{"id":573990,"url":"https://alion.io/job/f5-sr-full-stack-engineer","title":"Sr Full Stack Engineer","company":{"id":5759,"name":"F5","domain":"f5.com","url":"https://alion.io/company/ffive","size_band":"1001-5000","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Workday","truth_index":{"grade":"B","score":83,"open_postings":21,"ghost_share":0,"stale_share":0.667,"repost_share":0,"time_to_fill_p50_days":43,"computed_at":"2026-10-25T05:49:26Z"}},"role":"Backend","role_family":"Backend","seniority":"senior","employment_type":"full_time","work_mode":"hybrid","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Dublin, Ireland"],"countries":["IE"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":{"min_usd":95000,"max_usd":197000,"period":"year","method":"role_seniority_country_remote_cell","sample_n":38},"experience_years_min":5,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"ArgoCD","optional":false},{"name":"AWS","optional":false},{"name":"CI/CD","optional":false},{"name":"FastAPI","optional":false},{"name":"Kubernetes","optional":false},{"name":"MySQL","optional":false},{"name":"PostgreSQL","optional":false},{"name":"Python","optional":false},{"name":"GitLab","optional":true},{"name":"Helm","optional":true},{"name":"JavaScript","optional":true},{"name":"Pydantic","optional":true},{"name":"TypeScript","optional":true},{"name":"Uvicorn","optional":true},{"name":"Vite","optional":true}],"status":"closed","first_seen_at":"2026-09-09T15:31:16Z","employer_posted_date":"2026-09-09","last_verified_at":"2026-10-25T02:12:02Z","board_verified":false,"closed_at":"2026-10-25T02:12:02Z","days_open":45,"trust":{"level":"not_scored","repost_count":null,"flags":[],"days_open":45},"description":"At F5, we strive to bring a better digital world to life. Our teams empower organizations across the globe to create, secure, and run applications that enhance how we experience our evolving digital world. We are passionate about cybersecurity, from protecting consumers from fraud to enabling companies to focus on innovation. \nEverything we do centers around people. That means we obsess over how to make the lives of our customers, and their customers, better. And it means we prioritize a diverse F5 community where each individual can thrive.\nRole Summary\nF5 is growing its AI Security team and is looking for an ambitious, versatile, and self-driven Backend Software Engineer. In this role, you will design, develop, test, and maintain scalable backend applications that power world-first AI Security solutions. Your contributions will be crucial to building out our AI Security web application, ensuring robust, reliable, and cutting-edge technology to successfully meet business and customer needs.\nThis role offers an exciting opportunity to collaborate with a multidisciplinary team, solve technically challenging problems, and grow professionally in a culture that values innovation, collaboration, and team excellence.\nTech Stack We Use\nBackend: Python, FastAPI, Pydantic, uvicorn \nFrontend: Typescript, Vue3, Vite \nSource Control: GitLab \nContinuous Delivery: ArgoCD \n Deployment: AWS (Dockerized applications, Helm charts, Kubernetes) \nKey Responsibilities\nBuild and Deliver Exceptional Technology\nDesign, develop, and maintain scalable backend applications, SDKs, and tools to support AI Security solutions at scale. \nCollaborate with the product, QA, frontend, and data science teams to deliver seamless, user-friendly, high-performance software. \nWrite clean, efficient, and maintainable code, adhering to F5’s best practices in software development and secure coding. \nEnsure Quality, Performance, and Architecture\nTest, troubleshoot, and optimize backend services to ensure maximum scalability, performance, and reliability. \nArchitect backend features based on best practices in modern software design and scalable architecture patterns. \nContinuous Improvement and Collaboration\nProactively suggest and implement solutions to challenges encountered during development cycles. \nThrive in a collaborative environment, working cross-functionally to ensure alignment with business and technical goals. \nStay updated with emerging technologies, leveraging new tools and features where appropriate to improve backend systems. \nQualifications and Skills\nRequired Experience\nAt least 5 years’ experience developing server-side applications using Python, FastAPI, or equivalent frameworks. \nStrong understanding of database technology, including platforms like PostgreSQL or MySQL. \nDemonstrated expertise in building, debugging, and maintaining RESTful APIs and multi-service backend systems. \nExcellent troubleshooting skills to debug and analyze complex software systems. \nA passion for owning and delivering high-quality backend solutions that meet business and customer needs. \nCore Skills\nCritical Thinking: Structured problem-solving approach when debugging and troubleshooting multi-service applications. \nCollaboration: Proven ability to work both independently and as part of a larger engineering team. \nCommunication: Clearly communicate ideas, features, and risks to technical and non-technical collaborators. \nTime Management: Ability to prioritize and manage multiple tasks effectively while meeting deadlines. \nPreferred Skills\nFamiliarity with Dockerized applications, Kubernetes, and cloud environments like AWS. \nHands-on experience with testing and delivery pipelines, including automated CI/CD workflows (e.g., ArgoCD). \nKnowledge of secure coding practices and deploying applications in mission-critical production environments. \nWhy Join the F5 AI Security Team?\nAt F5, Backend Engineers are critical to building AI-driven, scalable solutions that deliver empowerment and innovation to customers across the globe. Here’s why you’ll love it here:\nTechnical Excellence: Work with modern technologies and solve unique technical challenges in the rapidly evolving AI Security space. \nImpactful Collaboration: Partner with cross-functional teams to create features that solve meaningful customer problems. \nGrowth Opportunities: Advance your skills and career while contributing directly to world-first AI security innovations. \nSupportive Work Culture: We foster a collaborative team where diverse perspectives and continuous improvement drive our success. \nWhat Success Looks Like\nAs a Backend Software Engineer at F5, success is demonstrated by your ability to:\nDeliver high-quality, scalable backend services that enhance the capabilities of our AI Security products. \nCollaborate seamlessly with cross-functional teams to align engineering solutions with product goals. \nMaintain a growth mindset, adopting modern technologies and improving backend architecture to meet current and future needs. \nTroubleshoot and resolve complex production issues, minimizing downtime and ensuring system reliability. \n#LI-SS5\nThe Job Description is intended to be a general representation of the responsibilities and requirements of the job. However, the description may not be all-inclusive, and responsibilities and requirements are subject to change.\nPlease note that F5 only contacts candidates through F5 email address (ending with @f5.com) or auto email notification from Workday (ending with f5.com ).\nEqual Employment Opportunity\nIt is the policy of F5 to provide equal employment opportunities to all employees and employment applicants without regard to unlawful considerations of race, religion, color, national origin, sex, sexual orientation, gender identity or expression, age, sensory, physical, or mental disability, marital status, veteran or military status, genetic information, or any other classification protected by applicable local, state, or federal laws. This policy applies to all aspects of employment, including, but not limited to, hiring, job assignment, compensation, promotion, benefits, training, discipline, and termination. F5 offers a variety of reasonable accommodations for candidates. Requesting an accommodation is completely voluntary. F5 will assess the need for accommodations in the application process separately from those that may be needed to perform the job. 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