Senior Software Engineer, Agentic Harness Quality and Performance

• Be visionary, strategic, and open to innovation

• Work in service of our users, always improving and pushing higher

• Take responsibility with bold decision-making and bias for action

• Be trusting and collaborative while empowering others

• Never stop learning and iterate fast

• Share ideas and practice enthusiasm and joy

• Empathetic, inquisitive, practical

You join Paddington, our AI-native product line inside Goodnotes, and work directly with Steven, our founder, and a small team shipping new products. Engineers own the full cycle: they design, build, test, ship, and operate what they ship. Coding agents write the code, and the engineer who merges it owns what lands.

You set up our quality practice. You build the agentic harness, the guides and automated checks around those agents, and you teach engineers to extend it. You are a software engineer who cares about quality. You lead the quality domain across the squads as an individual contributor and report to the Engineering Manager. We hire at Senior level and welcome Staff-level candidates.

• This role will be required to work on-site, 5 days per week in our London Paddington office

• This is a permanent role

• This role does not include visa sponsorship

• You built LLM-as-judge checks or eval suites for AI product output.

• You wrote architecture fitness functions for performance, security, or observability.

• You know web, desktop, or mobile test tools, iOS and Android in particular.

• You worked on a full-cycle team and operated what you built.

• Talent Intro Call: A conversation with our Talent Acquisition team to dive into your experience, what motivates you, and why you're interested in joining Goodnotes.

• Technical Pre-screen: A short Software Engineering-focused online rapid-fire questions round. 

• Role-Specific Assessment: A live session in our London Paddington office, focused on the core technical skills for this role. You use your own coding agent on a hands-on exercise, then talk through how you would design the harness. This is your chance to show us how you tackle real-world challenges.

• Hiring Manager Interview: A deeper dive into your professional background, your preferred ways of working, and the specific impact you'll have within the team.

• Values-Based Panel Interview: A conversation with 2-3 team members centred on our company values. We'll discuss past experiences to see how your approach aligns with our culture.

• AI Literacy: As an AI-first company, we'll meet with one of our AI champions to discuss your curiosity, understanding, and practical use of AI tools in your daily workflow.

• Customized Growth & Wellness Budgets: We provide dedicated stipends for the things that keep you at your best, including noise-cancelling headphones for deep focus, professional training, personal development, and health and wellness activities.

• Global Connectivity: While we embrace flexible work, we love seeing each other. We provide sponsored visits to our beautiful office locations to foster face-to-face collaboration.

• Company-Wide Offsites: Once a year, we gather the entire global team in person to celebrate our wins, align on our vision, and build lasting connections.

• Comprehensive Health Coverage: Your well-being is our priority. We offer premium medical insurance for you and a dependent to ensure peace of mind for you and your family.

• 24 remote working days per year: Giving you the freedom to work from a location that suits your life. Whether that's closer to family, while travelling, or simply a change of scenery to refresh your focus.