Lemon.io: Senior Full-stack Developer

Location: New York

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

• Video Ask — 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

• Latin America:
  Cuba and Nicaragua
• Most Asian countries and Africa.

We expand and shorten the list of exemptions regularly.

Do you represent a company with engineers who match the description and want to collaborate with us through staff augmentation? Then register here.#J-18808-Ljbffr