – Every decision prioritizes their experience. Move Fast – We value momentum and decisive action. Dive In – The magic resides in the details, and we delve deep. Embrace Change – Change is not disruption; it’s our pathway to growth. Keep It Honest – Transparency accelerates progress and strengthens bonds.If you are prepared to do the most impactful work of your career and contribute to reshaping global living standards, we would be thrilled to meet you. About the RoleWe are on the lookout for a Software Engineer to join our Client-Facing Mobile Team, tasked with building the backend systems that support our guest mobile app, which is relied upon by guests throughout their stay. We take guest experience seriously, and the app is pivotal in ensuring that every stay is seamless, covering everything from booking and apartment access to support, maintenance, and personalized services. You will develop scalable backend services using Kotlin and Node.js, design APIs that facilitate real-time mobile interactions, and help shape a platform utilized daily by thousands of guests. We actively incorporate AI into our development processes, leveraging modern AI-assisted tools to maintain agility, foster curiosity, and deliver an enjoyable user experience.Our Tech StackKotlin | Node.jsPostgres | MongoDB | Redis | SnowflakeApache KafkaRest | GraphQLJUnit 5 / SpockAWS | Kubernetes | ArgoCD | Argo WorkflowsCursor, Claude Code, Opencode.ai, Github CopilotOur code resides on GitHub, built, tested, and packaged through GitHub Actions, and operates on Kubernetes. We manage projects in JIRA, design prototypes and mockups in Figma, and monitor our systems and performance using Datadog, assisted by Resolve.ai.What You'll Be DoingDevelop services that support our customer-facing web and mobile applicationsPrimarily focus on backend development while maintaining a full-stack perspective.Utilize AI tools extensively in your workflow...

Feb 17, 2026

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