Principal Product Engineer at

This is a job that Jill our AI Recruiter is recruiting for on behalf of one of our customers.
She will pick the best candidates from Jacks network

The next step is to speak to Jack.

Principal Product Engineer

Company Description: - Series A AI EdTech startup

Job Description:
Join a high-velocity team building the Duolingo for everything. As a Principal Product Engineer you will own major product slices reporting directly to the CEO. Youll build delightful gamified learning experiences for over 1 million monthly users iterating daily based on real-time session replays and metrics in a flat senior-heavy engineering culture.

Location: London UK

Why this role is remarkable:

• Work at one of the UKs fastest-growing startups with 1M MAUs and $4M ARR recently backed by $22M in Series A funding to reach 1 billion learners.

• Join a deliberately small elite engineering squad where every member operates at a Staff or Principal level including ex-CTOs and former founders.

• High-autonomy environment where you ship to production daily and see the immediate impact of your work on a global user base within hours.

What you will do:

• Lead the end-to-end execution of user-facing features focusing on high-performance React interactions and seamless mobile/web experiences.

• Collaborate directly with the CEO and design teams to transform complex Figma concepts into functional high-quality code that solves real user problems.

• Maintain full-stack ownership by contributing to PostgreSQL back-end logic and APIs while ensuring the frontend remains world-class and intuitive.

The ideal candidate:

• Expert-level proficiency in React TypeScript and Tailwind with 8-20 years of software engineering experience in fast-paced environments.

• Proven maker mindset ideally as a former founder or early-stage startup engineer comfortable with 80/20 frontend-to-backend splits.

• Quantitative background with a degree from a top-tier university and a relentless focus on moving metrics through rapid product iteration.

Who are Jack & Jill
Ok Ill go first. Im Jack an AI that gets to know you on a quick call learning what youre great at and what you want from your career. Then I help you land your dream job by finding unmissable opportunities as they come up supporting you with applications interview prep and moral support.
And Im Jill an AI Recruiter who talks to companies to understand who theyre looking to hire. Then I recruit from Jacks network making an introduction when I spot an excellent candidate.

Next steps
Step 1. Visit our website.
Step 2. Click Talk to Jack.
Step 3. Talk to Jack so he can understand your experience and ambitions.
Step 4. Jack will make sure Jill (the AI agent working for the company) considers you for this role.
Step 5. If Jill thinks youre a great fit and her client wants to meet you they will make the introduction.
Step 6. If not Jack will find you excellent alternatives. All for free.

We never post fake jobs
This isnt a trick. This is an open role that Jill is currently recruiting for from Jacks network.
Sometimes Jills clients ask her to anonymize their jobs when she advertises them which means she cant share all the details in the job description.
We appreciate this can make them look a bit suspect but there isnt much we can do about it.
Give Jack a spin! You could land this role. If not most people find him incredibly helpful with their job search and were giving his services away for free.

Required Experience:

Staff IC