Lead Product Engineer

Fyxer Inc.

Job Overview

Location

London

Job Type

Full-time

Full Job Description

📋 Description

• Join Fyxer Inc., a rapidly scaling AI company poised to revolutionize modern work by solving the pervasive problem of email overload. We are at an inflection point, having grown from $1M to $30M ARR in the past year with a lean, elite technical team of 12, and we are projecting $100M ARR by the end of 2026. This is a unique opportunity to join a breakout AI team during its most exciting growth phase, working alongside potential co-founders on a product that is already demonstrating significant market traction and user adoption, with users sending 53% of the AI-generated drafts we produce.
• As a Lead Product Engineer, you will be instrumental in shaping the future of our product. We operate with a philosophy of extreme ownership, where engineers are empowered to drive product strategy and execution. This means you will not be confined to traditional engineering roles; instead, you will have significant agency in defining what we build, how we build it, and how it delivers value to our users. You will translate ambiguous problems into clear, high-impact product decisions, leveraging your technical expertise and product intuition without the need for dedicated product managers.
• Our core product is focused on AI-generated email drafts, enhanced by contextual understanding derived from your inbox, meetings, and messages. We are a pure-play applied AI company, not a tool with AI bolted on. Our technical approach involves leveraging state-of-the-art techniques, including fine-tuned open-source models, tool use, and retrieval-augmented generation (RAG). You will be at the forefront of developing and refining these models, ensuring they deliver exceptional performance and user satisfaction.
• This role demands a hands-on approach to building and shipping production software. You will be responsible for owning systems end-to-end, from initial concept and research through to development, deployment, and ongoing optimization. Your work will directly impact the user experience and the company's trajectory. Examples of the impact our engineers have include building entire product features like a product notetaker in six months, developing a human data platform for model training, and leading infrastructure development while also contributing to core product features.
• We foster an environment of rapid iteration and high autonomy. You will be part of a small, elite technical team where collaboration is key, but individual initiative and ownership are paramount. We believe that a focused, high-performing team can achieve more than a larger, less agile one. This intensity means the role is demanding, but it also guarantees accelerated learning and professional growth.
• Your responsibilities will span across critical areas of product development and AI innovation. This includes building and enhancing our core product features, developing scalable infrastructure to support our rapid growth, training and fine-tuning cutting-edge AI models, and contributing to the strategic direction of the product. You will play a vital role in ensuring our product remains at the cutting edge of AI technology and continues to solve real-world problems for our users.
• We are deeply committed to focus and efficiency. To minimize distractions and maximize productivity, we implement company-wide focus time with no meetings scheduled until 3 PM daily. This structure allows for deep work and uninterrupted progress on critical tasks. We are building a company that will be a leader in the AI space, projected to be a $10B+ entity, and your contributions will be central to achieving this ambitious goal.
• This is an opportunity to work on a product that is already validated by the market and is experiencing exponential growth. We are ranked 7th in Andreessen Horowitz’s list of top AI apps, a testament to our product-market fit and the value we deliver. Join us to build something truly impactful, work with exceptional talent, and be rewarded for your contributions in a high-growth, high-ownership environment.

🎯 Requirements

• 5+ years of experience building and shipping production software, with deep expertise in Python or TypeScript and a track record of owning systems end-to-end.
• Hands-on experience with modern AI/ML tooling (LLMs, fine-tuning, RAG, embeddings, distributed training, inference optimisation, etc.) and proven ability to work directly with models in production.
• Strong product intuition and user-centric mindset, able to translate ambiguous problems into simple, high-impact product decisions without product managers.
• Startup-ready mindset: comfortable operating with extreme ownership, rapid iteration, and high autonomy within a small, elite technical team.
• Proven ability to contribute to product strategy and make product decisions independently.
• Experience with cloud infrastructure and deployment pipelines.

🏖️ Benefits

• Highest cash and equity package in London, up to £500k.
• Significant autonomy and agency in product strategy and execution.
• Opportunity to work with a small, elite team of exceptional engineers.
• Accelerated learning and career growth in a high-growth startup environment.
• Company-wide focus time with no meetings until 3 PM daily.
• Direct impact on a rapidly scaling AI product with significant market traction.

Skills & Technologies

Python

TypeScript

Senior

Onsite

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Fyxer Inc.

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About Fyxer Inc.

Fyxer is a technology company that provides a platform for managing and resolving customer support issues. Their service aims to streamline the customer service process by offering tools for ticket management, communication, and analytics. The platform is designed to help businesses improve their customer support efficiency and customer satisfaction. Fyxer focuses on delivering a user-friendly interface and robust features to handle a wide range of support needs. They cater to businesses looking to optimize their customer service operations and build stronger customer relationships through effective issue resolution and communication strategies. Their goal is to empower businesses with the technology to deliver exceptional support experiences.

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