FullStack Developer

Jumpseller; United States; Remote; USD 67,000 - 92,000; Full time

Job summary

Jumpseller is seeking a remote Full-Stack Engineer to join our product-driven team. You will design features, build scalable code, and contribute to AI/ML initiatives for our e-commerce platform.

We value a strong background in Ruby and React, a pragmatic, analytical mindset, and fluency in Portuguese and English. Based in Porto with hybrid/remote flexibility, you will collaborate across international teams to deliver high-impact solutions.

Qualifications

• Master’s in Computer Science, Computer Engineering, or related quantitative field.
• Strong proficiency in backend development using Ruby, coupled with frontend experience in React.
• Hands-on experience or academic focus in AI/Machine Learning, with an interest in building scalable e-commerce solutions.
• Analytical / Maths / Strong Tech Profile.
• Native proficiency in Portuguese and professional working fluency in English.
• Based in Porto, Portugal with hybrid/remote flexibility.
• Team Player; communicative and transparent.
• AI-native mindset: uses AI as a core part of development.
• Interested in developing e-commerce platforms.

Responsibilities

• Write clean, modular, scalable code able to handle millions of records.
• Design features from ground-up based on specs.
• Build automated tests for your code and improve current tests.
• Collaborate with Customer Support to resolve technical issues and improve service.
• Take ownership and work with autonomy.

Skills

Ruby

React

AI/ML interest

Analytical mind

Portuguese

English

Education

MSc in CS / related

Job description

Jumpseller is a SaaS solution for small business to manage their online business. We focus on making e-commerce easier for everyone, so businesses can focus on what they do best: building and selling their products. Today, merchants use the Jumpseller platform to manage every aspect of their online business — from products to orders to customers, selling with an online store, on mobile, on social networks and through different e-commerce channels.

At Jumpseller you will find a startup environment in which your contributions matter and you are enabled to grow professionally. We have 2 offices, one in Porto, Portugal, and another in Santiago, Chile, and our working culture is international. We allwork fully remote.

The role

We are looking for an analytical, product-driven Full-Stack Engineer to join our team. We look for skilled & dedicated people who share our passion for building a product that millions of people use.

You will

• Work in an informal environment, for a global market;
• Strive to write clean, modular, flawless and scalable code responsible to handle millions of records;
• Design new features from ground-up, from a given set of specs;
• Build automated tests for your code while help improving and maintaining our current test set;
• Be in contactwith our Customer Support Team, resolving technical issues and understand how to improve our service;
• Take responsibility, autonomy and ownership of your work.

The Recruitment Process

• We will review all the CVs & Cover Letters received;
• First interviews - lasting 30 minutes. This is an introductory meeting with our People Department, so that you get to know Jumpseller and present yourself;
• Top candidates will be invited to participate in aCase Study. Not more than 4 to 6 invitations will be sent;
• Finally, a last interview - lasting 45 to 60 minutes - to review the resolution Case Study & focus deeper on your main professional project/achievement;
• Offer letter.

Requirements

• Master’s in Computer Science, Computer Engineering, or a related quantitative field;
• Strong proficiency in backend development using Ruby, coupled with frontend experience in React;
• Hands-on experience or academic focus in AI/Machine Learning, with an interest in building scalable e-commerce solutions;
• Analytical / Maths / Strong Tech Profile. Analytical / engineer minded profile;
• Native proficiency in Portuguese and professional working fluency in English (both written and verbal);
• Based in Porto, Portugal. We have a strong preference for candidates in the northern region (hybrid/remote flexibility);
• Team Player;
• AI-native mindset: Uses AI as a core part of the development process, not just as a coding assistant, leveraging multiple parallel agents to build features faster, solve complex problems, and dramatically multiply individual engineering productivity;
• Being communicative, having initiative and being transparent;
• Generally interested in developing e-commerce platforms.