Best London Cybersecurity Firm Rankings

57 Companies - Rankings updated: August 25, 2026

We evaluate every agency on DesignRush according to expertise credentials and client satisfaction ratings. Some placements are sponsored.

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  • SiliconMint

    Dedicated Teams That Build Complex Software Systems

    Dedicated Teams That Build Complex Software Systems

    Founded in 2012, SiliconMint delivers cybersecurity through static and dynamic code analysis, secure product architecture, vulnerability testing, and data encryption. Trusted by Verizon and the Royal Bank of Scotland, the firm brings enterprise-grade security to fintech, banking, and telecom...

    Top Services:

    • Software Development
    • Mobile App Development
    • IoT
    • AI Development
    • Cybersecurity
    • Show more
    Location
    London, United Kingdom
    Number of Employees
    50 - 99
    Average Hourly Rate
    $55/hr
    Minimal Budget
    $25,000 - $50,000
    Portfolios Count
    7 Projects Listed
    View Profile
    4.8 4.8 (8)
    5.0 5.0 (1)

  • Quema

    Building Trust, Scaling Success: Your DevOps Journey Starts Here

    Building Trust, Scaling Success: Your DevOps Journey Starts Here

    Quema integrates offers DevSecOps automation, CI/CD pipeline security, vulnerability assessments, and compliance preparation for PCI DSS, GDPR, and SOC 2. The cybersecurity company has helped 14+ clients successfully navigate compliance audits and completed 100+ projects...

    Top Services:

    • IT Services
    • Cloud Consulting
    • Managed Services
    • AI Development
    • Cybersecurity
    • Show more
    Location
    London, United Kingdom
    Number of Employees
    Under 49
    Average Hourly Rate
    $80/hr
    Minimal Budget
    $1,000 - $10,000
    Portfolios Count
    4 Projects Listed
    View Profile
    4.8 4.8 (5)

  • Digis

    Certified Experts, Patented Excellence

    Certified Experts, Patented Excellence

    Digis integrates security throughout the SDLC, combining SAST, DAST, penetration testing, and AI-powered threat modeling under one team. With clients like HubSpot and BlaBlaCar, it offers expertise in fintech, healthcare, and eCommerce companies that want security built in, not bolted on...

    Top Services:

    • Staff Augmentation
    • Web Design
    • Web Development
    • Mobile App Development
    • IT Services
    • Show more
    Location
    London, United Kingdom
    Number of Employees
    100 - 249
    Average Hourly Rate
    $39/hr
    Minimal Budget
    $25,000 - $50,000
    Portfolios Count
    22 Projects Listed
    View Profile
    4.9 4.9 (28)
    3.0 3.0 (2)

  • Mindrops

    Web and Mobile Apps Development Company

    Web and Mobile Apps Development Company

    Mindrops is an AI-driven digital technology company delivering future-ready solutions. We build intelligent websites, smart eCommerce platforms, mobile apps, and custom software-scalable, secure, and user-friendly. Our AI expertise drives automation and business growth...

    Top Services:

    • Web Development
    • IT Services
    • AI Development
    • Software Development
    • Mobile App Development
    • Show more
    Location
    London, United Kingdom
    Number of Employees
    100 - 249
    Average Hourly Rate
    $25/hr
    Minimal Budget
    $1,000 - $10,000
    Portfolios Count
    20 Projects Listed
    View Profile
    4.9 4.9 (26)
    4.9 4.9 (119)

  • ELEKS

    Verified Verified by the DesignRush team for authenticity and credibility.
    ELEKS, a trusted partner for guaranteed software engineering excellence, quality, and transparency.

    ELEKS, a trusted partner for guaranteed software engineering excellence, quality, and transparency.

    ELEKS runs a six-stage security process from discovery to managed services, spanning penetration testing, threat hunting, and compliance. With its proprietary HITRUST-certified eCAP platform, the cybersecurity company offers expertise in complex regulatory environments...

    Top Services:

    • Software Development
    • Mobile App Development
    • Cloud Consulting
    • Cybersecurity
    • AI Development
    • Show more
    Location
    London, United Kingdom
    Number of Employees
    1000 & Up
    Average Hourly Rate
    $50/hr
    Minimal Budget
    $25,000 - $50,000
    Portfolios Count
    12 Projects Listed
    View Profile
    4.9 4.9 (22)
    5.0 5.0 (1)

  • Computools

    Unlock Tomorrow

    Unlock Tomorrow

    Computools covers the full cybersecurity stack from penetration testing and Zero Trust network security to industrial ICS/OT protection and DevSecOps integration. With multi-certified engineers, it serves fintech, healthcare, and manufacturing companies seeking compliant and hands-on threat defense...

    Top Services:

    • Software Development
    • Mobile App Development
    • Web Development
    • Cloud Consulting
    • AI Development
    • Show more
    Location
    London, United Kingdom
    Number of Employees
    250 - 499
    Average Hourly Rate
    $40/hr
    Minimal Budget
    $25,000 - $50,000
    Portfolios Count
    25 Projects Listed
    View Profile
    4.9 4.9 (14)

  • Zazz

    Modern IT. Built Secure. Delivered Right.

    Modern IT. Built Secure. Delivered Right.

    Zazz covers the full cybersecurity stack, from penetration testing and Zero Trust architecture to 24/7 SOC monitoring and incident response. Delivering 100+ security audits, the cybersecurity company offers technical depth and audit-ready compliance to its clients...

    Top Services:

    • Mobile App Development
    • IT Services
    • Software Development
    • Staff Augmentation
    • IT Compliance Solution
    • Show more
    Location
    London, United Kingdom
    Number of Employees
    250 - 499
    Average Hourly Rate
    $45/hr
    Portfolios Count
    36 Projects Listed
    View Profile
    5.0 5.0 (76)

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