Senior Full Stack Engineer

Ersilia; Barcelona; Hybrid; EUR 70,000 - 110,000; Full time

Job summary

Ersilia, based in Barcelona, is seeking a Senior Full Stack Engineer to design, build, and own product features across frontend and backend systems. You will collaborate with tech leadership and cross-functional teams to deliver high-quality software used by customers daily.

The role emphasizes delivery, quality, and collaboration, with an opportunity to influence technical decisions and work across React, Node.js, Typescript, PostgreSQL, and AWS.

Qualifications

• 4+ years of experience building production web applications.
• Strong experience with React, Node.js, and Typescript.
• Solid knowledge of relational databases (PostgreSQL).
• Experience across the full product lifecycle.
• Ability to work autonomously and in a team.
• English fluency; Spanish is a plus.

Responsibilities

• Design, build, and maintain fullstack features across products.
• Collaborate with Product and Design to translate requirements.
• Ensure code quality through testing, reviews, and best practices.
• Contribute to technical discussions and codebase improvements.
• Deliver high-quality software used by customers daily.

Skills

React

Node.js

Typescript

PostgreSQL

AWS

Fullstack development

Team collaboration

English + Spanish

Job description

The Senior Full Stack Engineer will build and own product features

working closely with the tech leadership. You will contribute to both frontend and backend systems, helping ship high quality software that is used daily by customers.

This role is focused on delivery, quality and collaboration with the ability to influence technical decisions.

Your responsibilities:

• Design, build, and maintain fullstack features across the products
• Work with React on the frontend and Node.js on the backend
• Collaborate closely with Product and Design to turn requirements into solutions
• Ensure code quality through testing, reviews and best practices
• Contribute to technical discussions and propose improvements to the codebase

What we are looking for:

• Strong experience building production web applications
• Minimum 4 years experience with React, Node.js and Typescript
• Good understanding of relational databases (PostgreSQL or similar)
• Experience working across the full product lifecycle
• Ability to work autonomously
• Advanced level English plus Spanish would be advantageous

Tech Stack: Typescript, NodeJs, React, PostgreSQL and AWS

Based in Barcelona along with a hybrid working model