Senior Full-stack Developer

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

• Expertise in JavaScript, Tailwind CSS, Next.js, AWS, and SQL is a must

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$).

Other Options from Lemon.io

NOT YOUR TECH STACK?

We have multiple projects available for Senior Developers. If you have 4+ years of commercial software development experience and are proficient in any of the following areas: React & Node, React & Python, Node & Python, Unreal Engine, Data Engineering, WordPress, Svelte & TypeScript, Svelte & Node, Svelte & Python, Golang, Swift& SwiftUI, Shopify & JavaScript, PHP & Vue, Rust, MLOps, React Native & Node, PHP & Angular, PHP & React, Blockchain, or Data Analysis — we’d be happy to connect and match you with a suitable project.

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
• 30-minute screening call
• 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:

• European: Iceland, Liechtenstein, Kosovo, Belarus, Russia, and Serbia.
• 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.