Application Security Specialist

hellokindredKnutsford

On-site Contract

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Experience Level

Mid to Senior

Qualifications

Proven experience in application security and secure coding practices. Strong understanding of security protocols, cryptography, and risk management. Experience with security testing tools and methodologies. Excellent problem-solving skills and ability to work collaboratively in a team environment. Relevant certifications (e.g., CISSP, CEH, or equivalent) are a plus.

About the job

Join our dynamic team at hellokindred as an Application Security Specialist. In this role, you will leverage your expertise to safeguard applications and protect sensitive data through rigorous security assessments and proactive threat modeling. Collaborate with cross-functional teams to implement best practices and ensure compliance with industry standards.

About hellokindred

hellokindred is an innovative tech staffing company dedicated to connecting talented professionals with leading organizations. We foster a collaborative and inclusive work culture that values creativity and growth.

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Senior Application Security Engineer

Addepar

Full-time|Remote|Remote, UK

Addepar is looking for a Senior Application Security Engineer to help protect our applications and data. This position is fully remote and open to candidates based in the UK. Key responsibilities Find and assess security vulnerabilities within applications Apply security controls and measures to address risks Collaborate with teams across the company to stre…

Apr 22, 2026

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Senior Application Security Engineer at Prolific | Remote, UK

Prolific

Full-time|Remote|Remote, UK

Prolific seeks a Senior Application Security Engineer to help protect its applications and user data. This position is fully remote within the UK. Key responsibilities Evaluate application security and spot potential risks Collaborate with engineering and product teams to design secure software architectures Improve security practices throughout the development lifecycle Support efforts to safeguard user data and maintain trust in the Prolific platform Role focus This role centers on working closely with technical teams to build security into every stage of software development. The Senior Application Security Engineer will play a part in shaping secure solutions and reinforcing Prolific’s commitment to protecting its users. Location This is a remote role open to candidates based in the UK.

Apr 27, 2026

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Application Security Engineer

Shawbrook

Full-time|On-site|Glasgow / Manchester or London

Join our dynamic team at Shawbrook as an Application Security Engineer. In this pivotal role, you will be responsible for safeguarding our applications by implementing robust security measures throughout the software development lifecycle. Your expertise will help identify vulnerabilities and enhance our overall security posture, ensuring our systems remain resilient against evolving threats.

Feb 17, 2026

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Application Security Engineer

Palantir Technologies

Full-time|On-site|London, United Kingdom

Join Palantir, a pioneering force in data-driven software solutions, as a Senior Application Security Engineer. Our mission is to empower organizations to make critical decisions that save lives, enhance security, and drive innovation. As part of our esteemed Product Security team, you will collaborate closely with cross-functional teams to implement secure-by-design principles across our product offerings. Your expertise will be crucial in conducting comprehensive security reviews, threat modeling, and guiding the architectural design to ensure robust security measures are integrated from the ground up. You will lead strategic security initiatives that enhance our entire product suite and help identify and mitigate potential vulnerabilities through advanced analysis techniques. This is an opportunity to make a significant impact in a company dedicated to transforming the world through technology.

Jun 25, 2018

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Application Security Engineer

ElevenLabs

Full-time|On-site|United Kingdom

About ElevenLabsElevenLabs is at the forefront of AI innovation, dedicated to redefining human interaction with technology.Founded in January 2023, we introduced the first human-like AI voice model and have rapidly grown to serve millions of users and numerous organizations, including major enterprises like Deutsche Telekom and Meta. Backed by distinguished investors such as Andreessen Horowitz, ICONIQ Growth, and Sequoia, we have successfully raised $781 million in funding, achieving a valuation of $11 billion.Our expansion has led to three primary platforms:ElevenAgents provides businesses with the tools to create seamless and intelligent customer experiences, offering the necessary integration, testing, monitoring, and reliability for large-scale voice and chat agent deployment.ElevenCreative empowers creators and marketers to produce and edit audio, music, images, and videos in over 70 languages.ElevenAPI offers developers access to our advanced AI audio foundational models.Our achievements are driven by the creativity and dedication of our team - a diverse group of researchers, engineers, and operators, including IOI medalists and former founders. If you're passionate about making a significant impact and are ready to work hard, we want to connect with you.How We OperateAgile Environment: We prioritize rapid experimentation, lean teams, and minimal bureaucracy.Impact Matters: We focus on the contributions you make rather than job titles; no task is too small or too large.AI-Driven: Our use of AI enhances speed and quality across all departments, from engineering to operations.Commitment to Excellence: Every output must reflect the high standards of our AI models.Global Talent: We value your skills over your geographic location.What We ProvideDynamic Culture: Join us in a generational opportunity to shape the future of AI, collaborating with a team that is continually pushing boundaries.Opportunities for Growth: Be part of a vibrant team with endless chances to make an impact beyond your immediate role.Professional Development: We are committed to your continuous learning and growth.

Feb 4, 2026

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Application Security Engineer

ion

Full-time|On-site|London

Join our dynamic team at ion as an Application Security Engineer, where you will play a crucial role in safeguarding our applications and data. You will collaborate with development teams to identify vulnerabilities and implement security best practices, ensuring that our software is resilient against threats.Your expertise will help us create secure coding standards and guidelines, conduct security assessments, and perform code reviews. You will be at the forefront of enhancing our security posture and contributing to the overall success of our projects.

Apr 1, 2026

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Staff Application Security Engineer

Ivanti

Full-time|Remote|EMEA; Italy, Remote; Netherlands, Remote; Poland, Remote; Scotland, Remote; United Kingdom, Remote

Are you a seasoned Staff Application Security Engineer eager to implement innovative security solutions and uphold technical excellence? At Ivanti, you will be instrumental in shaping the future of secure digital workplaces by designing and enhancing top-tier products utilized globally. Join our vibrant, collaborative team and make a significant impact—helping organizations securely navigate the fast-paced digital landscape. Your expertise will protect countless users while fostering innovation at every level. Why This Role Matters As a Staff Application Security Engineer at Ivanti, your role is vital in protecting our products and users from emerging threats. Your contributions will ensure trust and resilience in our technology, enabling organizations around the world to operate securely and innovate with confidence. What You’ll Do: Oversee the integration of security best practices across all stages of the software development lifecycle, guaranteeing robust protection for Ivanti's products, services, and IT assets. Develop innovative and scalable security tools, processes, and solutions to proactively identify, remediate, and mitigate vulnerabilities in extensive and complex codebases. Design secure architectures, conduct thorough threat modeling, and lead penetration testing and code reviews for both web and mobile applications to uphold the highest security standards. Collaborate with development, operations, and architecture teams to deeply embed security into DevOps practices and promote a culture of continuous security awareness throughout the organization. Lead security education initiatives by providing clear, actionable training and documentation to cross-functional teams, driving vulnerability remediation efforts with stakeholders of varying technical expertise. Work with global product and engineering teams, business leaders, and third-party security vendors to interpret vulnerability reports and coordinate effective security solutions and disclosure programs. Advise stakeholders on prioritizing vulnerabilities, enforcing secure coding standards, applying cryptographic techniques, and adopting industry-leading security protocols and compliance practices.

Apr 10, 2026

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Principal Solutions Engineer - Application Security

Wiz Inc.

Full-time|Remote|Remote - United Kingdom

Wiz Inc. works at the center of cloud security, helping organizations protect their cloud environments and support business growth. The company’s platform scans and secures over 230 billion files every day, serving a global customer base that includes more than half of the Fortune 100. Wiz’s team brings together professionals from over 20 countries, collaborating to safeguard the infrastructure of some of the world’s largest companies. Security teams worldwide rely on Wiz’s expertise and solutions. Role overview The Principal Solutions Engineer - Application Security will play a key part in supporting Wiz’s customers as they secure their cloud applications. This role offers the chance to work with a diverse team and contribute to the protection of critical cloud infrastructure. What makes Wiz unique Trusted by security teams at leading global companies Handles security for a significant share of the Fortune 100 Processes and protects massive volumes of data daily Encourages creative approaches and values each team member’s expertise More information about Wiz’s growth can be found here.

Apr 30, 2026

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Application Security Engineer at Writer | London, UK

WRITER

Full-time|Hybrid|London, UK

About WRITERWRITER is at the forefront of empowering the world's leading enterprises with AI-driven solutions. Our mission is to enhance human capabilities through superintelligence, proving that transformative, reliable AI is achievable. By bridging IT and business teams, we enable organizations to undergo enterprise-wide transformations. Hundreds of renowned companies, including Mars, Marriott, Uber, and Vanguard, utilize WRITER's comprehensive platform to build and deploy AI agents based on their unique data, powered by our enterprise-grade LLMs. With a valuation of $1.9B and support from top-tier investors like Premji Invest, Radical Ventures, and ICONIQ Growth, WRITER is solidifying its role as a pioneer in enterprise generative AI.Founded in 2020, and with offices in San Francisco, New York City, Austin, Chicago, and London, our dynamic team is dedicated to innovative thinking and swift action. We invite talented, dedicated builders and visionaries to join us in shaping the future of work through AI. About the RoleJoin us as a Security Engineer specializing in Application Security at WRITER, where security innovation meets enterprise-scale challenges. You will lay the foundational security measures to safeguard the AI systems that support some of the most recognizable brands globally. Collaborating closely with engineering teams, your role will be pivotal in integrating security into every aspect of our coding processes, ensuring our platform remains robust and trustworthy.This is a tremendous opportunity to shape the security landscape for enterprise AI applications, from threat modeling our LLM architectures to creating scalable automated security controls across our growing platform. Embrace the challenge of discovering creative solutions that allow us to proceed securely. You will encounter unique hurdles that most security engineers may never face, including securing AI agents, shielding training data pipelines, and designing controls for systems that are still in their infancy.This position offers the flexibility of remote work within the US or a hybrid model from our San Francisco or New York City offices, with direct reporting to the Head of Security Engineering.

Feb 12, 2026

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Application Security Specialist

hellokindred

Contract|On-site|Knutsford

Join our dynamic team at hellokindred as an Application Security Specialist. In this role, you will leverage your expertise to safeguard applications and protect sensitive data through rigorous security assessments and proactive threat modeling. Collaborate with cross-functional teams to implement best practices and ensure compliance with industry standards.

Mar 13, 2026

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Senior Application Engineer / Developer

Telefónica Tech

Full-time|On-site|London

Join Our Team as a Senior Application Engineer / DeveloperAre you passionate about crafting cutting-edge AI and cloud-native applications that leave users in awe? Are you eager to explore the frontiers of software delivery, AI engineering, and innovative application patterns? If you have a knack for developing intelligent applications that push the boundaries of technology, we want to hear from you!In this dynamic role, you will be at the forefront of building AI-driven solutions, focusing on hands-on development to create applications that challenge the status quo.Key Responsibilities:Design, build, test, and deploy state-of-the-art applications.Transform software delivery processes in the AI and cloud era.Evaluate AI code generation for accuracy and functionality.

Jan 30, 2026

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Senior Security Engineer

Abound

Full-time|On-site|London

Abound is changing how consumer lending works in the UK and beyond. By combining advanced AI with Open Banking data, the company looks at a person’s complete financial situation, not just a credit score, to make lending decisions that are fairer and more accurate. Since launch, Abound has issued over £1.3bn in loans, with a credit performance that outpaces industry averages. The company became profitable within 2.5 years and has backing from major investors, including Citi and Deutsche Bank. With over £2bn in funding, Abound is recognized as one of Europe’s fastest-growing fintechs. Role overview This Senior Security Engineer position is based in London and sits within the Platform team. The role blends DevSecOps responsibilities, serving as a bridge between product engineering and Corporate IT. As a hands-on contributor, the Senior Security Engineer critically reviews security architecture across both production and internal IT environments. During the first 6 to 12 months, the focus will be on designing and implementing next-generation cloud security architecture in AWS and GCP. The role also involves building and maturing internal SOC capabilities, particularly around detection and response. What you will do Manage Microsoft Sentinel to strengthen SIEM/SOAR capabilities Automate RBAC for identity and access management across AWS, Microsoft Entra, and internal systems Embed security controls into GitLab CI/CD pipelines, including scanning, infrastructure-as-code reviews, and automated policy enforcement Support a shift-left approach by integrating security throughout the software development lifecycle Technology stack Cloud & Compute: AWS, ECS Fargate, Aurora, Lambda, GCP Data Lake: S3, DMS, Glue Security & Identity: Microsoft Defender (XDR), Microsoft Sentinel (SIEM/SOAR), Defender for Cloud (CSPM), Microsoft 365, Entra, Intune Cloud Security Tooling: GuardDuty, Security Hub, Inspector, Security Command Center Code & Infrastructure: Terraform, GitLab CI/CD

Apr 24, 2026

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Application Security Manager

Unily

Full-time|On-site|Lower Eashing, United Kingdom

Job PurposeAs Unily continues to strengthen its position in the rapidly evolving Employee Experience platform market, we are seeking an experienced Application Security Manager. This pivotal role will be responsible for designing and implementing a robust application security program that seamlessly integrates strategic management with practical technical execution. The Application Security Manager will ensure that security practices are ingrained throughout the software development lifecycle (SDLC), allowing Unily to deliver secure products efficiently.The Application Security Manager will establish and enforce secure development policies, advocate for privacy by design principles, and manage the risk and escalation process. Additionally, the role will involve active participation in technical assurance activities, including threat modeling, application testing, dependency analysis, cloud and container security assessments, and CI/CD pipeline hardening.This role serves as both a strategic partner to leadership and a trusted advisor to engineering teams, acting as a key point of contact for clients when necessary.

Mar 15, 2026

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Lead Application Security Specialist

Prolific

Full-time|Remote|Remote, UK

Prolific seeks a Lead Application Security Specialist to strengthen the security of its applications and systems. This is a fully remote role open to candidates based in the UK. Key responsibilities Manage and mentor a team dedicated to application and system security. Detect vulnerabilities and implement solutions to address them. Maintain compliance with industry security standards. Role impact This position directly shapes the security practices behind Prolific’s products and services. The Lead Application Security Specialist plays a central part in managing risk and supporting the organization’s reputation for trustworthiness.

Apr 27, 2026

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Senior Application Engineer

TrustedHousesitters

Full-time|Remote|Remote, United Kingdom

We are on the lookout for a talented and experienced Senior Application Engineer to join our dynamic team at TrustedHousesitters. As a key player in our engineering department, you will be responsible for designing, developing, and maintaining high-quality applications that enhance our platform. You will collaborate with cross-functional teams to deliver innovative solutions that meet our users' needs.If you are passionate about coding, problem-solving, and creating exceptional user experiences, we want to hear from you!

Mar 16, 2026

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Senior Application Engineer

Luminance

Full-time|On-site|Cambridge, England, United Kingdom

Join Luminance, a trailblazer in Legal-Grade™ AI for enterprises, and be part of an innovative journey that is reshaping the legal industry worldwide. Supported by prestigious venture capitalists and recognized in both the Forbes AI 50 and Inc. 5000 lists, Luminance is on a record growth trajectory. We are eager to welcome passionate and experienced developers to accelerate our ambitious mission.We are looking for talented and motivated Senior Engineers to lead our most significant projects. This crucial role is for a technical expert who embraces challenges and is ready to work diligently, guide with vision, and create an impact that resonates throughout the industry.ResponsibilitiesOversee intricate engineering projects across the full Software Development Life Cycle (SDLC).Mentor and inspire other members of the Application Engineering team, fostering a culture of continuous learning and development.Collaborate with cross-functional teams to establish technical requirements and system architecture.Champion best practices in coding, testing, and maintenance, ensuring excellence in software development.Own decisions and be accountable for outcomes, pushing the limits of innovation.Serve as a Subject Matter Expert in one or more areas of our technology stack and support others in those domains.

Jun 6, 2025

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Senior Security Engineer

Deliveroo

Full-time|On-site|London - The River Building HQ

Why Join Deliveroo?At Deliveroo, our mission is to revolutionize how people shop and dine by seamlessly connecting consumers, restaurants, shops, and delivery riders. We strive to make food and product accessibility more convenient and enjoyable, empowering individuals to purchase what they want, when and where they desire.As a forward-thinking, technology-driven organization, we are leading the charge in one of the fastest-growing industries globally. Our small team is making a significant impact as we tackle some of the most fascinating challenges. We prioritize speed, autonomy, and innovative ideas, continuously seeking fresh perspectives.About the RoleIn the role of Senior Security Engineer, you will spearhead the development and implementation of security measures that safeguard our internal networks, workforce identities, endpoints, and corporate systems. Collaborating with security teams across the US, EU, and APAC, you will aim to minimize risk and enhance our security controls.Operating with significant independence, you will define the technical strategy, make architectural decisions, and oversee the execution of complex security projects from start to finish. Your focus will be on balancing risk mitigation with user experience, ensuring that security measures are effective without hindering employee productivity.This position emphasizes Identity and Access Management (IAM), Endpoint Security (EDR), Network Security, logging and detection engineering, and secure SaaS enablement. You will collaborate closely with IT, Legal, Privacy, Engineering, and business stakeholders to ensure that security is integrated as a fundamental practice across the organization.Our security protocols are aligned with recognized frameworks such as the CIS Critical Security Controls and the NIST Cybersecurity Framework (CSF).

Feb 24, 2026

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Senior Security Engineer

Checkatrade

Full-time|On-site|Moorgate London

Join Checkatrade as a Senior Security Engineer and play a pivotal role in safeguarding our systems and data. In this position, you will be responsible for designing and implementing robust security measures, monitoring potential threats, and ensuring compliance with industry standards. We seek a proactive individual who thrives in a fast-paced environment and is dedicated to continuous improvement.

Mar 30, 2026

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Senior Security Engineer

Apollo Research

Full-time|On-site|London

Application Deadline: We are actively conducting interviews and aim to fill this position promptly as soon as we find the right candidate.THE OPPORTUNITYApollo Research is searching for a Senior Security Engineer to take full ownership of security protocols and practices within our organization. As the first dedicated security hire, you will play a crucial role in maintaining the trust of our innovative AI lab partners and supporting our research mission. This position is embedded within the engineering team and reports directly to the CEO.YOUR RESPONSIBILITIES WILL INCLUDE- Establishing and leading Apollo's security program. You will create and manage the security roadmap, perform risk assessments, and adapt the program as the organization evolves, defining the security posture in relation to our size, threat model, and partner relationships.- Fostering trust with our AI lab partners. You will be the primary contact for security teams of our partners, building relationships with their CISOs, and ensuring our security practices are documented and meet the necessary standards for our partnerships.- Setting security strategies for engineering. You will define security principles and an AppSec strategy that the engineering team will adopt, creating efficient pathways for secure development.- Defining the use of AI tools and integrations at Apollo. You will determine approved tools, data handling procedures, and vetting processes for new technologies, ensuring a balance between security and the need for cutting-edge research tools.- Managing our security tooling stack and automating operations. You will select, implement, and oversee security controls such as EDR/MDR, endpoint management, email protection, and identity management, while automating processes wherever feasible.- Leading compliance and certification efforts. You will spearhead certification initiatives (ISO 27001, SOC 2) as required, integrating compliance into our security practices.- Managing IT administration across the organization. You will oversee Google Workspace and other IT resources.

Mar 6, 2026

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Senior Application Operations Engineer

Egis Group

Full-time|On-site|South Mimms

Join our team as a Senior Application Operations Engineer at Egis Group, where you will play a pivotal role in ensuring the seamless operation and optimization of our applications. Your expertise will be crucial in supporting our clients' needs and enhancing system performance.

Feb 17, 2026

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