Daniel Yokoyama - Senior Frontend Developer

Q: Where is Daniel based?

Daniel is based in Ahrensburg, Germany and can operate in on-site , hybrid , and remote work models.

Q: What languages does Daniel speak?

Daniel speaks the following languages: German (Native), English (Advanced), Japanese (Elementary) .

Q: How many years of experience does Daniel have?

Daniel has at least 10 years of experience. During this time, Daniel has worked in at least 2 different roles and for 10 different companies . The average length of individual experience is 1 year . Note that Daniel may not have shared all experience and actually has more experience.

Q: What is Daniel's latest experience?

Daniel's most recent position is Senior Frontend Developer at node.energy .

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

In recent years, Daniel has worked for node.energy , B.Braun , porta Möbel Onlineshop , BMW Alphabet , and MediaMarktSaturn Retail Group .

Q: Which industries is Daniel most experienced in?

Daniel is most experienced in industries like Manufacturing , Retail , Media, and Entertainment and Publishing . Daniel also has some experience in Energy , Automotive , and Information Technology (IT) .

Q: Which business areas is Daniel most experienced in?

Daniel is most experienced in business areas like Information Technology (IT) , Product Development , and Quality Assurance (QA) . Daniel also has some experience in Marketing .

Q: Which industries has Daniel worked in recently?

Daniel has recently worked in industries like Energy , Retail , and Automotive .

Q: Which business areas has Daniel worked in recently?

Daniel has recently worked in business areas like Information Technology (IT) , Product Development , and Quality Assurance (QA) .

Recommended expert

Ahrensburg, Germany

Experience

Jan 2024 - Dec 2025

2 years

Senior Frontend Developer

node.energy

Significant enhancement of the B2B React SPA software "opti.node" for commercial operations management for renewable energy plant operators
Introduced features not previously available on the market, resulting in a significant revenue increase
Comprehensive automated tests within Storybook
Introduced a UI library to improve developer experience and speed up feature development by about 40%
Clear presentation of complex commercial and legal issues, with intuitive UX and UI
UX consulting to shorten essential interaction flows by 75%

Oct 2023 - Dec 2023

3 months

Senior Frontend Developer

B.Braun

Time-critical development of an MVP with Angular for health care management software
Delivered on time for the customer presentation
Adhered to all technical requirements and code standards within a SAFe process

Jan 2023 - May 2023

5 months

Senior Frontend Developer

porta Möbel Onlineshop

Relaunched the online shop using Next.js 13 and React Server Components in an Nx monorepo setup
Implemented new features and optimized the component library for scalable use across multiple brands
Enabled fast design reviews through Storybook
Built an automated test system
Ensured accessibility on both technical and UX levels

Feb 2022 - Sep 2022

8 months

Lead Frontend Developer

BMW Alphabet

Lead developer for the international relaunch of BMW's leasing brand as a React application in a headless architecture
Led the team and onboarded two team members
Developed a modular component library for flexible and consistent use beyond the initial content
UX consulting to optimize components for accelerated developer experience and to meet time and budget targets
Transparent presentation of components via Storybook
Built an automated testing system for functional unit and component tests as well as visual regression tests

Sep 2020 - Dec 2021

1 year 4 months

Senior Frontend Developer

MediaMarktSaturn Retail Group

Developed a new platform for online sales of single items and overstock from all stores in Germany
Increased revenue by significantly expanding reach beyond local catchment areas
Developed specialized marketing and landing pages and created a tailored React component library
Provided an overview of designs and UX components via Storybook

Nov 2017 - Apr 2020

2 years 6 months

Senior Frontend Developer

WAGO Verbindungstechnik

Iteratively introduced Vue.js components into the existing legacy JS/jQuery codebase, leading to better UX and 40% reduced load times in critical interaction paths
UX consulting for faster iteration of complex features and interaction flows
Internationalization of a hybrid content and shop website by developing a clear template interface for multilingual content
Integrated the frontend into a SAP Hybris / SAP Commerce environment
Worked in distributed teams, managing requirements for the backend team interface, achieving around 20% faster feature development turnaround
Optimized development workflows and introduced Git Flow

Apr 2017 - Nov 2017

8 months

Senior Frontend Developer

medion GmbH

Implemented a shop frontend for digital content for the Aldi and Hofer brands
Developed dynamic jQuery components to extend shop features
Integrated into a SAP Hybris environment

Nov 2016 - Mar 2017

5 months

Senior Frontend Developer

Deutsche See

Shop relaunch for the wholesale and retail seafood retailer
Created a dedicated Shopware 5 theme
Developed dynamic template and content modules
Used Lighthouse for performance analysis and optimization

Sep 2016 - Oct 2016

2 months

Senior Frontend Developer

Die Techniker

Implemented a scrollytelling campaign with complex 3D animations tied to scroll movements
Synchronized prerendered videos, scroll actions, and animated frontend elements in the browser
Developed dedicated jQuery components to control all elements

Aug 2014 - Aug 2016

2 years 1 month

Senior Frontend Developer

Der Spiegel

Migrated the video players on the Spiegel Online and Manager Magazin Online portals
Conducted requirements analysis for potential video players for video-on-demand and live streams
Integrated ad systems into the videos using VAST

Industries Experience

See where this freelancer has spent most of their professional time. Longer bars indicate deeper hands-on experience, while shorter ones reflect targeted or project-based work.

Experienced in Manufacturing (2.5 years), Energy (2 years), Retail (2 years), Media and Entertainment (2 years), Automotive (0.5 years), and Information Technology (0.5 years).

Manufacturing

Energy

Retail

Media and Entertainment

Automotive

Information Technology

Business Areas Experience

The graph below provides a cumulative view of the freelancer's experience across multiple business areas, calculated from completed and active engagements. It highlights the areas where the freelancer has most frequently contributed to planning, execution, and delivery of business outcomes.

Experienced in Information Technology (10 years), Product Development (6 years), and Quality Assurance (0.5 years).

Information Technology

Product Development

Quality Assurance

Summary

As a Senior/Lead Frontend Developer with 24 years of professional experience and deep JavaScript expertise, I design React/TypeScript frontends with outstanding UX, high accessibility, and a clear focus on measurable business value. I have transformed complex B2B and e-commerce projects (e.g. node.energy, porta, BMW Alphabet, MediaMarktSaturn) using component-driven development with Storybook, test automation (Jest, Playwright), and modern state/API solutions (TanStack Query, GraphQL, OpenAPI) to shorten time-to-market and boost developer productivity. In agile environments (Scrum/SAFe), I deliver high-performance, maintainable solutions on time and within budget, combining technical excellence with direct business impact.

Skills

Frontend Development: React, Typescript, Next.js (Ssr, Ssg), Html5, Css3 (Scss, Postcss, Css Modules, Css-in-js), Javascript (Es6+), Vue.js, Angular, Jquery
User Experience (Ux) & Design Systems: Ux Consulting, Component-driven Development, Storybook, Atomic Design, Ui Libraries (Mantine Ui, Material Ui, Mui Base), Prototyping, Responsive Design, Figma
Accessibility: Wcag 2.2, Aria, Bitv 2.0, Bfsg, Jest-axe
State & Data Management: Tanstack Query (React Query), Graphql, Openapi, Rest, Axios, React Router, Vuex, Headless Cms Integration (Contentful, Drupal)
Test Automation & Quality Assurance: Jest, React Testing Library, Playwright (E2e), Cucumber, Visual Regression Tests, Code Reviews, Tdd/bdd, Clean Code
Build Tools & Delivery: Ci/cd, Git (Github, Gitlab), Npm, Webpack, Babel, Vite, Nx (Monorepo)
Processes & Project Management: Scrum, Kanban, Agile, Safe (Scaled Agile Framework), Feature-driven Development (Fdd), Okr, Technical Documentation, Confluence, Jira
Soft Skills & Leadership: Mentoring, Strong Communication Skills, Proactive Problem Solving, Learning Agility, System Architecture Analysis, Optimizing Developer Experience (Dx), Team Leadership (2–4 Developers)
Performance & Seo: Performance Optimization, Seo (Schema.org, Ld+json), Lighthouse
Other Tools & Techniques: React Hook Form, Eslint, Prettier, Github Copilot, Ai-assisted Development, Internationalization (I18n)

Languages

German

Native

English

Advanced

Japanese

Elementary

Education

Oct 1999 - Sep 2004

FH Wedel

Diploma in Media Informatics (FH) · Media Informatics · Wedel, Germany

Certifications & licenses

Professional liability insurance

exali AG / Markel Insurance

Profile

Created

November 2025

Last Update

January 2026

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Frequently asked questions

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

Where is Daniel based?

Daniel is based in Ahrensburg, Germany and can operate in on-site, hybrid, and remote work models.

What languages does Daniel speak?

Daniel speaks the following languages: German (Native), English (Advanced), Japanese (Elementary).

How many years of experience does Daniel have?

Daniel has at least 10 years of experience. During this time, Daniel has worked in at least 2 different roles and for 10 different companies. The average length of individual experience is 1 year. Note that Daniel may not have shared all experience and actually has more experience.

What roles would Daniel be best suited for?

Based on recent experience, Daniel would be well-suited for roles such as: Senior Frontend Developer, Lead Frontend Developer.

What is Daniel's latest experience?

Daniel's most recent position is Senior Frontend Developer at node.energy.

What companies has Daniel worked for in recent years?

In recent years, Daniel has worked for node.energy, B.Braun, porta Möbel Onlineshop, BMW Alphabet, and MediaMarktSaturn Retail Group.

Which industries is Daniel most experienced in?

Daniel is most experienced in industries like Manufacturing, Retail, Media, and Entertainment and Publishing. Daniel also has some experience in Energy, Automotive, and Information Technology (IT).

Which business areas is Daniel most experienced in?

Daniel is most experienced in business areas like Information Technology (IT), Product Development, and Quality Assurance (QA). Daniel also has some experience in Marketing.

Which industries has Daniel worked in recently?

Daniel has recently worked in industries like Energy, Retail, and Automotive.

Which business areas has Daniel worked in recently?

Daniel has recently worked in business areas like Information Technology (IT), Product Development, and Quality Assurance (QA).

What is Daniel's education?

Daniel attended FH Wedel for Media Informatics.

Does Daniel have any certificates?

Daniel has 1 certificate: Professional liability insurance.

What is the availability of Daniel?

Daniel will be available from May 2026.

What is the rate of Daniel?

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