Sebastian Fuentes - Senior Frontend Dev / Consultant

Q: Where is Sebastian based?

Sebastian is based in Berlin, Germany and prefers 100% remote projects.

Q: What languages does Sebastian speak?

Sebastian speaks the following languages: German (Advanced), English (Advanced) .

Q: How many years of experience does Sebastian have?

Sebastian has at least 23 years of experience. During this time, Sebastian has worked in at least 18 different roles and for 26 different companies . The average length of individual experience is 1 year and 10 months . Note that Sebastian may not have shared all experience and actually has more experience.

Q: What is Sebastian's latest experience?

Sebastian's most recent position is Senior Frontend Dev / Consultant at bettermarks.de .

Q: What companies has Sebastian worked for in recent years?

In recent years, Sebastian has worked for bettermarks.de , WMF , and WMF / GroupeSEB .

Q: Which industries is Sebastian most experienced in?

Sebastian is most experienced in industries like Information Technology , Manufacturing , and Tourism . Sebastian also has some experience in Banking and Finance , Telecommunication , and Education .

Q: Which business areas is Sebastian most experienced in?

Sebastian is most experienced in business areas like Information Technology , Product Development , and Project Management . Sebastian also has some experience in Quality Assurance .

Q: Which industries has Sebastian worked in recently?

Sebastian has recently worked in industries like Manufacturing , Education , and Information Technology .

Q: Which business areas has Sebastian worked in recently?

Sebastian has recently worked in business areas like Information Technology , Project Management , and Quality Assurance .

Recommended expert

Berlin, Germany

Experience

Dec 2024 - Present

1 year 4 months

Senior Frontend Dev / Consultant

bettermarks.de

Developing / Maintaining current modules
Asserting the current state of the architecture and implementation
Giving guidance for future development
Mentoring team members
Developing a standard blueprint library for others to follow

Technologies: React, Redux, Jest, Kotlin

Oct 2021 - Dec 2021

3 months

Project Owner - Interim

WMF

Overseeing the B2B online shop of WMF
Stakeholder and vendor management
Technical planning and roadmap development

Dec 2020 - Nov 2024

4 years

Frontend Lead / Architect / Consultant

WMF / GroupeSEB

Reimplementation of an IoT Platform (Coffeesmart)
Overseeing the cross-team communication
Go-to person for all topics concerning front end
Code quality oversight and mentoring
Development process design for back end and front end
Interfacing between business and technical stakeholders
Setting up a performance and API testing solution
Hiring and team transition
Scrum and agile consulting

Technologies: VUE, Webpack, ES6, TypeScript, Azure

Aug 2020 - Dec 2020

5 months

Senior Frontend Developer / Architect

eHealth-Tec

Development of several user interfaces for electronic prescriptions

Technologies: React.js, Redux, Webpack, ES6, TypeScript

Jan 2020 - Apr 2020

4 months

Interim Frontend Lead / Architect

Travelcircus.de

Set up a new front-end team, including interviews and CV screening
Evaluation of the existing codebase
Creation of a migration concept
Development of a draft for the user self-service portal
Team coaching and mentoring
Consultation support regarding agile processes
Communication interface between CTO and project management

Technologies: React.js, Redux, Webpack, ES6

Aug 2019 - Jan 2020

6 months

Consultant / Architect / Senior Frontend Developer

Ideal Versicherung

Creation of a front-end architecture and software design for a self-service portal
Scope planning and conceptual work
Implementation of the created architecture
Mentoring and training existing team members in React and modern JavaScript

Technologies: React.js, Redux, Webpack, ES6, Victory Charts

Apr 2019 - Jul 2019

4 months

Senior Frontend Developer / Architect

Neofonie

Reimplementation of a B2B service application for the travel/sourcing market
Scope planning and conceptual work
Ramp-up phase with focus on maintainability and enterprise grade code
Constant communication with the HRS enterprise architect

Technologies: React.js, Redux, Webpack, ES6, API/interface testing, mock data generation

Jun 2018 - Mar 2019

10 months

Senior Frontend Developer / Frontend Architect / Team Captain

HRS Innovation Hub

Migration of the hotel.de application to a new tech stack
Scope planning and conceptual work
Mentoring and hiring
Team leadership
Communication interface between tech leadership, dev teams, and the product team

Technologies: React.js, Redux, GraphQL, Webpack, ES6, Node.js

Mar 2017 - Jun 2018

1 year 4 months

Senior Frontend Developer / Frontend Architect

Adidas

Reimplementation of the B2B order intake system “Click”
Conception and implementation of the SPA architecture
Concept and implementation of base components and backend services
Mentoring and reviewing new team members and five front-end teams

Technologies: React.js, Redux, Webpack, ES6, API design, OpenAPI/BluePrint

Nov 2016 - Feb 2017

4 months

Senior Frontend Developer / Frontend Architect

Bettermarks

Concept and architecture for a tech stack migration from ActionScript/Flash to React
Implementation of the prototype and MVP
Training and mentoring the team
Concept for next steps and evaluation of different libraries

Technologies: React.js, Redux, Webpack, PouchDB, ES6, Canvas, SVG

Oct 2015 - Sep 2016

1 year

Product Owner - Clients (iOS, Android, Web, Frontend - Backend)

Immmr

Product development and overall project steering
Project steering for all client development
Team leading for four client development teams (20 people)
Development of business requirements
Communication interface for CTO/CPO and development teams
Mentoring

Feb 2015 - Aug 2015

7 months

Senior Frontend Developer

Immmr

Development of a WebRTC-based offline-first communication web client

Technologies: React.js, CouchDB/PouchDB, Webpack, ES6

Oct 2014 - Dec 2014

3 months

Senior Frontend Developer

Moccu

Jun 2014 - Oct 2014

5 months

Senior Frontend Developer

Triad

May 2014 - Jun 2014

2 months

Senior Front-end Developer

Actano

May 2013 - Apr 2014

1 year

Senior Front-end Developer

Deutsche Post e-post

Senior front-end development for Epost Safe

Oct 2012 - Apr 2013

7 months

Senior Front-end Developer

Telekom Innovation Labs | Appzonaut

Dec 2011 - Mar 2012

4 months

Senior Front-end Developer

FP Commerce / home24.de

Mar 2011 - Aug 2012

1 year 6 months

Senior Front-end Developer

DDB Tribal Berlin

Nov 2010 - Nov 2011

1 year 1 month

Lead Developer | China Maps Nokia; Senior Web Developer | Volkswagen Car Configurator

AKQA

Jul 2010 - Oct 2010

4 months

Team Lead | Integration Platform

BigPoint

Feb 2010 - May 2010

4 months

Senior Web Developer | Nokia Maps

AKQA

Jan 2006 - Dec 2007

2 years

WebMaster

Yachthafen Residenz Hohe Düne

Jan 2005 - Dec 2005

1 year

Web Developer / Webmaster

IP Knowledge

Jan 2004 - Dec 2004

1 year

Web Developer

Knowledge Solutions

Jan 2003 - Dec 2003

1 year

Team Lead WebDev

Platinum Visions

Jul 1999 - Oct 2001

2 years 4 months

Web Developer

Nets AG

Oct 1998 - Mar 1999

6 months

Web Developer

Amazon.de

Industry Experience

See where this freelancer has spent most of their professional time.

Experienced in Information Technology, Manufacturing, Tourism, Banking and Finance, Telecommunication, and Education.

Information Technology

Manufacturing

Tourism

Banking and Finance

Telecommunication

Education

Business Area Experience

See which departments and functions this freelancer has contributed to most.

Experienced in Information Technology, Product Development, Project Management, and Quality Assurance.

Information Technology

Product Development

Project Management

Quality Assurance

Summary

I primarily support customers in implementing software development processes while simultaneously developing products, including tech stack migrations, team building, mentoring, and the development of suitable sustainable architectures, which are the basis of my work.

For most clients, architecture, agile process methodologies, and team management are not limited to the front end, as the required trades are often comprehensive. This also includes data protection, data design, and security concepts.

My customers and I do not see me as a pure workbench but as someone who helps a customer develop software beyond the time of the commitment that is maintainable and understandable and remains manageable along its life cycle. For me, clean code, testing, process methodologies, code style, and the many other components of the rapidly changing software ecosystem are a means to and not an end in themselves to achieve this goal.

I usually get involved in project management & steering questions such as team composition and milestone planning to bring in my long project experience.

Languages

German

Advanced

English

Advanced

Statistics

Experience

Total positions 28

Experience in Information Technology 7.5 y

Avg length 10 m

Longest experience 3 y 11 m

Expertise

Recent roles Senior Frontend Dev / Consultant, Project Owner - Interim, Frontend Lead / Architect / Consultant

Main industries Information Technology, Manufacturing, Tourism

Main business areas Information Technology, Product Development, Project Management

Profile

Created

January 2025

Last Update

February 2025

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Frequently asked questions

Do you have questions? Here you can find further information.

Where is Sebastian based?

Sebastian is based in Berlin, Germany and prefers 100% remote projects.

What languages does Sebastian speak?

Sebastian speaks the following languages: German (Advanced), English (Advanced).

How many years of experience does Sebastian have?

Sebastian has at least 23 years of experience. During this time, Sebastian has worked in at least 18 different roles and for 26 different companies. The average length of individual experience is 1 year and 10 months. Note that Sebastian may not have shared all experience and actually has more experience.

What roles would Sebastian be best suited for?

Based on recent experience, Sebastian would be well-suited for roles such as: Senior Frontend Dev / Consultant, Project Owner - Interim, Frontend Lead / Architect / Consultant.

What is Sebastian's latest experience?

Sebastian's most recent position is Senior Frontend Dev / Consultant at bettermarks.de.

What companies has Sebastian worked for in recent years?

In recent years, Sebastian has worked for bettermarks.de, WMF, and WMF / GroupeSEB.

Which industries is Sebastian most experienced in?

Sebastian is most experienced in industries like Information Technology, Manufacturing, and Tourism. Sebastian also has some experience in Banking and Finance, Telecommunication, and Education.

Which business areas is Sebastian most experienced in?

Sebastian is most experienced in business areas like Information Technology, Product Development, and Project Management. Sebastian also has some experience in Quality Assurance.

Which industries has Sebastian worked in recently?

Sebastian has recently worked in industries like Manufacturing, Education, and Information Technology.

Which business areas has Sebastian worked in recently?

Sebastian has recently worked in business areas like Information Technology, Project Management, and Quality Assurance.

What is the availability of Sebastian?

Sebastian is immediately available full-time for suitable projects.

What is the rate of Sebastian?

Sebastian's rate depends on the specific project requirements. Please use the Meet button on the profile to schedule a meeting and discuss the details.