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Principal Machine Learning Engineer

Likely evergreen RemoteAPAC, North America, UKFull-timePrincipal

Principal ML Engineer building AI-native productivity apps for tasks and workflows. Responsible for the end-to-end ML lifecycle, including training pipelines, evaluation systems, and high-performance GPU inference using Python, PyTorch, or JAX. Focuses on turning research into reliable, scalable production systems for long-running workflows.

AI Data Pipelines Fine Tuning GPU JAX +3 skills

Lead Engineer, Machine Learning

Open 60d HybridAPAC, North America, UKFull-timeLead

The Lead Engineer, Machine Learning will build and scale production-ready AI systems, managing the full model lifecycle from training to deployment. The role focuses on creating reliable, high-performance inference systems using Python, PyTorch, and JAX to power proactive, AI-native applications.

AI Data Pipelines Fine Tuning GPU JAX +3 skills

Staff Machine Learning Engineer

Open 72d RemoteAPAC, North America, UKFull-timeStaff

Staff ML Engineer owning the end-to-end ML execution layer at an AI-native productivity startup — building training/fine-tuning pipelines, evaluation systems, and high-performance GPU inference to turn large models into reliable production systems for proactive everyday apps (email, notes, tasks, calendar). Stack: Python, PyTorch/JAX, GPU infra.

AI Data Pipelines Fine Tuning GPU JAX +3 skills

Interaction Designer, HCI

Open 132d HybridAPAC, North America, UKFull-time

ActAI is hiring an HCI interaction designer to define how users interact with its AI-native proactive apps - the gestures, states, flows, and human-in-the-loop controls for AI-driven tasks. Day to day the designer creates interaction specs and Figma prototypes, works with product and ML teams, and tests designs with real users.

AI Figma Interaction Design Machine Learning Prototyping

Product Designer (UX), HCI

Open 65d RemoteAPAC, Europe, North America, UKFull-time

Design HCI interfaces for an AI-native proactive assistant, defining new interaction patterns for how users guide, review, and trust multi-step AI workflows using Figma.

AI Design Patterns Figma Interaction Design Machine Learning +3 skills

Lead UX Designer

Open 87d HybridAPAC, Europe, North America, UKFull-timeLead

Designs polished, intuitive interfaces for an AI-native smart assistant, building UI components and refining visual systems in Figma.

AI Figma Typography

Motion Designer (UX/Interface)

Open 132d HybridAPAC, North AmericaFull-time

A Motion Designer at ActAI in New York creates interface animation for AI-native productivity apps — designing loading, streaming, progress, and uncertainty states so users intuitively understand what the AI is doing. Core tools include After Effects, Lottie, and Rive, working closely with product designers and engineers.

Accessibility AI Lottie Motion Design

UX Designer

Open 87d HybridAPAC, Europe, North America, UKFull-time

Design the UX for an AI assistant app across iOS, Android, and web, mapping flows for intent capture, progress tracking, and error recovery in a system that handles multi-step reasoning and external tool interactions.

AI Android Figma iOS Machine Learning +4 skills

Lead Software Engineer, AI Email App

Open 60d RemoteAPAC, North America, UKFull-timeLead

Lead Software Engineer for an AI-native email app, owning architecture across backend, mobile, and desktop while leading a small senior engineering team to turn AI/LLM capabilities into reliable, shippable product experiences.

AI API LLM Machine Learning Observability

Principal Software Engineer, AI Email App

Open 60d RemoteAPAC, North America, UKFull-timePrincipal

The Principal Software Engineer will lead a team to build a reliable, AI-native email application by designing backend and client-side architectures that integrate LLM capabilities. This hands-on role involves managing complex workflows, ensuring system reliability, and partnering with ML leadership to deliver a high-quality product.

AI API LLM Machine Learning Observability

Staff Software Engineer, AI Email App

Open 60d RemoteAPAC, North America, UKFull-timeStaff

Staff engineer owning the engineering layer for an AI-native email/app product, designing reliable backend systems, APIs, and client apps that integrate with ML/LLM capabilities while leading a small senior team.

AI API LLM Machine Learning Observability

iOS Software Engineer

Open 60d RemoteAPAC, Europe, North America, UKFull-time

iOS Software Engineer building AI-native iOS apps with Swift and SwiftUI, focused on AI interaction UX patterns, streaming responses, performance optimization, and on-device inference.

AI API Api Design iOS Machine Learning +6 skills

Software Engineer, Desktop

Likely evergreen RemoteAPAC, North America, UKFull-time

Owns ActAI's desktop applications for its AI-native productivity product, building and maintaining cross-platform Electron apps with real-time collaboration UIs, native desktop integrations, and AI features via backend APIs. Core stack: Electron, Node.js, TypeScript, React, local storage (SQLite/IndexedDB), and WebSockets, with a focus on performance and reliability.

AI API JavaScript macOS Node.js +6 skills

Entrepreneur in Residence

Likely evergreen HybridAPAC, Europe, North America, UKFull-time

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…

Full Stack Engineer, AI systems

Likely evergreen HybridAPAC, Europe, North AmericaFull-time

Build AI-native workflows that handle multi-step tasks, integrate LLMs with tools, and ensure reliable, real-time interactions for a proactive smart assistant.

AI Anthropic API Docker Kubernetes +10 skills

Strategy & Operations Associate

Likely evergreen HybridAPAC, Europe, North America, UKFull-time

Strategy & Operations Associate drives high-impact initiatives across business functions, solving challenges and building new capabilities in a fast-moving AI-native product company.

AI Business Development Stakeholder Management

Founder's Office Lead

Likely evergreen HybridAPAC, Europe, North America, UKFull-timeLead

Lead the highest-impact initiatives across a small AI startup building a proactive smart assistant that brings intelligence to everyday workflows. You'll work closely with leadership on engineering, product, hiring, operations, and business development, driving execution and solving new challenges as the company grows. Core focus on AI-native products, multi-step reasoning, and real-world task com

AI Business Development Stakeholder Management

Lead, Special Projects

Open 126d HybridAPAC, EuropeFull-timeLead

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…

Head of Strategy and Product

Open 112d HybridAPAC, Europe, North America, UKFull-timeC-level

Leads strategy and product development for an AI-native smart assistant, driving cross-functional initiatives across engineering, hiring, and operations.

AI Business Development Stakeholder Management

Founder's Associate

Likely evergreen HybridAPAC, Europe, North AmericaFull-time

Founder's Associate drives high-impact initiatives across engineering, product, hiring, and business development at an AI-native startup building a proactive smart assistant for everyday tasks.

AI Business Development Stakeholder Management