Scrumlaunch
Senior Full-Stack Engineer (Ruby & Next.js) (US)

#435 Senior Full-Stack Engineer (Ruby & Next.js) (US)

USA • 5-7 years of experience • Full-time, Remote work • English - Proficiency (C2)

Description

We are looking for a Senior Full-Stack Engineer with deep expertise in Ruby (Ruby on Rails) and Next.js / React to join our team. In this role, you will lead the architecture and implementation of scalable, high-performance web applications, bridging modern backend architecture with fast, responsive frontend experiences.

This is a primarily remote role across the US, but because we host periodic in-person team building sessions and collaborative offsites, proximity to our hubs in New York City (NYC) or Los Angeles (LA) is highly preferred.

Key Responsibilities

• Full-Stack Architecture: Design, build, and maintain scalable web applications using Ruby on Rails for robust API/backend systems and Next.js for modern, high-performance user interfaces.
• Frontend Excellence: Leverage modern Next.js features (App Router, Server-Side Rendering, Server Actions) and React patterns to deliver intuitive, high-speed UX.
• Backend & Database Management: Write clean, modular, and well-tested Ruby code. Optimize database queries (PostgreSQL / Redis) and handle asynchronous background processes.
• System Performance: Ensure high availability, microservices/API integration, and low-latency response times across the stack.
• Technical Leadership: Conduct code reviews, mentor team members, and partner with product managers and designers to drive architectural decisions.

Required Qualifications (Must-Haves)

• Experience: 5+ years of professional software engineering experience, with at least 3+ years in a Senior Full-Stack capacity.
• Core Stack Proficiency:
  • Backend: Strong, hands-on expertise in Ruby on Rails (REST/GraphQL APIs, Active Record, Sidekiq).
  • Frontend: Advanced mastery of Next.js and React (TypeScript experience is a strong plus).
• Database & Cloud: Strong knowledge of relational databases (PostgreSQL) and cloud infrastructure/deployments (AWS, GCP, Heroku, or Vercel).
• Architectural Acumen: Proven track record of designing scalable full-stack applications, handling data modeling, and optimizing web performance.
• Location & Availability: Based in the United States, ideally within commuting distance of NYC or LA for occasional in-person offsites and team gatherings.

Preferred Qualifications (Nice-to-Haves)

• Proficiency with TypeScript in Next.js applications.
• Experience with caching layers, message queues, and background processing (Redis, RabbitMQ).
• Familiarity with CI/CD pipelines, containerization (Docker), and automated testing frameworks (RSpec, Jest, Cypress).
• Prior experience working in fast-paced startup or scale-up environments.

Cooperation terms

• B2B cooperation under a Consulting Agreement
• 12 days of Paid Time Off per year
• 5 days of Medical Time Off per year
• 3 paid holidays per year
• Online Wellness & Psychologist Consultations
• Professional Development Budget — courses and conferences
• English lessons

ScrumLaunch is an award winning US-based software development company. We work with both high growth startups and major corporations on building cutting edge software across many industries. If you are interested in working with smart people on innovative technology, please apply!

FULL TIME