Senior Frontend Engineer (Security)

For our Client we are looking for an experienced Senior Frontend Engineer. The role holder’s primary responsibility is to adopt `Engineering Excellence’ across the Software Security platform. This position plays an instrumental role in driving technical delivery and best in class design & code across agile teams in the Cross Functions Teams within Security Space. Our Client is moving away from high-cost vendor-based platforms to a custom, Next.js-driven open-source architecture deployed on GCP.    📍 Location: Kraków, hybrid work model – 2 days per week in the office, 3 days remote 🕒 Cooperation model: [Full-time / B2B] 📍 Project for our Client from the financial sector   Key Responsibilities: • Implement and maintain robust Content Security Policies (CSP) and secure cookie management • Building secure authentication flows using OAuth2/OpenID Connect within Next.js Middleware • Expertise in preventing XSS, CSRF, and clickjacking at the architectural level • Build and lead communities that ‘raise the bar’ on delivering quality and efficiency Requirements: • 5+ professional experience in similar posision • Advanced proficiency in at least one modern frontend ecosystem (React, Angular or Vue) with the ability to justify architectural choices between them • Proven track record of identifying and mitigating frontend vulnerabilities (XSS, CSRF, Supply-Chain attacks) at the code level • Experience connecting frontend architectures to GCP-based microservices via type-safe API contracts (REST, GraphQL, or gRPC). • Strong mastery of TypeScript, unit/e2e testing (Cypress, Playwright), and CI/CD integration • Someone who can think few steps forward of technology and guide the team to a new direction • Hands on passionate technologist who is still delivering code to production and understands React Server Components (RSC), Server Actions, and Partial Pre-rendering (PPR) • Deep expertise in modern Component-Based Frameworks (e.g., React, Angular, or Vue) and a strong grasp of Server-Side Rendering (SSR) and Static Site Generation (SSG) strategies • Implement and maintain robust Content Security Policies (CSP) and secure cookie management • Building secure authentication flows using OAuth2/OpenID Connect within Next.js Middleware • A problem solver that can translate business opportunities into technical solutions • Build and lead communities that ‘raise the bar’ on delivering quality and efficiency • Be able to constructively challenge existing thinking and develop improved paths forward • Maintains a strong knowledge of IT development methodology, architecture design, engineering solutions, and technical standards • Mentor and share knowledge with others on the team, and outside teams where required • Always consider automation for a solution from the start. Help to reduce the toil and time-consuming portions of the technology to help developers become more agile and deliver solutions quickly and securely. • Fluent English Benefits: • Private medical care (Luxmed) • Multisport card • Collaborative team culture and modern tech stack Why apply for an Antal job offer? When your application is successful, you will be supported by a dedicated Consultant who will stay in regular contact with you (via email or phone), help you prepare for interviews with your future employer, and ensure a smooth and professional recruitment process. About Antal Antal is a leading recruitment and HR advisory company, present in Poland since 1996 and later expanded to the Czech Republic and Hungary. Across the CEE region, we employ around 150 professionals who deliver a full range of services – from specialist and executive recruitment, employee outsourcing and HR consulting, to employer branding and market research. Our division-based structure combines deep industry expertise with functional specialisation, enabling us to provide tailored solutions for companies in every sector. We act as a trusted partner for both employers and candidates, sharing our knowledge and guiding them through every stage of the talent journey. We connect exceptional people with the right opportunities and help organisations build successful teams. Discover our latest job openings: https://en.antal.pl/candidates Follow us on LinkedIn: https://www.linkedin.com/company/antalpoland