Senior Frontend Engineer | React Specialist | Network Security

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…

Join the innovative team at nordsec as a Senior Frontend Engineer specializing in React within our Network Department. In this role, you will leverage your expertise to create dynamic and responsive user interfaces that enhance our network solutions. Collaborate with cross-functional teams to deliver high-quality software that meets our users' needs.

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.

Capital, a global trading platform headquartered in Warsaw, focuses on technology-driven solutions and a user-centered experience. As the company expands, it seeks professionals who can help reinforce its technical foundation. Role overview The Network Security Engineer takes on a central role in safeguarding Capital’s infrastructure and network. This position involves building, maintaining, and improving security systems that support the safety and reliability of the platform for users around the world. Main responsibilities Develop and maintain monitoring systems for network and infrastructure Automate security processes to boost operational efficiency Support ongoing improvements to the company’s security framework What Capital offers Work with recognized products and advanced technology Join a globally respected team Opportunities to make a meaningful impact on security operations

Join Fairmarkit as a Senior Frontend Engineer and be a key player in revolutionizing the procurement process. You will design and implement user-centric web applications that elevate the user experience. Collaborate with cross-functional teams to create scalable and maintainable solutions while ensuring high performance and responsiveness.

Location: Warsaw, Poland - Hybrid (4 days on-site / 1 day remote)Contract: B2B · 25-40 k PLN net / month + RSUsWhy Fresha & Why Now?Fresha is revolutionizing the global beauty and wellness industry. With over 120,000 businesses, 450,000 professionals, and millions of clients, our platform manages more than 1 billion appointments, streamlining everything from scheduling to payments.Join us during this explosive growth phase—your contributions will be visible across the globe in a matter of days, not months.What You’ll DoAt Fresha, we view AI as a catalyst for accelerating feature delivery, not merely as a coding aid. We equip our engineers with cutting-edge tools (such as Claude, GitHub Copilot, and Cursor) to minimize mundane tasks. This allows you to concentrate on delivering impactful product features. We seek engineers who can effectively utilize these resources to enhance productivity within our 6-week cycles, expediting the transition from concept to code while ensuring technical integrity, security, and a superior user experience.* Take charge of our core booking & scheduling engine—the heartbeat of Fresha—ensuring it scales efficiently and provides seamless experiences for millions.* Design, construct, and launch new user-facing features using React + TypeScript, impacting a vast audience of professionals and clients.* Manage features from inception to completion: research, technical design, implementation, testing, deployment, and monitoring.* Utilize (and enhance) our Design System to rapidly deliver refined UI while elevating standards for consistency.* Develop robust automated tests (Cypress, Jest, React Testing Library) and maintain a healthy CI/CD pipeline.* Collaborate closely with Product, Design, Backend, Infrastructure, and Mobile engineers to bring features from ideation to launch and beyond.* Accelerate your efforts with AI: leverage AI agents, LLM-powered coding tools, and access a variety of AI resources (e.g., chatbots, development assistants).* Interested in backend, DevOps, or mobile? Grow your skills in those areas too!

Fraud Warning: Beware of potential scams posing as legitimate job opportunities. To ensure your application is considered, please apply only through the official Sensor Tower website or directly through our authorized profiles on platforms like LinkedIn, Indeed, BuiltIn, or Hackajob. Sensor Tower will never request payment, credit card, or bank account information during the application process. All official communications will originate from email addresses ending in sensortower.com. Interviews will be conducted via phone or Zoom, and no conversations will shift to external email or text platforms. If you encounter any issues, please reach out to us. Remember to attach your resume when applying.Recruitment Agencies: Sensor Tower does not accept unsolicited resumes from third-party agencies. Please refrain from sending resumes to our job alias, employees, or any other location. Sensor Tower will not cover fees related to unsolicited resumes and will not compensate agencies without a signed agreement.About This Role:Are you excited by the dynamic environment of a startup?Do you have a passion for developing high-impact, rapidly deployed products?Are you committed to mentoring emerging engineers and championing technical excellence?Join us in revolutionizing how insights are derived in digital marketing!Apply today!Role Summary:As a Mid / Senior Frontend Engineer at Sensor Tower, you will play a crucial role in developing top-notch products and features that enhance our user experience. Our flat organizational structure allows for your input to significantly influence product design and development.

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.

Role Overview EcoVadis is hiring a Senior Application Security Specialist in Warsaw. This role focuses on protecting company applications and systems. The specialist will work to find vulnerabilities, put security controls in place, and partner with teams across the business to strengthen security practices. Key Responsibilities Identify and assess security vulnerabilities in applications and systems Implement measures to reduce risk and improve security Collaborate with cross-functional teams to support secure development and operations

Join our dynamic UCP team at Nordsec as a Senior Software Engineer specializing in React. In this role, you will engage in developing innovative software solutions that enhance user experiences and drive our mission forward. Your expertise in React and software development will be pivotal in designing, implementing, and maintaining high-quality applications.As a member of our team, you will collaborate with cross-functional teams, contribute to architectural decisions, and mentor junior developers. We value creativity, problem-solving, and a commitment to excellence.

Join our dynamic Product Security team as a Senior Platform Security Engineer, where your expertise will be crucial in safeguarding our platform that supports multiple products and handles sensitive, high-value information. With our operations expanding, we seek two professionals to strengthen our security efforts.Your role will involve hands-on engineering, where you will design, build, and deploy robust security and privacy controls. This is not about merely defining policies; you will actively contribute to the security architecture of our systems.Your responsibilities will include enhancing supply-chain security through SAST, SCA, container scanning, and CI/CD hardening. Expect a varied role that will challenge you across multiple domains without confining you to a single specialty.What Success Looks Like:Within 90 days, you will have implemented significant, production-level security enhancements.You will take ownership of components of the AuthN/AuthZ model and its execution.You will develop a comprehensive understanding of our data flows and associated privacy risks.Establish yourself as a trusted advisor across teams, able to confidently voice concerns and provide rationale.Effectively reduce risk through practical measures rather than superficial security actions.Your Work Style:This role offers a high degree of autonomy, encouraging you to identify and address issues independently.You will collaborate closely with engineers from different teams, fostering a culture of teamwork.Engaging in constructive disagreements is encouraged, with decisions rooted in data and threat modeling.You will have the authority to block releases on security or privacy grounds when necessary, following clear escalation paths.Proactively addressing problems, even beyond your immediate area, is expected.

Join our dynamic team at evolution as a Frontend Developer, where you will play a crucial role in designing and implementing innovative web applications. You will collaborate with cross-functional teams to deliver exceptional user experiences while utilizing the latest technologies. If you have a passion for frontend development and a desire to create impactful digital solutions, we want to hear from you!

Join Saily, where we simplify staying connected while traveling — no roaming fees, no plastic SIM cards, just high-speed, secure mobile data accessible in over 200 destinations. With millions of satisfied customers and countless travelers using Saily at any time, we are dedicated to enhancing their experience.At Saily, we cultivate an AI-driven Product Engineering culture that empowers our engineers to:Own the product development lifecycle from concept to deployment.Leverage AI Agents to automate repetitive coding tasks, maximizing their productivity.Continuously identify and implement improvements within our processes.Embrace curiosity and encourage knowledge sharing.Focus on delivering a seamless, connected experience for our customers.We prioritize growth, contribution, and impactful work over comfort and hierarchy. At Saily, we provide our talented team members with the autonomy and resources they need to excel.Key ResponsibilitiesEnhance our product by developing and maintaining innovative features.Create functionalities that support multi-dimensional personalization, A/B testing, and data analytics.Maintain a robust and high-quality codebase.Continuously seek opportunities to improve code quality and system performance.Provide mentorship on development best practices and offer technical guidance to peers.Contribute to the overall vision and long-term goals of the team.Conduct research and development as needed.Collaborate within a cross-functional team to ensure clear communication among all members.Work alongside engineering, product, and design experts from other teams.Note: This position requires in-office attendance three times a week.

Join our dynamic team at Capital as a Senior Full Stack Engineer, where you will play a crucial role in developing innovative web applications using React and Node.js. You will be responsible for designing and implementing scalable solutions, collaborating with cross-functional teams, and mentoring junior developers. If you are passionate about technology and eager to make an impact, we want to hear from you!

Join Box as a Senior Frontend Software Engineer in Warsaw, Poland, and play a pivotal role in shaping the future of content management. As part of our dynamic team, you will craft and maintain engaging user interfaces that enhance the experience for over 115,000 organizations globally. Your expertise will help drive collaboration and streamline workflows through innovative, AI-powered solutions. You'll be responsible for documenting software specifications, participating in agile ceremonies, and fostering a collaborative work culture. This is an exciting opportunity to be at the forefront of a technological revolution in the content cloud space.

Join our dynamic team as a Senior Frontend Developer at evolution in Warsaw! We are looking for a talented individual with a passion for building responsive and high-performance web applications. You will collaborate with cross-functional teams to deliver exceptional user experiences and implement innovative solutions.

Nord Security’s B2B group develops cybersecurity products that help organizations safeguard their data and daily operations. The team combines expertise from product development, engineering, sales, marketing, and data to deliver security solutions used by businesses worldwide. Role overview As a Senior Automation QA Engineer on the Apps Team in Warsaw, this position focuses on strengthening the quality of Nord Security’s products for a global client base. The work directly supports enterprises in protecting their people, systems, and information. What you will do Build a test automation framework from the ground up. Design and maintain automated testing suites that cover multiple platforms. Identify, document, and track software defects, collaborating with developers to resolve them. Work closely with product managers, developers, and other QA professionals to ensure high product quality. Requirements Experience creating and maintaining native testing solutions. Proficiency in JavaScript and TypeScript. Strong understanding of native application architecture. Advanced skills with Appium and related automation tools. Ability to use AI coding tools responsibly, ensuring code quality and sound system design. Keen attention to detail. Initiative and a sense of ownership, especially when launching new projects. Clear communication skills, both written and spoken. Compensation Gross monthly salary: 20,700 - 26,800 PLN Benefits Collaborate with international experts to develop cybersecurity tools used by millions. Access to ongoing learning and professional growth in a supportive environment.

Saily, part of Nord Security, is looking for a Senior Android Engineer with strong Kotlin skills to help shape and improve our mobile applications. This role centers on building new features and refining app performance for a better user experience. What you will do Design and implement features for Android applications using Kotlin Work closely with cross-functional teams to deliver high-quality solutions Troubleshoot and resolve technical issues as they arise Maintain high coding standards throughout the development process Requirements Extensive experience in Android development Proficiency with Kotlin Strong problem-solving skills and attention to detail Comfort working collaboratively with diverse teams This position is based in Warsaw and offers the chance to work on challenging projects in a collaborative setting.

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.

Join the forefront of digital security with the world's most advanced VPN.As a passionate innovator and problem-solver, become part of the team that developed Threat Protection Pro and the NordLynx protocol—the fastest VPN globally. Our tools empower individuals by reclaiming their privacy, security, and control over their digital lives.Your Contributions: Play a pivotal role in helping millions regain authority over their online security, privacy, and data.Key Responsibilities:Design, develop, and sustain data curation and ingestion services tailored for the Threat Intelligence team.Collaborate on and implement robust architectural solutions, including distributed computing pipelines, microservices, and database integrations.Engage actively in code reviews, provide constructive feedback, and ensure top-notch technical documentation.Innovate and design new services to enhance data feed quality.Maintain adherence to coding standards, ensuring code is maintainable, readable, and secure, while fostering a results-oriented mindset.Continuously generate and discuss new ideas in the context of product development and cybersecurity.Offer technical guidance and leadership to team members.Essential Qualifications:Proficient in Python, with a strong grasp of core concepts, syntax, and data structures.Experience in designing microservice architectures and facilitating effective communication.Familiarity with data storage solutions, especially PostgreSQL.Ability to write clean, maintainable, and efficient code.Hands-on experience with cloud infrastructure technologies such as Docker and Kubernetes.Exceptional problem-solving skills with a knack for analyzing and resolving complex issues.Demonstrated capacity for rapid learning and proactive problem detection.Detail-oriented with a structured approach to research and implementation.