Senior Software Engineer II

National Society for Black Engineers; City Of London; Hybrid; GBP 80,000 - 100,000; Full time

Job summary

A technology company in London is seeking a Senior Software Engineer II to develop scalable backend systems that enhance public safety technologies. You will collaborate with various teams and contribute to architectural decisions. The ideal candidate has over 9 years of experience in software development, particularly in backend services. This position follows a hybrid work schedule, requiring in-person attendance from Tuesday to Friday.

Benefits

Competitive base salary and RSUs

Comprehensive pension plan with matching contribution

Private health insurance

30 days paid holiday

Enhanced maternity/paternity leave

GymPass subscription

Life assurance

Qualifications

• 9+ years of professional software development experience.
• Strong knowledge of REST APIs and distributed system design.
• Experience with SQL and NoSQL data stores.

Responsibilities

• Design and build scalable backend services for real-time AI experiences.
• Collaborate with teams to integrate AI into production systems.
• Mentor and support other engineers.

Skills

Backend service development

Node.js

Python

System design

Performance optimization

Education

Bachelor's degree in Computer Science or related field

Tools

AWS

Azure

GCP

Job description

Overview

Join Axon and be a Force for Good. At Axon, we're on a mission to Protect Life. We're explorers, pursuing society's most critical safety and justice issues with our ecosystem of devices and cloud software. Like our products, we work better together. We connect with candor and care, seeking out diverse perspectives from our customers, communities and each other.

Life at Axon is fast-paced, challenging and meaningful. Here, you'll take ownership and drive real change. Constantly grow as you work hard for a mission that matters at a company where you matter.

Your Impact

Axon is on a mission to protect life. As part of that mission, Axon Assistant is changing how public safety professionals interact with technology - delivering real-time translation, policy guidance, and AI-driven support across voice, mobile, and web platforms. It's a product that demands reliability, speed, and clarity - in the moments when it matters most.

As a Senior Software Engineer II, you'ill central role in building the backend systems that bring Axon Assistant to life. You'ill work across real-time APIs, LLM-integrated services, and edge-to-cloud pipelines to help first responders get intelligent, actionable support exactly when they need it.

You'ill contribute to architectural decisions, mentor other engineers, and help us scale a product that will operate globally and in high-stakes environments.

You're someone who loves writing clean, scalable services - but who also thrives in ambiguity and is motivated by solving problems that don't yet have clear answers. You care about system design, performance, and shipping features that support real people doing critical work. And you bring enough experience to know when to challenge, when to align, and how to build software that lasts.

Work 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.

What You’ll Do

• Design and build scalable, fault-tolerant backend services that support real-time AI experiences across Axon devices, mobile apps, and web interfaces.
• Collaborate with Applied AI teams to integrate large language models and related services into production systems - with a focus on latency, reliability, and observability.
• Contribute to and lead architecture discussions, including model orchestration, caching strategies, data storage patterns, and compute optimization.
• Write production code (Node.js, Python, or similar), review pull requests, and promote engineering best practices across the team.
• Collaborate cross-functionally with product, design, and client teams to deliver intelligent, usable features on a fast-moving roadmap.
• Improve how we operate: help shape sprint rituals, incident response, system monitoring, and long-term platform health.
• Mentor and support other engineers, helping grow a strong engineering culture built on trust, ownership, and execution.

What You Bring

Required Skills

• Bachelor\'s degree in Computer Science, Engineering, or a related field.
• 9+ years of professional software development experience, ideally in backend or platform teams.
• Strong proficiency in backend service development in Node.js, Python, Go, or similar languages.
• Experience designing and operating cloud-native systems (AWS, Azure, or GCP) with a focus on scalability and resilience.
• Familiarity with AI/ML systems, or demonstrable ability to quickly ramp up in highly technical, ambiguous domains.
• Strong knowledge of REST APIs, distributed system design, and performance optimization.
• Experience with both SQL and NoSQL data stores, caching layers, and observability tooling (e.g., Prometheus, Datadog).

Nice To Have

• Experience deploying or integrating LLMs or NLP models in production systems.
• Comfortable balancing short-term execution with long-term architectural thinking.
• Passion for building highly-available systems that power mission-critical experiences.
• Interest in or exposure to real-time systems, edge computing, or high-trust user domains (e.g. healthcare, defense, finance).

Benefits that benefit you

• 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
• GymPass subscription
• Life assurance & income protection
• Career growth support and wellness resources

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.

Some roles may also require legal eligibility to work in a firearms environment.

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.

We are an equal opportunity employer that promotes justice, advances equity, values diversity and fosters inclusion. We''re committed to hiring the best talent - regardless of race, creed, color, ancestry, religion, sex (including pregnancy), national origin, sexual orientation, age, citizenship status, marital status, disability, gender identity, genetic information, veteran status, or any other characteristic protected by applicable laws, regulations and ordinances - and empowering all of our employees so they can do their best work. If you have a disability or special need that requires assistance or accommodation during the application or the recruiting process, please email [e-mail].

Please note that this email address is for accommodation purposes only. Axon will not respond to inquiries for other purposes.

Important Notes

The above job description is not intended as, nor should it be construed as, exhaustive of all duties, responsibilities, skills, efforts, or working conditions associated with this job. The job description may change or be supplemented at any time in accordance with business needs and conditions. Some roles may also require legal eligibility to work in a firearms environment. 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. We are an equal opportunity employer that promotes justice, advances equity, values diversity and fosters inclusion. We''re committed to hiring the best talent - regardless of race, creed, color, ancestry, religion, sex (including pregnancy), national origin, sexual orientation, age, citizenship status, marital status, disability, gender identity, genetic information, veteran status, or any other characteristic protected by applicable laws, regulations and ordinances - and empowering all of our employees so they can do their best work. If you have a disability or special need that requires assistance or accommodation during the application or the recruiting process, please email [e-mail]. Please note that this email address is for accommodation purposes only. Axon will not respond to inquiries for other purposes.