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ThinkMarkets

sofiaSofiaBulgaria

Senior Network Security Engineer (Cybersecurity Lead)

full-timeOn-site
new

About ThinkMarkets

ThinkMarkets is a global financial technology company, specializing in providing multi-asset trading solutions to thousands of clients around the world. With our flagship ThinkTrader platform, we make it available for our clients to trade the world 24-hours a day. Our mission is to bridge the gap between traders, investors, and platforms by allowing access to global markets and thousands of products thus providing our clients the ability to trade the world in the palm of their hand. We use the latest technologies to give traders seamless access to our proprietary trading platforms.

We are seeking a Senior Network Security Engineer with a focus on Cybersecurity to join our rapidly growing global workforce in Sofia, Bulgaria. You will play a key role in safeguarding our financial platforms, customer data, and digital infrastructure against cyber threats. This role demands a strong understanding of financial systems, regulatory compliance, and emerging security technologies. You will serve as a network security leader and trusted authority within the networking domain.

Responsibilities:

  • Monitor and defend against cyber threats targeting financial systems and customer data.
  • Conduct regular vulnerability scans, penetration tests, and risk assessments.
  • Develop and enforce security policies, procedures, and best practices.
  • Manage and optimize SIEM, IDS/IPS, firewalls, and endpoint protection tools.
  • Investigate and respond to security incidents and breaches (e.g, DDoS attacks).
  • Stay current with emerging cybersecurity trends, threats, and technologies.
  • Collaborate with IT and engineering teams to ensure secure system architecture; maintain L2/L3 switches, routers, and firewalls.
  • Ensure compliance with financial regulations such as PCI-DSS, ISO 27001, GDPR, and FCA guidelines.
  • Drive implementation of network security best practices and contribute to infrastructure hardening efforts.
  • Lead performance analysis and latency optimization for mission-critical, customer-facing applications.
  • Contribute to disaster recovery, high availability, and security strategies in collaboration with other teams.
  • Proactively monitor network health and resolve performance bottlenecks or connectivity issues.
  • Respond flexibly to critical incidents outside normal working hours.

Requirements:

  • 5+ years of hands-on experience in network security engineering, preferably in financial services or FinTech.
  • Bachelor’s degree in Cybersecurity, Computer Science, or a related field.
  • Certifications such as CISSP, CISM, CEH, or CompTIA Security+ (CISA or CRISC are a plus).
  • Strong understanding of firewalls, VPNs, IDS/IPS, and endpoint protection.
  • Advanced understanding of the TCP/IP stack and proficiency with network profiling tools such as Wireshark, Tenable, Splunk, CrowdStrike, etc
  • Proven experience in cybersecurity, IT security, or network administration.
  • Demonstrated ability to support and enhance latency-sensitive global networks.
  • Self-starter mindset with a collaborative attitude and a passion for solving complex problems.
  • Familiarity with SIEM tools and threat intelligence platforms.
  • Excellent problem-solving and analytical skills.
  • Strong communication skills in English, both written and verbal.

Preferred Skills:

  • Familiarity with edge platforms such as Cloudflare and Arbor NetScout.
  • Experience with cloud security (AWS, Azure, GCP).
  • Knowledge of scripting languages (Python, PowerShell).
  • Strong command of Cisco platforms (NX-OS, IOS, ASA, FirePower).
  • Understanding and tuning of dynamic routing protocols (BGP, OSPF, EIGRP).
  • Deep experience with VPN technologies across MPLS, P2P, and other media.
  • Incident response and digital forensics experience.

What we offer:

  • Highly competitive remuneration. 
  • 25 days annual paid leave + birthday leave. 
  • Health & dental insurance for you, your spouse, and dependent children under 18. 
  • Hybrid working option. 
  • Fully covered Multisport card. 
  • Modern office in Infinity Tower with healthy snacks and beverages.