Senior Backend Nest.js Engineer

Region: LATAM and/or EMEA

Country: Poland, Ukraine, 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

We are seeking a Senior Nest.js Developer to join our backend development team. In this role, you will design and build scalable backend services using Nest.js, help drive architecture and system improvements, and collaborate closely with frontend, product teams. You will also play a mentoring role for more junior engineers, and contribute to defining best practices around testing, code quality, and deployment.

You’re a perfect match if you have:

Must have

5+ years of professional experience building backend services / APIs, with at least 2+ years working with Nest.js in production.
Deep proficiency in TypeScript; solid understanding of JavaScript core.
Strong design skills in API architecture: REST.
Experience with NoSQL document databases (particularly MongoDB); schema design, query optimization, migrations.
Experience with containerization (Docker) and orchestration.
Experience with Lucene-based search (MongoDB Atlas, Elasticsearch, OpenSearch, or similar).
Experience using vector embeddings and AI API features.
Experience building modular systems / microservices.
Thorough experience with testing (unit, integration, mocks, error paths).
Strong skills in version control (Git), code reviews, and CI/CD pipelines.
Good understanding of cloud deployments (e.g., AWS, Azure, or comparable) and shipping services to production with monitoring, logging, alerting.
Excellent problem-solving skills, ability to debug complex issues in production.
Strong verbal and written communication skills; ability to articulate trade-offs, document work.

Nice to Have

Experience with domain-specific complexities: high-traffic load, data-intensive operations, health or content-heavy applications.
Exposure to streaming, event-driven architecture; experience with related tools like Redis, BullMQ, RabbitMQ, etc.
Experience with GraphQL, WebSocket, or real-time features.
Familiarity with Drupal and PHP.
Experience with SQL databases (MSSQL, MySQL, or similar).
Familiarity with .NET.
Familiarity with multitenant systems.
Familiarity with infrastructure as code (Terraform, CloudFormation, etc.).
Experience with performance tuning, caching strategies, rate limiting, etc.
Previous experience with mentoring / leading small teams

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.

Your day-to-day activities:

Design, build, and maintain backend services/APIs using Nest.js, MongoDB, and TypeScript.
Architect scalable, maintainable, and secure microservices / modular applications.
Collaborate with frontend teams, product managers, and UX to translate requirements into robust endpoints.
Ensure high test coverage: unit, integration, end-to-end tests.
Optimize performance, reliability, and scalability of existing systems.
Participate in code reviews, provide technical feedback and mentor junior engineers.
Work on CI/CD, observability (metrics/logging), deployment, and rollback plans.
Maintain good API documentation and versioning.
Stay up-to-date with backend innovations, security best practices, and apply improvements.
As a Senior team member, you will be expected to actively participate in our hiring processes by serving on interview panels for future roles across the company.

Ready to dive in?

Denise Mecca
Recruiter

America/Argentina/Buenos_Aires

denise.mecca@newfireglobal.com

Hiring Process

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

Stage 1

Applied

Stage 2

Sourced

Stage 3

Recruiter Interview

Stage 4

Code test

Stage 5

Technical Interview

Stage 6

Hiring Manager interview

Stage 7

Final Interview

Stage 8

Offer

Stage 9

Background Check

Stage 10

Hired - Welcome to Newfire!

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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.

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