Full Stack Engineer, AI Internal Systems

About ActAI There are over 5 billion users using basic applications today such email, notes, tasks, calendar and they're not AI-native. Our mission is to build proactive applications for anyone in the world, who are not used to complex prompting. We aim to bring intelligence to conversations, errands, organising and workflows, with minimal to no prompting. Our first application is an agent-first mobile communication app. We believe building applications that users use daily for communication, coordination and collaboration needs will help integrate AI into their lives. The net effect is to eliminate misinformation, achieve low coordination costs, enable high quality tasks and collaboration at scale with minimal or little prompting. About the Role We are building AI-powered internal systems to transform how A1 operates. You will be responsible for identifying opportunities across areas such as People, Finance, Operations, Recruiting, and business workflows, and building AI solutions that improve efficiency, automate repetitive processes, and enable better decision-making. What You Will Do Build AI-powered internal tools and systems from concept to production

Identify opportunities where AI can improve internal workflows and operations

Design and implement intelligent workflows, automations, and integrations

Translate business needs into practical product and technical solutions

Work closely with teams across A1 to understand problems and deliver impactful solutions

Own end-to-end execution, from idea generation to deployment and iteration

What You Will Need Experience with backend, full-stack, or platform development

Strong programming fundamentals

Experience with APIs, databases, cloud infrastructure, and AI integrations is a plus

Strong ownership mindset and ability to solve ambiguous problems

Experience building and shipping production software, AI applications, or automation systems

Strong technical foundation and problem-solving ability

Comfortable working independently in a fast-paced startup environment

Ability to communicate effectively with both technical and non-technical teams

How We Work We operate as a small, senior, hands-on team. Engineers own features end-to-end — from design discussion through production monitoring. Code reviews and design reviews are expected for all meaningful changes. We discuss architecture openly, make decisions quickly, and ship frequently. Interview process If there appears to be a fit, we'll reach out to schedule 3, but no more than 4 interviews. Applications are evaluated by our technical team members. Interviews will be conducted via virtual meetings and/or onsite. We value transparency and efficiency, so expect a prompt decision. If you've demonstrated the exceptional skills and mindset we're looking for, the process to offer may be shorter.