Lemon.io: Senior Full-stack Developer

Breakout Tools

New York (NY)

Remote

USD 100,000 - 130,000

Full time

14 days+

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Job summary

A fast-growing tech startup is seeking a Senior Full-Stack Developer for a remote position. This is a great opportunity to work on innovative AI-driven projects. Applicants should have over 5 years of experience with React.js and Node.js, and be open to a fast-paced work environment including weekend work. Responsibilities include developing full-stack applications and collaborating with internal teams. Competitive compensation and the chance to contribute to cutting-edge technology are offered.

Qualifications

5+ years of experience with React.js and Node.js.
Experience with developing full-stack web applications from scratch.
Willingness to work on weekends as required.

Responsibilities

Develop full-stack web applications replicating existing software.
Collaborate with management and technical leads.
Deliver production-ready, scalable solutions using related technologies.

Skills

React.js

Node.js

Next.js

Tailwind

SQL

Redis

Job description

Are you a talented Senior Developer looking for a remote job that lets you show your skills and get decent compensation? Look no further than Lemon.io — the marketplace that connects you with hand‑picked startups in the US and Europe.

Currently, we are seeking a Senior Full‑Stack Developer for our client. It’s a great opportunity, as they are one of the fastest‑growing YC companies. Their investors include Y Combinator and Box Group, and they support leading AI labs. Joining this project offers the chance to play a key role in the AI movement.

Details:

40h / week – very likely a 6‑day work week due to the fast‑paced nature of the project
start date: within 2-3 weeks
Full‑time
within 2-3 weeks
2-3 months with potential to extend to 1‑year engagement.
(GMT -8:00) Pacific Time (US & Canada)

What the Company Does

Develops tools and services for creating high‑precision datasets used to train advanced AI models.
Builds simulated environments and functional prototypes of well‑known digital products (such as communication platforms, CRM systems, productivity tools, financial interfaces) so AI agents can learn to complete real‑world tasks.
Creates internal platforms for data management, quality control, and automation of data generation workflows.
Works on long‑term technologies that help AI systems better understand complex tasks, business logic, and user interfaces.

Requirements

5+ years of experience with React.js and Node.js

TASKS/RESPONSIBILITIES

Develop full‑stack web applications from the scratch, replicating existing enterprise software.
Collaborate with internal management and technical leads.
Participate in a take‑home assessment and interviews as part of the selection process.
Deliver production‑ready, scalable solutions using Next.js, Tailwind, SQL/Redis, and related technologies.

IDEAL PROFILE

You have a diverse skillset and are open to learning new technologies.
You have strong experience building stuff from scratch.
Your background includes products that are used and loved by many; working at big companies or popular startups is a big bonus.

IMPORTANT

You are open to weekend work. It’s likely going to be a 6‑day work week regularly.
You are open to completing a test task for this project, which will take roughly 10 hours and will be compensated (500$).

If your experience matches our requirements, be ready for the next steps

VideoAsk — watch a short video about our startup, up to 10 minutes
Complete your profile on our website
Technical interview
Feedback
Magic Box (we are looking for the best project for you).

P.S. We work with developers from 50+ countries in different regions: Europe, LATAM, Asia (Philippines, Indonesia), Oceania (Australia, New Zealand, Papua New Guinea), Canada, and the UK. However, we have some exceptions.

At the moment, we don’t have a legal basis to accept applicants from the following countries