Senior Security & Compliance Engineer
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Before you apply
LocationGerakas, Attica, Greece
Typefull-time
SenioritySenior
DepartmentEngineering
Company size51–200 people
PostedApr 1, 2026 · 7mo ago
Verified live2d ago
May no longer be actively hiring
Posted by the company on Apr 1, 202646% of this company's open roles have been listed for 90+ days
At a glanceSummarised by Seekless from the posting.
Excellent knowledge of TCP/IP
Comprehensive understanding of the core Linux network stack
Expert proficiency in Network Traffic and Protocol Analysis
Expert proficiency in Vulnerability Assessment and Scanning methodologies
Expert proficiency in network service enumeration
Expert proficiency in Web Application Penetration Testing techniques
Proven hands-on experience in developing, implementing, and auditing standardized security baselines
Proven hands-on experience in configuration management controls
Proven hands-on experience in patch management strategies across diverse OS and application platforms
Deep knowledge and hands-on experience with SIEM solutions
Deep knowledge and hands-on experience with Vulnerability Management platforms
Experience implementing and managing IPS Systems (Cisco, Checkpoint)
Experience implementing and managing Firewalls (Cisco, Checkpoint)
Proficiency with DLP and Endpoint Protection solutions
Experience with Web Application Firewalls (WAF)
Familiarity with IDAM products
Experienced in data encryption technologies and products
Knowledge of Cloud and Mobile Security Architecture
Experience in datacenter protection strategies
Demonstrable knowledge of common security standards and compliance frameworks (ISO 27001, NIST, SOC 2)
Practical experience translating technical controls into formal security policies and procedures
Proven ability to translate complex security testing results into high-quality documentation
Solid communication skills (oral and written)
Proven experience presenting technical security findings to C-level executives and external clients
Track record of meeting deadlines in challenging situations
Dependable, reliable, with strong attention to detail
Requires a flexible work style
Strong team player, capable of providing guidelines and assistance to peers
High-quality Python/shell development experience
Prior experience in a network position
Upstream is an equal-opportunity employer (diversity, non-discrimination, accommodation policy)
Skills
Python
SIEM
IPS
Firewall
DLP
Endpoint Protection
Web Application Firewall (WAF)
IDAM
Data Encryption
ISO 27001
NIST Cybersecurity Framework
SOC 2
Cloud Security
Mobile Security
Benefits
Competitive base salary and benefits
Who we are
Upstream is a global leader in mobile marketing automation and digital service innovation, enabling Mobile Network Operators (MNOs) and brands to grow revenue, improve customer engagement and succeed in the digital economy. With over two decades of experience and operations spanning 45+ markets across Africa, Latin America, Asia, Europe, and the Middle East, we are a trusted partner to more than 60 MNOs worldwide.
Headquartered in Athens, Greece, and with regional hubs in London, Dubai, Johannesburg, Lagos, São Paulo and Rio de Janeiro, Upstream combines global expertise with deep local insight. Our end-to-end approach encompasses strategy, creative development, technical deployment, campaign execution, and ongoing optimization, ensuring seamless, scalable, and performance-driven service delivery.
About the role:
Our focus centers on bringing domain-specific security knowledge, skills, and best practices to our talented network and engineering teams. We are seeking a Sr. Security & Compliance Engineer to provide added-value services, helping ensure our business remains highly available, flexible, and robust.
An ideal candidate would be a passionate engineer who is dedicated to pursuing complicated technical security problems and coming up with robust engineering solutions. This role requires someone who can exhibit a technical lead role for projects and technologies, who acts as a crucial point of reference within the company, and thrives in challenging, production-facing environments.
What you will do…
• Monitor and respond to security events, managing escalation and acting as a liaison during security incidents.
• Serve as a dedicated security analyst for critical projects.
• Lead the vulnerability management lifecycle, overseeing installation and patching efforts.
• Conduct specialized security work, including security audits, Penetration Testing (e.g., CHECK, CREST, CEH, TIGER), evidence collection, and forensics analysis.
• Drive and own technical tasks, pursuing their completion within time and technological constraints.
• Contribute to end-user security education and awareness.
• Maintain and update compliance posture, ensuring security policies and standards remain current and effective.
• Serve as a primary technical resource for security-related client discussions, articulating technical concepts to various types of audiences.
• Provide essential security content and review for commercial engagements, including RFPs, bids, and client assurances.
Requirements
• Networking & Infrastructure: Excellent knowledge of TCP/IP. Comprehensive understanding of the core Linux network stack.
• Security Testing Methodologies: Expert proficiency in essential security disciplines including Network Traffic and Protocol Analysis, comprehensive Vulnerability Assessment and Scanning methodologies, network service enumeration, and hands-on Web Application Penetration Testing techniques.
• System and Infrastructure Hardening: Proven, hands-on experience in developing, implementing, and auditing standardized security baselines, robust configuration management controls, and effective patch management strategies across diverse operating system and application platforms, including critical data services.
• Security Control Systems: Deep knowledge and hands-on experience with SIEM solutions and Vulnerability Management platforms.
⮚ Experience implementing and managing IPS Systems (Cisco, Checkpoint) and Firewalls (Cisco, Checkpoint).
⮚ Proficiency with DLP and Endpoint Protection solutions, including Application Control and Device Control.
⮚ Experience with Web Application Firewalls (WAF).
⮚ Familiarity with products for IDAM (Identity and Access Management).
• Data Protection: Experienced in data encryption technologies and products.
• Development: High-quality Python/shell development experience is considered a plus.
• Knowledge of Cloud and Mobile Security Architecture.
• Experience in datacenter protection strategies. • Security Governance: Demonstrable knowledge of common security standards and compliance frameworks (e.g., ISO 27001, NIST Cybersecurity Framework, SOC 2). Practical experience translating technical controls into formal, auditable security policies and procedures.
• Formal Documentation: Proven ability to translate complex security testing results, audits, and posture assessments into high-quality, professional, and accessible documentation suitable for internal leadership and external client assurance reviews.
• Stakeholder Communication: Solid communication skills (both oral and written), being able to explain concepts and ideas to various types of audiences, with proven experience presenting technical security findings and strategy to both C-level executives and external clients.
Additional Experience
• Knowledge of Cloud and Mobile Security Architecture and experience in datacenter protection strategies.
• Prior experience in a network position will be considered a plus.
Core Competencies
• Operational Excellence: Track record of meeting deadlines in challenging situations. Dependable, reliable, with strong attention to detail. Requires a flexible work style to ensure quality standards are met.
• Teamwork: Strong team player, capable of providing guidelines and assistance to peers
Benefits
We offer a competitive base salary and benefits, directly dependent on the candidate’s qualifications and skills. The real excitement comes from working closely with a dynamic, smart, agile, and highly motivated team in a competitive and fast-paced environment.
Follow us on LinkedIn and stay updated on our latest news. Upstream is an equal-opportunity employer.
Legal
Upstream is an equal-opportunity employer. The Company does not discriminate on the basis of race, color, creed, pregnancy, religion, gender, national origin, age, disability, marital, or any other legally protected status. The Company also makes reasonable accommodations for disabled employees. Finally, the Company prohibits the harassment of any individual based on their protected status. This policy applies to all areas of personnel actions including recruitment, hiring, training, promotion, compensation, benefits, transfer,and social and recreational programs