18 Best Website Security Companies in Europe (2026)

Gilzor works with startups, small and medium-sized businesses, and product companies that need support throughout different stages of digital product development. Our team combines software engineering with business analysis, design, quality assurance, and product strategy to help clients move from an initial idea to a finished product. Instead of treating development as a standalone process, we focus on understanding business goals, validating concepts, and building solutions that match real user needs. Alongside custom software development, we support businesses across Europe with secure web and mobile solutions that help protect digital products while meeting the practical needs of different markets and industries.

Website security fits naturally into our approach because secure products require more than technical protection after launch. Our scope includes quality assurance, business analysis, and ongoing maintenance as part of the development process, helping businesses reduce security and performance risks before products reach users. As a rule, our work continues after release with product support, user feedback analysis, and improvements that keep applications stable as they evolve.

NCC Group is a cybersecurity company that helps organizations understand their current security position before planning improvements. Their work is built around structured cyber security reviews that assess business operations, existing controls, risks, and vulnerabilities using recognized security frameworks. This process gives organizations a clear picture of their security maturity and provides a practical roadmap for strengthening their defenses over time.

Website security is part of a broader security strategy that includes risk assessment, threat analysis, compliance, and ongoing improvement. NCC Group combines technical assessments with business context to help organizations prioritize security investments and prepare for evolving cyber threats. Alongside reviews, they support remediation efforts, incident readiness, and long-term resilience through consulting and managed security services.

Mobian Studio is a European software development company that builds dedicated engineering teams and delivers digital products for businesses across industries such as healthcare, fintech, logistics, and IT. Their work covers mobile applications, AI solutions, backend systems, cloud infrastructure, and software integration. Clients can choose between full project delivery or adding experienced engineers to their existing teams, depending on their development needs.

Mainly, security is treated as part of building reliable software rather than as a separate stage of development. Mobian combines clean architecture, documented code, quality assurance, and scalable infrastructure to create applications that remain stable as products grow. Ongoing support after launch, system integration, and long-term maintenance help businesses keep their software secure, updated, and ready for future changes.

Integrity360 helps organizations build and maintain cybersecurity programs that cover the full security lifecycle, from risk identification to incident response and recovery. Instead of concentrating on a single area of protection, the company brings together managed security services, compliance support, threat monitoring, and cybersecurity testing to help businesses strengthen their overall security posture.

As a rule, website security is integrated into a broader approach that includes protecting cloud environments, endpoints, identities, and sensitive business data. Continuous monitoring, Security Operations Centres, and incident response services help organizations respond to evolving threats while maintaining secure online operations.

Itexus focuses on software development for banks, fintech companies, brokers, and other financial organizations working in regulated environments. Business analysis, software architecture, DevOps, quality assurance, and AI implementation are combined into one delivery process, allowing the team to build financial platforms that remain reliable, scalable, and secure throughout their lifecycle.

Security is embedded into every stage of development rather than added after deployment. Mainly, Itexus supports financial organizations with secure application architecture, penetration testing, infrastructure protection, compliance readiness, and continuous maintenance. This approach helps reduce operational risks while keeping systems stable as products and regulatory requirements evolve.

Myra Security develops cloud-based cybersecurity solutions designed to protect websites, applications, APIs, and network infrastructure. Its Security as a Service platform combines application protection, network security, and performance optimization in a single environment, giving organizations centralized control over critical online services.

Mostly, organizations use Myra Security to reduce the impact of DDoS attacks, malicious bots, application vulnerabilities, and other web-based threats while meeting regional compliance requirements. Alongside website protection, the platform includes traffic management, certificate handling, content delivery, and continuous monitoring that support secure and reliable digital operations over the long term.

OSKI offers custom software for technology companies, startups, and businesses looking to modernize their digital operations. Cloud platforms, AI solutions, frontend development, and content management systems are all part of their development portfolio, allowing clients to build and maintain software through a single engineering team. Alongside development, they support projects from planning through deployment and ongoing maintenance.

Security is built into the way their software is designed and delivered. Cloud infrastructure, DevOps practices, scalable architectures, and reliable CMS development help businesses keep websites and digital platforms stable while protecting business data and supporting long-term growth. Their experience also covers industries where secure digital services are an important part of daily operations.

Link11 specializes in cloud-based cybersecurity solutions that help businesses keep websites, applications, APIs, and networks available during cyberattacks. The company focuses on protecting online services from DDoS attacks while reducing downtime through automated traffic analysis, cloud infrastructure, and security intelligence. Their platform is designed to respond to attacks in real time without interrupting normal user activity.

Beyond DDoS mitigation, Link11 provides broader web application protection through its cloud WAAP platform. Security services include traffic filtering, global load balancing, expert monitoring, and support for compliance requirements. This combination helps organizations strengthen website security while maintaining reliable performance under changing traffic conditions.

21CENTURY.TECH builds software using a development process that combines experienced engineers with AI-assisted workflows. Architecture, business logic, quality assurance, and final reviews remain under human control, while AI is used to accelerate coding, documentation, testing, and repetitive engineering tasks. This approach allows projects to move from planning to production in shorter development cycles without changing engineering standards.

Reliable software depends on more than delivery speed, so every feature goes through review and testing before release. Code quality, documentation, and quality assurance are integrated into the development process, helping businesses launch web applications and digital products with a stronger technical foundation and fewer issues after deployment.

Better Security Management specializes in penetration testing and information security services that help organizations identify weaknesses before they become security incidents. Website assessments go beyond automated scans by examining web applications, supporting infrastructure, login interfaces, third-party integrations, and other potential entry points that attackers commonly target. Their testing process is followed by practical recommendations that help development and IT teams address identified risks.

The company also supports businesses with broader cybersecurity assessments, including internal networks and custom applications. Close collaboration throughout the testing process allows technical teams to understand findings more clearly and prioritize improvements that strengthen website security over time.

LENGREO combines website development with digital marketing services to help businesses strengthen their online presence and generate sustainable business growth. Their work covers business analysis, website planning, development, quality assurance, and long-term optimization, allowing companies to improve both technical performance and marketing effectiveness through a single partner.

Website quality is supported through structured development, technical audits, and ongoing maintenance rather than treated as a separate activity. SEO, content strategy, performance improvements, and website optimization help businesses maintain reliable websites while creating a stronger foundation for visibility, lead generation, and customer engagement.

Sentrium Security provides penetration testing services that help organizations identify vulnerabilities in websites, web applications, APIs, cloud environments, and supporting infrastructure. Their security assessments simulate real-world attack techniques to uncover weaknesses before they can be exploited, giving businesses a clearer understanding of their security risks and practical guidance for remediation.

Website penetration testing is carried out using both automated and manual techniques, covering authenticated and unauthenticated scenarios as well as common application security risks. Alongside testing, Sentrium supports organizations with broader cybersecurity advisory services, helping internal teams improve security controls, regulatory readiness, and long-term resilience.

A-listware provides software development, IT consulting, infrastructure, and cybersecurity services for startups, small and medium-sized businesses, and enterprise organizations. Their work combines dedicated development teams with application services, quality assurance, cloud technologies, and IT support, allowing clients to build and maintain secure digital products through a single technology partner. Flexible engagement models also make it possible to expand existing engineering teams when additional expertise is needed.

Security is integrated across both software development and infrastructure management. Beyond cybersecurity services, the company supports businesses with secure coding practices, quality control, cloud management, infrastructure support, and continuous maintenance to help applications remain reliable throughout their lifecycle.

Deutsche Telekom places data privacy and cybersecurity at the center of its digital services and business operations. The company develops security practices that help protect networks, customer information, and digital infrastructure while supporting responsible data management. Security is treated as an ongoing process that combines technology, governance, and operational controls across a large communications ecosystem.

Protection of digital services is supported through a strong focus on privacy, secure infrastructure, and continuous investment in network resilience. Alongside telecommunications services, the company promotes responsible handling of customer data and implements security measures designed to maintain reliable digital communication and online services.

SoftPro develops custom software for businesses looking to modernize internal processes and build scalable digital products. Their expertise covers software engineering, web application development, cloud technologies, artificial intelligence, and Microsoft-based solutions. Projects are built around business requirements, with an emphasis on reliable architecture, integration, and long-term maintainability.

Software quality and security are considered throughout the development process rather than added at the end of a project. Cloud infrastructure, modern development frameworks, and ongoing maintenance help businesses keep web applications stable, secure, and prepared for future growth while supporting changing operational needs.

Bulletproof delivers managed IT, cybersecurity, and compliance services that help organizations protect complex digital environments through a single technology partner. The company supports businesses with continuous security monitoring, cloud protection, identity security, compliance, and IT operations, allowing internal teams to manage security and infrastructure more efficiently.

Their managed security services combine threat prevention, detection, investigation, and incident response across cloud platforms, applications, endpoints, and networks. Alongside cybersecurity, Bulletproof helps organizations strengthen governance, modernize infrastructure, and improve data protection through ongoing management and expert support.

Net-devs builds enterprise software using a delivery model where experienced engineers guide every stage of development while AI accelerates implementation, testing, and documentation. Architecture, technical decisions, and quality control remain under senior engineering leadership, helping businesses deliver software faster without reducing engineering standards.

Security and software quality are treated as core parts of the delivery process. Automated and manual testing, cloud-native architectures, and production-focused quality assurance help ensure applications remain stable, secure, and ready for continuous development after deployment.

PortSwigger is known for developing web application security tools used by penetration testers, developers, and security teams around the world. Its Burp Suite platform supports vulnerability discovery, dynamic application security testing, manual penetration testing, and automated scanning, helping organizations identify security issues before they reach production environments.

Alongside its security products, the company contributes to web security education through research, training, certifications, and its Web Security Academy. This combination of testing tools and technical learning resources helps organizations strengthen application security while improving the skills of development and security teams.