Lead Application Security Engineer - Pentester

We are seeking a dedicated and skilled Security Team Lead to join our dynamic team at joinus. In this pivotal role, you will be responsible for overseeing the security operations of our organization, ensuring the safety and security of our assets, employees, and clients. You will lead a team of security professionals, implementing best practices and innovative strategies to enhance our security posture.

Join Nord Security's B2B division where we create cutting-edge cybersecurity solutions, empowering businesses to safeguard their data and operations.Our multidisciplinary teams collaborate effectively across product development, engineering, sales, marketing, and data analytics to deliver robust, scalable solutions that are trusted by organizations worldwide.Your role? Drive the success of our affiliate marketing initiatives, facilitating the protection of businesses globally.

About the Role Nord Security is looking for a Mid to Senior Security Engineer to join the WebSec Team in Warsaw. This position focuses on strengthening security protocols and building solutions that protect web applications. What You Will Do Identify vulnerabilities in web applications and services Develop and implement security measures to protect users Work closely with other security professionals to improve overall security posture Contribute to the ongoing improvement of security processes and tools Who You’ll Work With Collaborate with a skilled team of security engineers and specialists, sharing knowledge and approaches to keep Nord Security’s web platforms safe.

Join us at Testronic as a seasoned Security Operations Lead where you will spearhead our Monitoring, Incident Response, and Vulnerability Management initiatives. This pivotal technical role in our Information Security department ensures the execution of effective security operations that align with policies, partner obligations, and compliance standards.We seek a proactive and analytical individual who can swiftly respond to emerging threats, bolster security controls, and serve as a trusted security partner across our organization.Key ResponsibilitiesOversee the incident response process, coordinating investigations, reporting, and post-incident remediation in alignment with established policies and partner requirements. Act as the primary InfoSec contact with clients during incidents.Supervise SIEM event monitoring and effectiveness of controls, collaborating with our external Security Partner.Manage vulnerability management, including overseeing penetration tests and coordinating patches/updates with the IT department.Conduct routine internal vulnerability assessments and risk analyses.Assist IT teams with SIEM investigations while providing technical security guidance.Generate monthly operational security reports.Support the Head of InfoSec with the ISO program, including documentation and procedural development.Participate in security awareness initiatives, alerts, and communications.Compile management reports and monitor security metrics and KPIs.Lead activities related to GDPR compliance and maintenance.Research emerging threats and industry trends to strengthen our defenses.Assist with external assessments, reviews, and investigations as necessary.Conduct penetration testing.

About Growe Growe is a business advisory and services group focused on the iGaming and Entertainment sectors. The company develops strategies and scalable solutions to help businesses adapt, enter new markets, and build long-term success. Role Overview: Support Team Lead Based in Warsaw, the Support Team Lead manages a team of Level 1 support engineers working around the clock in a 24/7 shift system. This position centers on ensuring reliable support operations, meeting Service Level Agreements (SLAs), and strengthening incident management practices. Key Responsibilities Lead and supervise a team of Level 1 support engineers in a 24/7 shift environment. Maintain high standards for support operations and ensure all SLAs are met. Act as the main escalation point for critical incidents. Improve incident management processes and workflows. Encourage operational excellence and drive continuous improvement efforts. Collaborate closely with Level 2/Level 3, Site Reliability Engineering (SRE), and DevOps teams. Build and support a strong, accountable, and high-performing support team.

At NordPass, we are dedicated to making password security effortless.We believe that logins should be both safer and simpler. Join the innovative team behind NordPass— a leading password manager relied upon by over 7 million users and more than 10,000 global enterprises to protect their credentials, cards, and sensitive information.Your impact? You will be instrumental in helping millions secure their digital lives by developing smarter and safer login solutions.Main ResponsibilitiesDesign, develop, and take ownership of security-focused backend services (including breach detection, email masking, and related tools) with a commitment to high quality, performance, and accuracy.Utilize AI-assisted workflows on a daily basis (code generation, test scaffolding, debugging, performance optimization) while continuously evaluating new tools to enhance the team's productivity.Contribute to the establishment of shared AI practices within the squad: reviewing patterns, creating prompt libraries, and setting guardrails to ensure AI-generated code meets the same standards as hand-written code.Engage in system design and architectural decision-making, advocating for solutions that are secure, scalable, and maintainable.Collaborate across functions with Frontend, Android, iOS, and Backend engineers to deliver comprehensive features across all platforms.Assume full responsibility for your creations, from design to production, ensuring uptime, reliability, and code excellence.

About the Role planner5d is looking for an Android Team Lead to guide the development of mobile applications that help users design and visualize spaces. This position is based in Warsaw. What You Will Do Lead a team of Android developers, encouraging collaboration and creative problem-solving Oversee projects from initial concept to final release Apply Android development expertise to deliver high-quality apps that reflect planner5d’s vision

Join NordLayer and be part of a cybersecurity revolution!We are creating a scalable cybersecurity platform tailored for modern teams, eliminating security concerns while enhancing productivity. With trust from over 11,000 global companies, NordLayer seamlessly integrates into any tech stack, offering robust protection across borders.Your Role: Play a crucial part in empowering businesses with cutting-edge network security solutions.Key ResponsibilitiesEnhance our codebase by crafting clean, high-quality TypeScript code, backed by rigorous testing.Provide mentorship and technical guidance to frontend developers through insightful code reviews and implementation strategies.Collaborate with backend engineers to define API contracts and ensure smooth integration between frontend and backend services.Work alongside product managers and designers to transform product requirements and UX designs into viable technical solutions.Uphold high engineering standards by promoting best practices in code quality, testing, and maintainability.Assist the team in delivering features within a Scrum framework by effectively breaking down tasks, identifying risks early, and contributing to accurate estimations.Essential Qualifications5+ years of experience in developing and maintaining modern frontend applications using React and TypeScript.Proven experience in designing frontend architectures and establishing scalable components and state management patterns.Strong knowledge of frontend performance optimization and web application best practices.Experience working with REST APIs and collaborating effectively with backend teams.Familiarity with frontend testing frameworks such as Jest, Testing Library, Cypress, or Playwright.Experience leading technical discussions within a distributed team environment.Bonus QualificationsHands-on experience in building or contributing to open-source projects.

Role Overview CD PROJEKT RED is looking for an ERP Team Lead in Warsaw. This role oversees the implementation and ongoing improvement of Enterprise Resource Planning (ERP) systems. The ERP Team Lead manages a skilled group, coordinates integration of business processes across different departments, and works to improve efficiency and support company growth.

Veeam Software stands as the trusted authority in data and AI, dedicated to empowering organizations to fully understand, secure, and ensure resilience in their data and AI systems. As a leading entity in data resilience and security posture management, Veeam is designed for the fusion of identity, data, security, and AI risk management. With our headquarters in Seattle and a presence in over 30 countries, we safeguard the operations of more than 550,000 customers globally, who rely on Veeam to keep their businesses thriving. Join us as we confidently advance together, fostering growth, learning, and making a significant impact for some of the world's most prominent brands.About the RoleVeeam Data Cloud is experiencing rapid growth, and we are focused on unifying our security strategy across all teams to ensure uniform product protection.We are in search of a Security Tech Lead who will spearhead the design and deployment of standardized security solutions and help establish a dedicated Software Security Engineering platform team. In this capacity, you will collaborate closely with the Director of Security Engineering to translate our cohesive strategy into a practical engineering roadmap, shaping a robust and integrated security framework.What You’ll DoLead the architecture and implementation of shared security primitives across Veeam Data CloudTranslate high-level security strategy into a concrete, prioritized engineering roadmap for cloud services and platform capabilitiesAct as a hands-on technical leader – write and review production code, drive design and code reviews, and provide mentorshipEstablish and promote secure-by-default patterns and shared libraries to streamline security across teamsBuild the foundation for a Software Security Engineering platform to manage shared security services and toolsCollaborate with product, platform, SRE, and compliance teams to ensure security solutions are robust and easy to adoptEnhance security posture through automation, guardrails, and policy-as-codeTechnologies You’ll Work WithLanguages & Frameworks: Go, Python, and TypeScript (and related service/API frameworks)Cloud & Platform: Modern cloud-native architectures (microservices, event-driven systems, multi-tenant SaaS) using AWS, Azure, and GCPSecurity & Identity: Authentication technologies

SoftwareMind seeks a WEBCON Consultant / Team Lead in Warsaw. This position centers on digital transformation and process automation for clients aiming to streamline operations and boost collaboration. Role overview As a WEBCON Consultant / Team Lead, the work involves guiding organizations through changes that improve business processes. The focus remains on helping clients adopt automation tools and strategies that support efficiency and teamwork. Location This role is based in Warsaw.

Join the forefront of digital privacy and security.If you are a passionate innovator who thrives on solving intricate challenges, we invite you to be a part of the team behind Threat Protection Pro, the NordLynx protocol, and the world’s fastest VPN. Together, we empower individuals to reclaim their privacy, security, and autonomy online.Your contribution? You will be instrumental in assisting millions regain control over their digital safety, privacy, and data.About Our Design Team: We are a vibrant, multidisciplinary group of product designers, web designers, UX researchers, UX writers, and graphic designers. Our mission is to pave the way for digital freedom through our suite of cybersecurity products including NordVPN, NordPass, Saily, and NordProtect. We simplify the complexities of cybersecurity for our users and embrace constructive feedback to foster growth. We cherish initiative and bold ideas.We seek a Senior Product Designer to join our NordVPN Apps Design team, focusing on crafting the future of digital security. This role involves tackling complex challenges and designing engaging, user-friendly experiences to make online privacy accessible to all.Main ResponsibilitiesLead collaborative efforts with product owners, engineering, and UX research—taking charge as a proactive problem solver.Embrace exploration: This position encourages a spirit of experimentation, allowing you to prototype innovative ideas freely.Design and Refine: Create scalable solutions for complex systems, prioritizing visual and interaction details to deliver exceptional user experiences.Foster a positive culture: Contribute to a design ethos that prioritizes speed, craftsmanship, and open feedback. Mentor fellow designers, helping everyone achieve their best work.

We are seeking a dynamic Channel Deal Desk Specialist - Team Lead to join our team in Warsaw. In this pivotal role, you will oversee the channel deal desk operations, ensuring efficient processing of deal requests, while also mentoring and guiding a team of specialists.As a leader, you will play a crucial role in optimizing our processes, enhancing collaboration between departments, and driving strategy to maximize channel partner success. Your analytical skills will be vital as you evaluate deal structures, assess profitability, and provide insights to improve our sales strategies.

Join SKELAR, a pioneering venture builder committed to establishing international tech businesses. We partner with co-founders to assemble strong teams that excel in global markets.Currently, SKELAR manages a diverse portfolio of businesses across various sectors, from EdTech to marketplaces. Our ventures have been recognized as top startups and product companies in Ukraine, featuring prominently in AppStore rankings and creating platforms used by millions. Notable media outlets like TechCrunch and Wired have covered our businesses.We take pride in our robust team of over 1,000 specialists, each possessing exceptional expertise and ambitious goals. Our people are our greatest asset, and we strive to build businesses alongside the best talent available.We are currently seeking a Golang Backend Team Lead for PawChamp, a mobile application and online platform designed for dog owners. PawChamp enables pet parents to train their dogs and learn more about care and training through 24/7 chats with experts, the AI companion Pawchie, and educational materials developed in collaboration with dog trainers. Our aim is to provide personalized daily lessons covering all aspects of dog training, from basic commands to addressing behavioral issues. Our strategic goal is to become the leading player in the global online dog training market, fulfilling all needs of pet parents and their dogs beyond training.In October 2025, we earned the title of Product of the Day on Product Hunt.App Store rating: 4.8Intro video about the product: https://www.youtube.com/watch?v=D3vURwhmufgKey Challenges:Enhancing the backend for our mobile products and the PawChamp web platform.Leading, coordinating, and developing the backend development team.Collaborating with stakeholders.Ensuring high code quality and adherence to best development practices within the team.Interacting with adjacent teams to improve system component interaction and optimize processes.Enhancing code, architecture, services, and development approaches.What We Value:

Join our dedicated team at Securitas as a Security Personnel with KPO, where you will work closely in a two-person team to ensure the safety and security of our clients. This role is integral in maintaining a secure environment and responding promptly to any incidents.

Join the forefront of online security with the world's leading VPN provider.If you are an inquisitive problem-solver eager to innovate, become a part of the team spearheading Threat Protection Pro, the NordLynx protocol, and the fastest VPN available—empowering users with enhanced privacy, security, and control over their data.Your contribution? Enabling millions to reclaim their online security, privacy, and data.Our Threat Intelligence team is committed to delivering precise and timely insights regarding potential threats to our products. Our diverse team of experts spans various disciplines, including Data Science, Malware Research, Development, and Privacy, all working towards a unified objective through the application of data feeds, heuristics, algorithms, and machine learning.Key ResponsibilitiesDesign and implement solutions to complex problems while conducting research, debugging, and data analysis across various sources;Create scalable, reliable code and document your contributions and explorations;Research, develop, and deploy data science solutions to production;Develop custom machine learning metrics to monitor model performance;Analyze validation/testing outcomes, provide explanations, and refine model designs accordingly;Collaborate with team members to plan deliverables;Perform code reviews to ensure quality;Maintain open communication regarding project progress;Mentor colleagues and share knowledge within the team;Propose enhancements to existing solutions.Core QualificationsDemonstrated experience in data science and/or mathematical modeling;Strong understanding of statistical methods (e.g., Monte Carlo, hypothesis testing, bootstrap, Bayesian inference);Extensive knowledge and practical experience with machine learning algorithms: linear regression, random forest, gradient boosted trees, neural networks, k-means, etc.;Proficiency in Python and hands-on experience with the PyData stack (e.g., Pandas, NumPy, etc.);

Join our dedicated team as a Security Officer with KPO, where you will work closely with a partner in ensuring the safety and security of our clients' premises. This role is vital to maintaining a secure environment and requires a proactive approach to security management.

Role Overview The WebSec Team at nordsec is hiring a Mid to Senior Security Engineer in Warsaw. This position focuses on strengthening the security of web applications and protecting sensitive data. What You Will Do Work with colleagues from different departments to design and implement security solutions for web applications. Safeguard digital assets by identifying and addressing vulnerabilities. Help ensure data integrity and confidentiality for users and the company. Impact Your work will help maintain user trust and keep digital systems secure, supporting nordsec’s commitment to high industry standards in cybersecurity.

Join Nord Security and innovate the future of online safety.At Nord Security, we empower users and businesses to reclaim their online privacy and security. Our diverse range of solutions—from VPNs and password managers to threat intelligence and eSIMs—are designed to address complex security challenges, earning the trust of millions around the globe.As a Senior Software Engineer, you'll play a pivotal role in enhancing our User Control Panel, ensuring users have a seamless and secure experience.Key ResponsibilitiesDesign and enhance a sophisticated User Control Panel to foster user trust and engagement, driving sustainable growth.Implement new features and improve user flows within the account management portal, including subscriptions, billing, and security options.Maintain a high-quality, scalable front-end codebase using modern best practices.Continuously enhance code quality, performance, and user experience.Write and uphold unit and integration tests alongside feature development.Contribute to the component library and design system standards.Engage in code reviews to uphold engineering excellence.Collaborate with backend engineers to define API contracts and handle errors effectively.Work with QA engineers to guarantee feature reliability and document workflows.Debug and resolve issues throughout the frontend stack, including UI rendering and state management.Advocate for best engineering practices and contribute to improving development processes.Conduct research and development activities to support new initiatives and make informed technical decisions.Mentor team members and provide technical guidance on best practices.Shape the team's technical vision and contribute to long-term goals.Essential Qualifications4+ years of experience in JavaScript and TypeScript programming.2+ years of hands-on experience with React framework.In-depth understanding of web development principles, testing methodologies, and performance optimization techniques.Proficiency in modern front-end development practices and tools.Strong problem-solving skills and attention to detail.