freiberufler Fullstack Software Developer (NodeJS, Python // JavaScript, TypeScript, React, React Native // AWS // Salesforce, APEX) auf

Fullstack Software Developer (NodeJS, Python // JavaScript, TypeScript, React, React Native // AWS // Salesforce, APEX)

zuletzt online vor wenigen Minuten
  • 65‐80€/Stunde
  • 20359 Hamburg
  • DACH-Region
  • es  |  en  |  de
  • 09.11.2023


I am a software developer with nearly 5 years experience. I focus working in frontend with JavaScript / Typescript with React / React Native and Python / NodeJS in backend. I further contribute a well structured working style and an eye for UI / UX.


  • Amazon Web Services (AWS)
  • CSS (Cascading Style Sheet)
  • Figma
  • Full-Stack
  • HTML
  • JavaScript
  • MongoDB
  • Node.js
  • Python
  • React (JavaScript library)
  • React Native
  • Software engineering / -technik
  • Syntactically Awesome Stylesheets (Sass)
  • TypeScript
  • UI/UX
  • User Interface (UI)

Projekt‐ & Berufserfahrung

Software Developer (Festanstellung)
Mertus Consulting GmbH, Hamburg
3/2023 – offen (1 Jahr)
IT & Entwicklung

3/2023 – offen


Project 1:
Salesforce CRM

Description: I am leading a project aiming to automate and optimize internal processes by
taking advantage of the customizability of Salesforce. My responsibilities reach from the
business analysis with C-level and stakeholders to the design of an optimization roadmap
and the actual customization within the CRM.

• Identify potentials for automation with stakeholders through business analyses.
• Define roadmap considering potentials and priorities.
• Customize within Salesforce to replicate the defined processes within the CRM.
• Researching and developing interfaces to integrate third-party and Mertus’ internal solutions with Salesforce CRM.
• Developing complex automated contract generation for multiple contract types within Salesforce including integration of third party digital signature solution (DocuSign).

Goals achieved: Integrated three solutions in Salesforce optimizing the workflow for the
sales and recruiting team.

Technologies / Methods: Salesforce, APEX, APIs, Salesforce CLI

Project 2:
Mertus Management System

Description: I lead a notable project where my responsibilities are focused on the development of a platform that streamlines and automates the client approval process for freelancer performance records. In this project, I play a key role in designing and building the platform from the ground up, employing cutting-edge technologies and industry best practices.

• Design Wireframes and discuss features implementation with stakeholders
• Define together with the team technologies and infrastructure to use on the project.
• Develop frontend using React
• Develop backend using ExpressJS
• Develop scheduled function to send email reminders

Goals achieved: Build a first version in less than 2 months of conceptualization, design and development.

Technologies / Methods: Typescript, React, ExpressJS, MongoDB, Firebase (Auth, Hosting, Storage, Cloud Functions), Chakra UI, Figma, Postman, Trello.

Project 3:
Client Industry: Event Technology (AV)
Austria & remote

Description: I undertook the task of renovating the entire interface of a software used to control a beamer for light shows, incorporating new features, rectifying bugs, and significantly enhancing the overall user experience.

• Identify necessary adjustments and modifications to align with the wireframe layout
• Verify the compatibility of the rearranged styles across different devices and screen sizes
• Conduct rigorous testing to validate the accuracy and effectiveness of the updated styles in meeting the wireframe requirements.

Goals achieved: Successfully delivery of project in record time.

Technologies / Methods: Typescript, HTML, Snowpack, SASS, CSS

Eingesetzte Qualifikationen

CSS (Cascading Style Sheet), HTML, MongoDB, Software engineering / -technik, Syntactically Awesome Stylesheets (Sass), TypeScript, User Interface (UI)

Fullstack Developer (Festanstellung)
Ally Logistics LLC, Medellin
2/2022 – 3/2023 (1 Jahr, 2 Monate)

2/2022 – 3/2023


Lean Tech
Medellin, Colombia & remote – IT Consulting


Ally Logistics LLC

Description: Logistics and supply chain management in USA. We are a team of 4 developers, a scrum master, a QA specialist and a project manager. We are developing a web application called CapacityNow whose purpose is to provide real-time freight rates for customers based on a set of business rules.

• Maintain API REST services within the application
• Design and develop new endpoints for the application
• Make documentation of the API using Postman
• Perform unit testing using Jest.
• Fix issues and bugs
• Advise the client about technical issues
• Propose new ideas to improve the application.

Goals achieved: We performed the release of a new version of the application with a set of new features successfully.

Technologies / Methods: NodeJS, ExpressJS, Mongoose, Jest, Postman, MongoDB, Bitbucket, Jira, Scrum


Description: Watches store through mobile application. We were a team of six developers, a scrum master, QA specialist, UI/UX Expert, Business Analyst and a Project Manager. A multiplatform mobile application was developed with the purpose of creating a platform for selling and buying watches through a dealer-to-dealer connection.

• Participate in design and concept of screens.
• Develop new UI features in the mobile application
• Integrate mobile application with API REST services
• Participate in revision and approval of Pull Requests
• Integrate and maintain monitoring tool for troubleshooting within the mobile application UI

Goals achieved: Develop and release new features in shortest possible time.

Technologies / Methods: React Native, React Query, Jest, Sentry, Firebase Storage, Jira, Bitbucket.

Eingesetzte Qualifikationen

MongoDB, Node.js, React (JavaScript library), React Native, SCRUM, User Interface (UI)

WEB UI Developer (Festanstellung)
Globant S.A.S., Medellin
7/2021 – 9/2022 (1 Jahr, 3 Monate)
IT & Entwicklung

7/2021 – 9/2022


Globant S.A.S
Medellin, Colombia & remote – IT Consulting


Asociación Chilena de Seguridad (ACHS)

Description: Working on the renovation of the virtual ACHS platform, which has more than 700 thousand users throughout Chile. ACHS is a Chilean company in charge of managing occupational health and safety for the majority of Chilean workers. I was part of a huge team of seven developers, a business analyst, scrum master, product owner, two QA specialists and a Devops.

• Develop new views and functionalities in the GUI of the web platform based on a template delivered by the UI/UX team.
• Propose and contribute to good development practices, readability, and code maintenance.
• Develop REST APIs and queuing processes in several of the microservices that integrate the Virtual ACHS platform.
• Writing SQL statements taking into account optimization criteria for application performance.
• Writing unit tests with coverages above 80%.
• Attend meetings to make critical decisions within the project to improve performance and user experience when using the application.
• Refine and plan development and technical tasks within the project.
• Project management through various Azure cloud tools such as Azure DevOps, Azure Data Factory, Azure Active Directory, and Azure Application Insights.

Goals achieved: Participate in development of a platform for a target audience of more than 700 thousand users.

Technologies / Methods: React JS, Redux Tool Kit, Nest JS, Typescript, Microsoft SQL, Redis, Jest, Swagger, SonarQube, Microsoft Azure, Azure DevOps.

Eingesetzte Qualifikationen

TypeScript, User Interface (UI), Microsoft Azure, React (JavaScript library)

Development Engineer (Festanstellung)
SRR, Baranquilla
9/2020 – 4/2021 (8 Monate)
Hochschulen und Forschungseinrichtungen

9/2020 – 4/2021


SRR Seguridad Privada – Universidad del Norte
Barranquilla, Colombia & remote - Security

Description: Design and development of a web application for open source reliability analysis. Tool that allows consulting antecedents and content of social media of natural persons, legal entities and foreigners. The system integrates artificial intelligence technologies such as Sentiment Analysis, Entity Recognition, Text Summarization and Face Recognition. I was part of a small team of two developers including myself. I participated mainly on the frontend development but also in the architecture design and concept.

• Design and develop UI of the web application
• Integrate API services on the frontend
• Design and develop web scrapping pipelines
• Integrate third party NLP services within the application
• Design of architecture and database
• Participate in meetings with the client to discuss about the project progress

Goals achieved: Build a web application with a great set of features: Export reports to PDF files, getting public information of people in social media and analyze it with natural language processing providing metrics and insights.

Technologies / Methods: React.js (Redux and React Router), HTML5/CSS3, JSPDF, Selenium, BeautifulSoup, Django (Python), AWS (EC2, RDS), NGINX/GUNICORN/MYQSL, IBM (Natural Language Understanding), Firebase Storage, RabbitMQ, SMTP Service Integration (Netcore), WebScraping.AI, Git y Github.

Eingesetzte Qualifikationen

Python, Amazon Web Services (AWS), Django (Framework), React (JavaScript library)

Fullstack Developer (Festanstellung)
MinCiencias – Universidad del Norte, Baranquilla
7/2019 – 9/2020 (1 Jahr, 3 Monate)
Hochschulen und Forschungseinrichtungen

7/2019 – 9/2020


MinCiencias – Universidad del Norte
Barranquilla, Colombia & remote / on site – Education and Research

Description: Development of multiplatform mobile application. Mobile application "Entre Líneas" under the framework of the Colciencias project "DESIGN AND APPLICATION OF AN APP TO STRENGTHEN READING COMPREHENSION IN LANGUAGE AND SECOND LANGUAGE (ENGLISH) FOR HIGHER EDUCATION STUDENTS". I was the only developer in this project. This was a research project with the purpose of build a tool to enhance reading comprehension in Colombian undergraduate students.

• Develop of mobile application UI
• Design and develop of API REST services
• Discuss with the UI/UX the design and concept of screens
• Integrate API services to the frontend
• Build documentation of the application
• Participate in meetings to take critical technical decisions about the project
• Perform pilot tests of the mobile application

Goals achieved: Develop the entire platform (backend/frontend) in one year. Perform pilot tests with more than 200 different undergraduate students, obtaining suitable results in user experience.

Technologies / Methods: React Native (Redux, React Navigation), Django/Python (Rest Framework, FCM), Firebase Messaging, AWS (EC2, RDS), NGINX, MYSQL, SMTP Service Integration (Netcore), Git & Github.

Eingesetzte Qualifikationen

Python, Amazon Web Services (AWS), Django (Framework), React Native

Mobile Developer (Festanstellung)
Dolmen S.A E.S.P - Universidad del Norte, Baranquilla
3/2019 – 7/2019 (5 Monate)
Hochschulen und Forschungseinrichtungen

3/2019 – 7/2019


Dolmen S.A E.S.P – Universidad del Norte
Barranquilla, Colombia & remote / on site – Urban Mobiliary

Description: Design and development of offline-friendly mobile application for real-time registration of maintenance processes of public lighting and street furniture assets. I was the only developer in this project.

• Define and discuss mobile application requirements with the client.
• Design of UI/UX of mobile application using Balsamiq wireframes.
• Develop of mobile application UI.
• Design of API REST services data structure.
• Integrate API services to the frontend
• Build documentation of the application
• Conduct pilot tests in field.
• Training of work personnel to start using the mobile app.

Goals achieved: Design and develop an offline-friendly mobile application in less than 3 months. The app has the capability to persist data without internet connection and then upload it when the connection is recovered.

Technologies / Methods: React Native (Redux, React Navigation), Android Studio, Balsamiq, Git y Github.

Eingesetzte Qualifikationen

Android, React Native

Junior Frontend Developer (Festanstellung)
GoCargo S.A.S, Baranquilla
12/2018 – 2/2019 (3 Monate)

12/2018 – 2/2019


GoCargo S.A.S
Barranquilla, Colombia & on site – Freight Transportation Tech

Description: GoCargo is an app that connects the carrier with the freight offer in real time. This application has a mobile platform that is used by truckers and a web platform used by companies.

• Develop new UI features on the web application
• Discuss with UI/UX team about design and usability issues.
• Maintain the UI web application.
• Solve bugs and issues within the application
• Integrate API services to the frontend
• Build documentation of the application

Goals achieved: Develop new features within the web application and propose new ideas to increase usability.

Technologies / Methods: AngularJS, HTML5, CSS3, Jira, Bitbucket and Git.

Eingesetzte Qualifikationen



Master's Degree in Electronics Engineering
Universidad del Norte
Bachelor’s Degree in Electronic Engineering
Universidad del Norte

Über mich

I am an expert with near to 5 years professional experience in software development. As a fullstack developer I have strong expertise in both front- and backend technologies. My technical focus is on Python as well as NodeJS with ExpressJS/NestJS for the backend and JavaScript / TypeScript with the frontend frameworks React & React Native. Furthermore, I contribute a clear structure as well as an eye for UI/UX design to my projects.

Ich bin ein Experte mit fast 5 Jahren Berufserfahrung in der Softwareentwicklung. Als Fullstack-Entwickler verfüge ich über fundierte Kenntnisse sowohl in Front- als auch in Backend-Technologien. Mein technischer Fokus liegt auf Python sowie NodeJS mit ExpressJS/NestJS für das Backend und JavaScript / TypeScript mit den Frontend-Frameworks React & React Native. Darüber hinaus bringe ich eine klare Struktur sowie ein Auge für UI/UX-Design in meine Projekte ein.

Weitere Kenntnisse

React, Redux, React Query, AngularJS, JavaScript,Typescript, CSS, SCSS, HTML, Bootstrap, Jasmine, Jest, Balsamiq Mockups, UI/UX, Figma

Python, Django, Flask, NodeJS, NestJS, ExpressJS, PostgresQL, Postman, Swagger, MYSQL, Microsoft SQL, MongoDB, Firebase Storage/ Messaging / Database, Redis

DevOps / Scrum:
Bitbucket Pipelines, Elastic Beanstalk, EC2, RDS, S3, Lambda, CloudFormation, Docker, Kubernetes, NGINX, Jira / Trello, Bitbucket, GitLab, Git, Azure Devops

KI / Automatisierungen:
Selenium, Pytorch, Tensorflow, ONNX, BeautifulSoup, JSPDF, Numpy, Pandas, Scikit Learn, HuggingFace, NLTK, Apache Spark

Salesforce, Salesforce CLI, APEX

Persönliche Daten

  • Spanisch (Muttersprache)
  • Englisch (Fließend)
  • Deutsch (Gut)
  • Europäische Union
5 Jahre und 2 Monate (seit 12/2018)


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