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Jack & Jill
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Founding Frontend Engineer ($140k-$200k + Equity) at fast-growing tech startup
United Kingdom
· Full-time
·
Mid-Senior
This is a job that we are recruiting for on behalf of one of our customers.
To apply, speak to Jack. He's an AI agent that sends you unmissable jobs and then helps you ace the interview. He'll make sure you are considered for this role, and help you find others if you ask.
Founding Frontend Engineer
Salary: $140k–$200k + Equity
Company Description: Fast-growing early-stage tech startup
Job Description:
Lead frontend development at an early-stage tech startup, shaping the technical architecture and building user-facing products from the ground up. This high-impact, high-ownership role is ideal for an engineer who wants to define both the product and the engineering culture, playing a pivotal role in the company’s success in a fast-paced, 0→1 environment.
Location: London, UK
Why this role is remarkable:
To apply for this job speak to Jack, our AI recruiter.
Step 1. Visit our website
Step 2. Click 'Speak with Jack'.
Step 3. Login with your LinkedIn profile.
Step 4. Talk to Jack for 20 minutes so he can understand your experience and ambitions.
Step 5. If the hiring manager would like to meet you, Jack will make the introduction.
To apply, speak to Jack. He's an AI agent that sends you unmissable jobs and then helps you ace the interview. He'll make sure you are considered for this role, and help you find others if you ask.
Founding Frontend Engineer
Salary: $140k–$200k + Equity
Company Description: Fast-growing early-stage tech startup
Job Description:
Lead frontend development at an early-stage tech startup, shaping the technical architecture and building user-facing products from the ground up. This high-impact, high-ownership role is ideal for an engineer who wants to define both the product and the engineering culture, playing a pivotal role in the company’s success in a fast-paced, 0→1 environment.
Location: London, UK
Why this role is remarkable:
- Shape technical architecture and engineering culture as a founding engineer.
- High-impact role at a well-funded startup building products from 0 to 1.
- Significant equity package with a clear path to future engineering leadership.
- Design and implement scalable frontend architecture, establishing best-in-class engineering practices.
- Collaborate directly with founders and designers to turn product vision into exceptional user experiences.
- Help define engineering culture, participate in hiring, and mentor future frontend engineers.
- 5+ years of frontend development experience using modern JavaScript frameworks (React, Vue, or Angular).
- Experience in early-stage environments (pre-Series A preferred), building products from scratch.
- Deep expertise in HTML5, CSS3, JavaScript/TypeScript, and strong product intuition.
To apply for this job speak to Jack, our AI recruiter.
Step 1. Visit our website
Step 2. Click 'Speak with Jack'.
Step 3. Login with your LinkedIn profile.
Step 4. Talk to Jack for 20 minutes so he can understand your experience and ambitions.
Step 5. If the hiring manager would like to meet you, Jack will make the introduction.
Key Skills
Ranked by relevance
ai
javascript
react
html5
vue
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- Posted
- Dec 08, 2025
- Type
- Full-time
- Level
- Mid-Senior
- Location
- London
- Company
- Jack & Jill
Industries
Technology
Information
Internet
Categories
Engineering
Information Technology
Related Jobs
3 roles aligned with this opportunity
View Job Details
Related
Software Engineer Fullstack (£75k-£110k + Equity) at YC-backed AI-native revenue platform
2026-05-15
Full-time
Not Applicable
United Kingdom
Technology
Engineering
View Job Details
Related
Product Engineer (£70k-£130k + Equity) at LocalGlobe-backed AI-native GTM platform
2026-05-11
Full-time
Not Applicable
United Kingdom
Technology
Engineering
View Job Details
Related
AI Engineer ($100K - $250K + Equity) at Solve Intelligence - YC-backed legal AI
2026-05-11
Full-time
Not Applicable
United Kingdom
Technology
Engineering