Mid/Senior Backend Engineer

Altar.io (Headquarters: Lisbon, Portugal (Supports Remote))

Backend Node.js Express MongoDB PostgreSQL API Remote Portugal Mid-level Senior Software Engineer Back End Engineer

Company: Altar.io is a custom product and software development house focused on client success. We're a software house that wants its clients (early-stage startups, entrepreneurs) to thrive. We help entrepreneurs and business leaders build and launch innovative custom software solutions, specializing in a lean, user-centric approach, MVP building, dedicated teams, and AI enablement. Team size is ~50 total, ~20 developers.

Role: Seeking Mid-level and Senior Backend Engineers to join our fully remote team based in Portugal. You will work on diverse projects for early-stage startups and entrepreneurs, designing, developing, and maintaining robust server-side applications and APIs using Node.js/Express and MongoDB/PostgreSQL. Our focus is on understanding business needs deeply to deliver impactful software solutions. Visits to our Lisbon office are entirely voluntary.

Responsibilities:
- Design, build, and maintain efficient, reusable, and reliable backend code using Node.js/Express.
- Implement and manage databases, primarily MongoDB and PostgreSQL.
- Develop, test, and integrate RESTful APIs.
- Collaborate effectively with frontend developers, designers, and product managers in an agile environment.
- Contribute actively to the entire product development lifecycle, from ideation to deployment and maintenance.
- Ensure code quality, performance, and scalability of backend systems.

Technical Skills Required:
- Proven experience as a Backend Engineer (Mid or Senior level).
- Strong proficiency in Node.js and the Express framework.
- Solid experience with NoSQL (MongoDB) and/or relational databases (PostgreSQL).
- Good understanding of RESTful API design, development, and best practices.
- Familiarity with version control systems like Git.
- Experience with cloud platforms (AWS, Azure, GCP) is a plus.
- Knowledge of containerization (Docker, Kubernetes) is a plus.

Ideal Candidate:
- Must be based in Portugal or open to relocating.
- Passionate about building high-quality software products for startups.
- Thrives in a collaborative, remote-first environment.
- Possesses a user-centric mindset and strong problem-solving skills.
- Excellent communication skills in English.
- Proactive, self-motivated, and eager to learn new technologies.