Senior Full-Stack Engineer (Ruby on Rails & React) — Argentina

About NextLink Labs

NextLink Labs is a fast growing technology firm focused on helping companies build, scale, and secure their software applications and organizations. We believe that in order for companies, teams, and products to succeed, technology must be utilized effectively and securely. We pride ourselves in helping our clients win in their respective industries.

As a remote-first company with team members spread out all across the country, NextLink Labs continuously works to ensure our work environment is comfortable and collaborative. We also aim to maintain an inclusive work environment where everyone can thrive professionally and live full lives outside of work.

Position Summary

NextLink Labs is seeking a motivated Senior Full-Stack Engineer to join our Custom Software Development consulting team. A successful person in this role will be tasked with building and maintaining web applications for our clients and will also possess a strategic mindset to contribute internally to improving our consulting practice.

Key Responsibilities

As a Senior Full-Stack Engineer, you will build end-to-end features for client applications using Ruby on Rails and React, make pragmatic architecture decisions to alleviate technical debt in legacy applications, and engage in technical conversations with clients to understand their pain points and how best to solve them. Your role will also encompass mentoring junior developers and assisting the team in ongoing efforts to establish internal best practices to elevate our standards of excellence. If you are a self-motivated engineer looking to take ownership of your work, we invite you to join our team at NextLink Labs.

What You'll Do

• Work with other NextLink engineers to architect and implement software solutions

• Communicate directly with clients to give demonstrations and receive feedback

• Review legacy software applications to identify and remediate technical debt

• Work in an agile team environment with weekly stand ups

• Engage in code reviews of your teammates' work

• Contribute to internal NextLink Labs documentation and code templates

• Engage in thought leadership through blog posts, webinars, and other marketing materials

• Assist Sales and Marketing by joining scoping calls and providing technical input

Required Qualifications

• 5+ years of experience building web applications, with strong proficiency in Ruby on Rails and React or equivalent frameworks

• Ability to work independently and take ownership in a variety of software engagements

• Ability to scope individual features and full software projects based on client requests

• Excellent written, verbal, and interpersonal skills with the ability to build buy-in, facilitate compromise, and guide client expectations

• Strong unit-testing and debugging abilities (RSpec/Minitest, Jest/RTL)

• Proficient understanding of version control systems (Git)

• Understanding of accessibility and security compliance

• Understanding of fundamental design principles behind a scalable application

• Experience with APIs (REST/GraphQL), relational databases (PostgreSQL/MySQL), and background jobs (Sidekiq/Active Job)

Nice to Have

• Experienced with DevOps tooling (AWS, Terraform, Docker) and observability platforms (Sentry/Datadog/Grafana)

Why NextLink Labs

• We’re a technical consulting firm that values clarity, ownership, and outcomes

• Competitive salary with bonus structure

• Remote-first culture, flexible work schedule, and autonomy to do your best work.

• Responsibility and autonomy at a growing company

• The opportunity to build something big and exciting