Sr Software Development Engineer
Confirmed on the employer's own hiring board on Nov 3, 2026. First seen by Alion on Nov 3, 2026. F5 scores B on the Alion truth index.
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.
Everything 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.
As a Senior Software Development Engineer bridges software development and quality assurance, writing code to build automated test frameworks, validate complex system architectures, and lead quality strategy across engineering teams.
Core Responsibilities
- AI-Driven Automation Infrastructure: Design, build, and scale end-to-end automated testing frameworks, integrating AI agents for autonomous test generation, maintenance, and self-healing suites.
- Framework Architecture: Develop and maintain scalable test tooling and infrastructure across backend APIs, distributed cloud architectures, and web/mobile interfaces.
- AI & LLM Validation: Establish testing strategies for features powered by Large Language Models (LLMs), focusing on prompt regression, hallucination detection, bias evaluation, and determinism.
- Code & Quality Reviews: Act as a technical subject matter expert (SME) for code hygiene, guiding design reviews, and evaluating testability and architectural health.
- Test Strategy & Coverage: Define and drive test strategies spanning functional, regression, API, performance, load, contract, and chaos/resilience engineering.
- CI/CD Integration: Integrate automated test suites and infrastructure into continuous integration and deployment pipelines (e.g., GitHub Actions, Jenkins, Azure DevOps, GitLab)
- Debugging & Root Cause Analysis: Investigate complex system failures, performance bottlenecks, race conditions, and production issues.
- Cross-Functional Collaboration: Partner with software developers, product managers, and DevOps teams to align acceptance criteria and improve system observability.
- Mentorship: Guide junior and mid-level engineers while advocating for a strong quality-first culture.
Key Requirements & Skills
- Experience: Typically 5 to 9+ years of combined experience in software development, backend engineering, or specialized SDET/test engineering roles.
- Programming Languages: Proficiency in languages such as Python (highly preferred for AI workflows), Java, TypeScript.
- Automation Frameworks: Hands-on experience with modern tools like Playwright, Selenium, Cypress, or TestNG/JUnit.
- Cloud & Distributed Systems: Familiarity with cloud platforms (AWS, GCP, Azure) and containerized or distributed stacks (Docker, Kubernetes, Kafka, Redis, Cassandra).
- Infrastructure & Monitoring: Experience using observability and logging tools (e.g., Grafana, New Relic, Elasticsearch)
The 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.
Please note that F5 only contacts candidates through F5 email address (ending with @f5.com) or auto email notification from Workday (ending with f5.com or@myworkday.com).
Equal Employment Opportunity
It 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. Request by contacting [email protected].