Senior Full-Stack Engineer - RoR, Next.js & Growth (LATAM)

X-Team International; United States; Remote; USD 120,000 - 180,000; Full time

Benefits offered by this job

Flexible schedules

Wellness stipends

Support for professional and personal成

Job summary

X-Team International is seeking a Senior Full-Stack Engineer for a fully remote, contractor role serving a global nutrition and fitness platform. You will own high-impact web features from Next.js and Node.js microservices, while interfacing with Rails components.

The role emphasizes web growth, SEO, and rapid delivery with AI-assisted workflows. Ideal candidates have senior experience in full-stack development, strong data modeling across SQL/NoSQL, and a collaborative mindset to thrive in

Qualifications

• Senior-level commercial experience developing full-stack web applications with Node.js and Next.js.
• Self-starter autonomy and the ability to own features in a cross-functional squad.
• Experience collaborating with design assets and systems in Figma.
• Strong data modeling across relational (MySQL) and NoSQL/caching layers (MongoDB, DynamoDB, Redis).
• Familiarity with Rails backends is a plus (legacy).

Responsibilities

• Architect, build, and optimize high-converting web features, landing pages, and flows for growth and SEO using Next.js and Node.js services.
• Develop end-to-end features spanning Next.js frontends, Node.js middle-tier services, and Rails backends with REST and GraphQL APIs.
• Model and query data efficiently across MySQL, MongoDB, DynamoDB, and Redis caching layers.
• Integrate AI tools like Claude into daily coding, refactoring, and test generation workflows.
• Contribute to sprint planning, refactoring, and deployment activities while maintaining code quality and ownership.

Skills

Full-stack web dev (Node.js & Next.js)

Autonomy & self-motivation

Cross-functional collaboration

Figma collaboration

SQL & NoSQL databases (MySQL, MongoDB,

Tools

Next.js

Node.js

Ruby on Rails

REST APIs

GraphQL

MySQL

MongoDB

DynamoDB

Redis

Figma

Job description

TypeScript

Next.js

Node.js

Work fully remote, globally

Join a team spread across the world and enjoy true location freedom while collaborating with talented engineers everywhere.

Work with top brands

Riot Games, Fox, Coinbase, Epic Games, and so much more.

Gamified community you’ll love

Engage in online events, compete in challenges, and attend Outposts and summits that bring X-Teamers together learning, connecting, and leveling up globally.

• Enjoy flexible schedules
• wellness stipends
• support to make sure you’re thriving both professionally and personally

About the Role

This is a contractor position through X-Team. We are seeking a Senior Full-Stack Engineer on behalf of a top global nutrition and fitness tracking platform used by millions of users worldwide to log daily health metrics. Over the next two quarters, the team is aggressively investing in web growth, SEO performance, and new user acquisition. In this role, you will join the web growth team working alongside a Staff Web Engineer within a cross-functional squad (QA, Mobile, Backend, Product). You will own critical feature launches across Next.js and Node.js microservices (along with some legacy Ruby on Rails components), architecting high-converting web experiences, refactoring technical debt, and leveraging AI tools like Claude to drive daily development velocity and support aggressive web growth and SEO initiatives.

Key Responsibilities

• Architect, build, and optimize high-converting web features, landing pages, and web flows targeting web growth and SEO performance using Next.js and Node.js services.
• Develop end-to-end features spanning Next.js frontends, Node.js middle-tier services, and Rails backends powered by REST and GraphQL APIs.
• Model and query data efficiently across MySQL, MongoDB, DynamoDB, and Redis caching layers.
• Integrate AI tools like Claude into daily coding, refactoring, and test generation workflows to maintain high delivery speed.
• Contribute to sprint planning, technical debt refactoring, and deployment activities while maintaining code quality and personal ownership.

Must Have

• Core Experience: Senior-level commercial experience developing full-stack web applications using Node.js and Next.js.
• Database Stack: Strong experience modeling and querying data across relational (MySQL) and NoSQL/Caching layers (MongoDB, DynamoDB, Redis).
• Mindset & Way of Working: Self-starter autonomy, a generalist mindset, strong personal quality ownership, and high adaptability in cross-functional squad environments.
• Design Collaboration: Experience working with design assets and systems in Figma.
• Logistics: Remote position based in LATAM with strong working hours overlap with US time zones.

Nice to Have

• Experience or familiarity with Ruby on Rails (legacy technology; not a hard requirement).
• Background in SEO optimization and user acquisition growth strategies.
• Experience collaborating closely with mobile, backend, and dedicated QA teams in a cross-functional setup.

Our Hiring Process

May change based on various factors (role, profile completeness, etc).

• Initial Interview

  Our recruitment team will review your application and contact you if they'd like to proceed with an initial interview.

  Duration: ~ 1 week

• Skills Assessment

  After a successful initial interview, the next step will be an assessment of your technical skills in order to build an ‘X-Profile’ that we can share with the relevant partner.

  Duration: ~ 1 week

• Interview with Our Partner

  We’ll schedule an interview for you to meet our partner, during which you’ll get to know more details about the specific role you have been matched with.

  Duration: ~ 1 week

FAQ

X-Team is committed to providing the ultimate work experience for engineers.

Do you provide paid vacation?

X-Team doesn’t offer paid vacation time, but can arrange for vacation time. We encourage you to incorporate vacation time, health insurance, etc... into your hourly rate.

Will I be working full-time or part-time hours?

At X-Team, we only hire people who can fully dedicate themselves to a project. That means a standard 40 hours per week, Monday through Friday.

Do I need to take care of my own taxes?

Yes. Because we hire you as a full-time contractor, you’ll need to take care of your own taxes. If this is your first time doing so, we recommend you get the advice of a qualified tax advisor to understand the requirements of your country.