Senior Full Stack Developer (AI & Automation)

The Opportunity: As a Senior Developer, you’ll have significant autonomy to shape how some of the world’s largest telecom operators communicate with consumers and detect issues across their networks. You’ll help evolve the platform into a proactive, intelligent system built around Observe - Think - Act workflows, designing autonomous, AI‑driven operations that surface insights, trigger actions, and streamline complex network processes at scale. You’ll work across the full stack, building intuitive interfaces in React and architecting resilient Python backend systems capable of handling massive volumes of time‑series telemetry. You’ll join a dynamic, experienced global product and engineering team, collaborating with specialists across mobile SDKs, cloud platforms, and large‑scale distributed systems, while working directly with global customers. If you’re excited by the challenge of building intelligent systems, solving complex data problems, and driving meaningful impact at global scale, this role offers the scope and technical depth to do your best work.

Key Responsibilities:

• Full-Stack Development: Develop and maintain robust, scalable web applications using React, Redux, and modern backend frameworks.
• Modernize Workflows: Move the platform from reactive reporting to proactive operations by implementing "Observe-Think-Act" loops for network outage detection and communication.
• Maintain Technical Quality: Write clean, maintainable, and efficient code while conducting high-signal code reviews to elevate engineering standards.
• Collaborate Cross-Functionally: Work closely with Product teams to translate emerging AI capabilities into high-performance features for our global operator clients.
• AI ‘Features’ Development: Architect and deploy AI native operations, specifically building autonomous systems for complex operational workflows.
• Scale Data Processing: Help maintain and optimize backend services capable of handling high-volume network telemetry and time-series data.

Job Qualifications:

• 5 to 8 years of professional software engineering experience.
• Experience in mentoring or leadership.
• Expert proficiency in Python (FastAPI or Django) and experience designing scalable RESTful APIs.
• Proficient in React and Redux with hands-on experience building complex, data-heavy web applications.
• Hands-on experience using AWS to build and scale web applications, including containerization (Docker/Kubernetes).
• Systems Thinker: Strong ability to break down complex manual problems into deliverable, automated technical sub-tasks.
• PLUS: AI Frameworks: Exposure to tools like LangChain, LangGraph, or LlamaIndex.
• PLUS: Data Privacy: Experience with anonymization techniques and PII protection (GDPR).
• PLUS: Domain Knowledge: Understanding of network monitoring, telecommunications data, or performance testing.

About Ookla: Ookla® is a global leader in connectivity intelligence, offering unparalleled network insights through the combined expertise of Speedtest®, Downdetector®, RootMetrics®, and Ekahau®. Our team is a group of people brought together through passion and inspired by possibility. We are looking for team members who love solving problems, are motivated by challenges, and enjoy turning clever ideas into exceptional products.

Our Benefits: Ookla offers competitive salaries in addition to robust, health and wellness-focused benefits. We are committed to work-life balance with paid time off when you need it. At Ziff Davis, we remain dedicated to creating an environment where everyone feels valued, respected, and empowered to succeed.

Ziff Davis is an Equal Opportunity Employer. At Ziff Davis, Diversity, Equity, and Inclusion (DEI) has always been about fairness, equal opportunity, and belonging.

Compensation Range: Ziff Davis provides a range for the base pay. The salary compensation for this role is £50,000 to £80,000.