Hey! I'm Sergio, Full Stack application developer.

Full-stack developer with expertise in React and Node.js, passionate about crafting efficient and scalable web applications. With 7+ years of professional experience, I have built diverse, user-focused software solutions.

Main tech stack

Frontend

React
TypeScript
Tailwind CSS
HTML
CSS
Jest
JavaScript

Backend

Node.js
Express
PostgreSQL
AWS
GitLab

Skills

Communication
Technical Analysis
Scrum
Adaptability

Extra technologies

Elixir
Redux
PHP
Next.js
Phoenix

Where I've worked

Fullstack Consultant, Relex

Helsinki, Finland | 2024-01-01 - Present

At RELEX, I maintained and developed new features for their Workforce Management (WFM) system. This included:

Backend in Elixir (Phoenix framework).
Microservices in NodeJS.
Frontend applications with React and Redux.

Fullstack Consultant, Blueprint Genetics

Helsinki, Finland | 2023-06-01 - 2024-01-01

Contributed to Blueprint's Nucleus system, focusing on their frontend (React) and backends (PHP, Golang). Tasks included:

SQL migrations (Flyway) and backend improvements.
React frontend refactoring and data-fetching optimization.
Integration tests (Robot framework) and unit testing for all components.

Key achievements: Delivered new products, improved frontend architecture, and enhanced release planning.

Fullstack Consultant, Barona

Helsinki, Finland | 2023-06-01 - 2024-01-01

Led a greenfield project for Barona, developing a platform with NodeJs, React, and AWS. Responsibilities included:

Building private RESTful APIs (Koa.js, TypeScript).
End-to-end testing (Vitest) and platform documentation.

Completed the project on time, with commendation for communication and meeting client expectations.

Frontend Developer, Barona

Helsinki, Spain | 2021-01-01 - 2022-08-01

Developed web applications using Next.js and Express. Contributions included:

Building responsive frontends (Tailwind CSS).
Developing RESTful APIs (Node.js, Express, ElasticSearch).
Testing with Jest and collaborating closely with clients.

Frontend Developer, Sesame

Valencia, Spain | 2021-01-01 - 2022-08-01

Led frontend development, guiding a small team to improve app performance and architecture. Key contributions:

Optimized frontend architecture and collaborated with the design team on reusable components.
Integrated system design and mentored junior developers.

Fullstack Developer, Sngular

Valencia, Spain | 2020-01-01 - 2021-01-01

Worked on multiple projects, including MSC and AECOC, providing both PMO and development support. Focus areas:

Architectural solutions using Java and AWS.
Simultaneously managing multiple projects and client meetings.

Backend Developer, PFS

Valencia, Spain | 2017-01-01 - 2020-01-01

Developed software solutions for the banking sector. Key responsibilities:

Resolved big data challenges with Java and OracleDB.
Implemented ETL processes and worked with Python for complex tasks.

About Me

At Work

With almost 8 years of coding experience, I bring a strong attention to detail and a committed work ethic to every project. I’m skilled in collaborating within teams but also thrive when working independently.

I enjoy collaborating and supporting teammates, and I naturally take on leadership roles when needed, guiding projects forward while encouraging a positive, productive environment. My goal is to create solutions that benefit the team and foster growth for everyone involved.

My Personal Side

Personally, I love my work and have always enjoyed learning and feeling that I’m improving. I always try to stay informed about new technologies.

Some things I enjoy besides programming are: playing video games, reading books, playing paddle tennis, and enjoying life.

Location

06:38 PM Tuesday, December 3

Education

Higher Technical Certificate, where I gained a comprehensive understanding of the theoretical and practical aspects of my field.I am also committed to continuous self-learning, dedicating time every day to improve my skills and stay updated with the latest developments in the field.