Senior Full-Stack Engineer (React / Node.js + Kotlin)

Region: LATAM and EMEA

Country: Poland, Croatia, Costa Rica, Argentina, Colombia, Mexico, and Portugal

Type: Fully remote

What's the Project?

Newfire Global Partners is a leading technology firm that specializes in building transformative software solutions for some of the world’s most innovative companies. With a presence across four continents, Newfire Global brings deep expertise in digital healthcare, AI-driven analytics, and enterprise technology. The firm’s track record of delivering scalable, high-impact solutions has made it a trusted partner for organizations seeking to drive meaningful change through technology.

We are passionate about the purpose-driven mission to help improve the quality of care for patients and are building a collaborative, innovative, and inclusive culture. We are a fully funded company founded by serial entrepreneurs with a stable client base.

Opportunity for impact

Newfire Global Partners, a leader in developing disruptive healthcare technology, collaborates with Fortune 500 companies and start-ups to drive transformation.

We’re seeking a Senior Full-Stack Engineer with strong experience in React and solid backend skills, ideally in Kotlin or Node.js. While the backend is increasingly Kotlin-based, familiarity with Node.js will be helpful for specific services still running in that stack.

The ideal candidate has a strong eye for modern UI/UX implementation and can build, integrate, and optimize scalable APIs and services. Experience with Kotlin — or the willingness to learn it quickly — will be highly valued as the team continues expanding backend components into Kotlin-based microservices.

What's the Project?
Our customer is a fast-growing healthcare technology company building scalable digital solutions that improve patient outcomes and operational efficiency. The team values collaboration, technical excellence, and continuous learning.

You’re a perfect match if you have:

5+ years of professional software development experience.
Strong expertise in React.js, TypeScript, JavaScript (ES6+), and modern frontend tooling (Webpack, Babel, etc.).
Solid hands-on experience in Node.js (Express, Nest.js, or similar frameworks).
Proficiency in HTML5, CSS3, and responsive UI frameworks.
Familiarity with database design and ORM tools (PostgreSQL, MongoDB, Prisma, etc.).
Experience building and integrating APIs (REST/GraphQL).
Strong understanding of software design patterns, scalability, and performance optimization.
Experience with Git-based workflows, CI/CD pipelines, and cloud environments (AWS, GCP, or Azure).
Excellent communication and teamwork skills, with experience working in Agile/Scrum teams.
Intermediate+ English proficiency.

Nice to Have

Experience with Kotlin and Spring Boot (or readiness to learn from Node.js experience).
Familiarity with Nest.js, Next.js, or other server-side rendering frameworks.
Exposure to microservices, message queues, or event-driven architectures.
Understanding of healthcare technology or HIPAA-compliant systems.
Background in accessibility (WCAG) and design systems (Storybook, Figma).

Your day-to-day activities:

Design, develop, and maintain high-quality, scalable web applications using React, Kotlin, and Node.js
Collaborate with product managers, designers, and other engineers to deliver reliable and performant features.
Write clean, testable, and maintainable code across the stack.
Build and consume RESTful and GraphQL APIs.
Participate in architectural discussions and technical design reviews.
Optimize application performance and ensure responsive design across devices.
Support and guide frontend and backend integration within a microservices environment.
Contribute to CI/CD, code reviews, and best development practices.
Mentor other developers and participate actively in Agile ceremonies.

Please note that employment will be contingent upon providing documentation verifying your legal work authorization in the country of residence, in accordance with applicable law.

Ready to dive in?

Leon Dueñas
Recruiter

America/Bogota

guillermo.duenas@newfireglobal.com

Hiring Process

Here's what you can expect during our hiring process.

Stage 1

Applied

Stage 2

Interview

Stage 3

Technical Challenge

Stage 4

Technical Interview

Stage 5

Fit Interview

Stage 6

Client Interview

Stage 7

Offer

1 of X

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Your Country How many years of experience do you have in roles similar to the one you are applying for? *
Please specify only the years of experience relevant to similar positions, not your total professional experience. What is your English proficiency level? *
At Newfire, we only hire professionals who can communicate clearly and effectively with native English speakers in meetings, emails, and chat. Your English skills will be assessed during the initial interview.Basic (A1–A2) – Can understand and use some familiar words and very basic phrases. Very limited ability to communicate. Intermediate (B1) – Can deal with some daily situations. Limited ability to communicate in English. Advanced (B2–C1) – Can interact with a degree of fluency and spontaneity in a professional environment. Able to produce clear, well-structured language on complex subjects. Fluent / Native (C2) – Can express themselves effortlessly in all types of communication, including nuanced and abstract language. Comparable to native-level proficiency. What is your Spanish proficiency level? *
Your Spanish skills will be assessed during the initial interview.Basic (A1–A2) – Can understand and use some familiar words and very basic phrases. Very limited ability to communicate. Intermediate (B1) – Can deal with some daily situations. Limited ability to communicate in English. Advanced (B2–C1) – Can interact with a degree of fluency and spontaneity in a professional environment. Able to produce clear, well-structured language on complex subjects. Fluent / Native (C2) – Can express themselves effortlessly in all types of communication, including nuanced and abstract language. Comparable to native-level proficiency.

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