Senior Software Engineer in Test London, England, United Kingdom London, England, United Kingdom

Axon Enterprise, Inc.; City of Westminster; Hybrid; GBP 125,000 - 150,000; Full time

Job summary

A leading technology company in Westminster seeks a Senior SDET to ensure high-quality software for first responders. You'll architect test infrastructure, implement automation frameworks, and lead initiatives to improve CI/CD processes. We're looking for candidates with 7+ years of experience in test automation and a strong grasp of distributed systems and API testing. The role follows a hybrid schedule, promoting collaboration onsite from Tuesday to Friday and remote work on Mondays.

Benefits

Competitive base salary and RSUs

Comprehensive pension plan with matching contribution

Private health insurance & cash plans

30 days paid holiday + UK public holidays

Enhanced maternity/paternity leave

Life assurance & income protection

Career growth support and wellness resources

Qualifications

• 7+ years of experience in test automation, software engineering, or SDET roles.
• Strong experience building and scaling test automation frameworks and developer-focused tools.
• Deep understanding of distributed systems, API testing, and CI/CD pipelines.
• Hands-on experience testing AI/ML-powered systems, real-time services, or multi-modal UIs.

Responsibilities

• Architect and implement automation frameworks, test strategies, and quality infrastructure.
• Design scalable validation systems for real-time voice interaction and AI features.
• Partner with engineers to shape code for testability.
• Lead quality initiatives to improve CI/CD pipelines and release readiness.
• Drive performance, load, and resilience testing.

Skills

Test automation

Software engineering

Distributed systems

API testing

CI/CD pipelines

AI/ML systems testing

Job description

From body-worn cameras to mobile apps and dispatch tools, Axon Assistant enables first responders to access critical information exactly when they need it. As a Senior SDET, you'll play a pivotal role in ensuring this mission‑critical, intelligent software ships with the highest levels of quality, performance, and trust. You'll architect test infrastructure, lead automation strategy, and own the systems that validate our most advanced multi‑platform experiences.

Responsibilities

• Architect and implement automation frameworks, test strategies, and quality infrastructure across web, mobile, and on‑device platforms.
• Design scalable validation systems for real‑time voice interaction, AI/LLM‑driven features, and distributed cloud services.
• Partner with engineers to shape code for testability and embed quality early in the development process.
• Lead cross‑functional quality initiatives to improve CI/CD pipelines, observability, and release readiness.
• Drive performance, load, and resilience testing, especially for latency‑sensitive, real‑time systems.
• Mentor other SDETs and developers in automation strategy, debugging, and risk mitigation.
• Own root cause analysis for complex, system‑level issues – using telemetry, tracing, and logs.
• Contribute to documentation of tools, architecture, and best practices that scale across teams.

Location

This role is based out of our London office and follows a hybrid schedule. We rely on in‑person collaboration and ask that team members work onsite Tuesdays through Fridays, with the flexibility to work remotely on Mondays, unless there is an approved workplace accommodation. We believe that connection fuels innovation, and our in‑office culture is designed to foster meaningful teamwork, mentorship, and shared success.

Requirements

• 7+ years of experience in test automation, software engineering, or SDET roles.
• Strong experience building and scaling test automation frameworks and developer‑focused tools.
• Deep understanding of distributed systems, API testing, and CI/CD pipelines.
• Hands‑on experience testing AI/ML‑powered systems, real‑time services, or multi‑modal UIs.
• Track record of owning quality strategy and delivery for mission‑critical software in production.

Nice to Have

• Background working in regulated or high‑trust domains like public safety, healthcare, or finance.
• Ability to influence technical direction and raise the bar for engineering quality across teams.

Who you are

• Engineering‑Driven – You bring a software‑first mindset to quality and reliability.
• Strategic Thinker – You balance fast execution with long‑term test infrastructure health.
• Mentor and Collaborator – You help others grow through reviews, pairing, and shared accountability.

Benefits

• Competitive base salary and RSUs
• Comprehensive pension plan with matching contribution
• Private health insurance & cash plans
• 30 days paid holiday + UK public holidays
• Enhanced maternity/paternity leave
• Life assurance & income protection
• Career growth support and wellness resources

Axon's mission is to Protect Life and is committed to the well‑being and safety of its employees as well as Axon's impact on the environment. All Axon employees must be aware of and committed to the appropriate environmental, health, and safety regulations, policies, and procedures. Axon employees are empowered to report safety concerns as they arise and activities potentially impacting the environment.

Don't meet every single requirement? That's ok. At Axon, we Aim Far. We think big with a long‑term view because we want to reinvent the world to be a safer, better place. We are also committed to building diverse teams that reflect the communities we serve.