Deniel H.-Interim Frontend Lead & Senior Frontend Engineer
Check rate
Experience
Shareholder & Senior Engineer, Product and Go-to-Market
Continua Systems GmbH
Consulting and software for intralogistics automation (AGV/FTS) · Product lines AGVHub (independent AGV project consulting, layout editor) and OneBob (all-in-one business software for small teams)
- Designed and planned the implementation of a supervisory control system for a bakery production line (engineering customer, kick-off workshop 08/2025): three development stages, eight acceptance-ready milestones, batch traceability, AGV integration with RFID, Vue frontend.
- Discovery and requirements discussions with plant logistics and IT teams at industrial customers (life science, aviation, steel, engineering): translated supervisory control, ERP interface, and VDA 5050 requirements into architecture and requirements specification structures.
- Go-to-market automation and analytics: Bing and Meta campaigns, LLM-supported LinkedIn content pipeline, performance dashboards for partners and sales.
- Expert posts on LinkedIn about robotics and intralogistics: around 170,000 impressions across 41 posts (03 to 08/2026).
Lead Frontend Engineer, Design System
Institut der Wirtschaftsprüfer in Deutschland e.V. (IDW)
Relaunch of the IDW portal (live 2026): Design System for the FirstSpirit CMS
- Built the Component Library from scratch: Storybook 9 as the delivery platform for HTML/CSS snippets in the FirstSpirit CMS; WCAG 2.2 AA, Design Tokens, BEM, visual regression tests with Playwright.
- Owned the architecture: wrote all Architecture Decision Records, including those for the token system, JavaScript usage, search, and login.
- Portal features: global search with autocomplete, login flows, navigation, and Cookiebot; coordination with IDW, Materna, and the design agency.
Stack: TypeScript 5.8, HTML5, CSS (BEM, Design Tokens), Storybook 9, Vite 6, Vitest 4, Playwright, FirstSpirit CMS, Docker.
Interim Frontend Lead & Senior Frontend Engineer
GEBHARDT Intralogistics Group
Web UI monorepo for Warehouse Control System (WCS), AGV Control Center (ACC), and Sortation · Team of 8 to 10 developers, Azure DevOps
- Built the monorepo from scratch (first code commit 04/2023): turbo + pnpm, App/Module/Package structure, Shared Configs for TypeScript, ESLint, Prettier, and Vite, Azure Pipelines with artifact creation. Today: 10 apps, 6 modules, 37 packages.
- Owned the architecture: wrote 22 of the 29 Architecture Decision Records and was named decider, including for repository structure, Design System, styling, Component and E2E test strategy, Storybook documentation, Headless UI approach, replacement of Quasar, store structure, Error Handling, Naming Conventions, drag and drop, datetime handling, and Feature Flags via BFF runtime config.
- Led code quality: reviewed and approved 301 Pull Requests, introduced PR templates and review standards; established a test strategy with Vitest Component Tests, containerized Playwright E2E tests, and MSW mocking.
- Feature ownership for AGV Control Center: real-time fleet monitoring (map based on PixiJS/SignalR, data tables, analysis views), maintenance workflows, Feature Flag service, moving domain data into a Backend for Frontend.
- Built the Sortation module (2026) from the ground up, including its own Backend for Frontend and E2E coverage.
- Design System and documentation: Storybook setup in 2023 with a11y addon, upgrade to Storybook 9 (2025), icon generation, CSS utility system, i18n concept (PoC to vue-i18n in production).
- Results: 796 commits, 288 Work Items in 3.5 years.
Stack: Vue 3.5, TypeScript 6, Vite 8, Vitest 4, Playwright, Storybook 9, Pinia 3, vue-router 5, vue-i18n 11, Headless UI, TanStack Table, ECharts, PixiJS, SignalR, Keycloak, Zod, MSW, Bun/Elysia, swagger-typescript-api, turbo 2.9, pnpm 10, Node 24, Azure DevOps.
Frontend Architect
Bayer AG
MagicScout (magicscout.app) and international online shop
- Frontend architecture for MagicScout and Bayer's international online shop; tooling around the regulated labeling pipeline (validation, authoring process, approvals).
- Advanced multi-country rollouts (localization, payment methods); introduced a disciplined A/B testing process that measurably increased conversion and checkout completion.
- Reduced memory usage and bundle size, fixed leaks, and enforced performance budgets; built campaign and promotion tooling plus analytics used independently by marketing.
Senior Vue/Nuxt Developer
e-Spirit GmbH (Crownpeak)
FirstSpirit Enterprise CMS, public library for mapping CMS content and navigation into the PWA
- Reduced page render time by up to 60%, including through refactoring and reducing HTML tag depth.
- Hardened critical CMS components (Error Boundary, proxy components), extended Backend-for-Frontend microservices, and secured Component and E2E tests with Jest and Cypress.
Stack: Vue.js, Nuxt.js, TypeScript, JSX, Vuex, Tailwind, Jest, Cypress.
Co-founder & Tech Lead
Immo-mehr.de
Real estate platform with simplified Airbnb-style metrics
- Built the Vue/Nuxt frontend and AWS data platform from scratch (S3, Lambda, EC2, RDS/PostgreSQL, Django): ETL pipeline from six external sources, cleaning of highly unstructured data, batch aggregations.
- Set up the development and release process as Tech Lead for a distributed team of five contractors; launched the product and acquired the first paying customers.
Senior Frontend Engineer
GetYourGuide
Online travel platform (Unicorn), activity detail page
- Migrated all components of the activity detail page (gallery, booking assistant, comments) for millions of daily users without downtime.
- Designed and built booking assistants that guide users through the booking process; created components for A/B tests, measurably increasing conversion; Jest tests for all components.
Stack: Vue.js, Nuxt.js, Vuex, TypeScript, Jest, SCSS/BEM.
Senior Frontend Engineer
BCG Digital Ventures
Dashboard for detecting threats and ensuring the safety of employees worldwide
- Developed an interactive dashboard with live datasets (Vue, Vuesion, Chart.js, TypeScript, BEM/Atomic Design); delivered all components two weeks ahead of schedule, contributed to the open-source framework via GitHub Issues.
Senior Full Stack Developer
Charité / Dentalx.ai
ML platform for classifying dental X-ray images and 3D models
- Planned, designed, and developed the MVP (Vue.js), delivered four weeks ahead of schedule; image-labeling tool with time tracking to reduce costs, labeling ETL pipeline, analytics dashboard (Dash/Plotly, React).
Stack: Vue.js, React.js, Python 3, Django, Pandas, AWS (S3, Lambda, EC2, RDS, Redis).
Blockchain Topic Owner / Senior IT Consultant
Porsche Digital Lab & MHP GmbH
- Built MVPs for a decentralized vehicle data platform and for quality assurance in the supply chain (leather production), several of which were transferred to production development; first vehicle with a fully functional blockchain node.
- Led teams of two to five people, provided blockchain consulting across all VW brands, and conducted seminars on microservices, live-coding sessions, and workshops for colleagues and students.
Stack: React.js, Redux, Angular.js, TypeScript, Node.js, Solidity, Ethereum, Python, TensorFlow, AWS, Docker, Microservices.
Lead Software Developer
Acteno Energy GmbH
Time series analytics engine for investment decisions in the energy sector
- Designed and implemented report engine and dashboards (D3.js, TypeScript, C#/NET, LINQ, Oracle, MS Dynamics CRM): requirements analysis, architecture, test-driven development, integration of multiple third-party systems, aggregation and peak analyses.
Industry experience
See where this freelancer has spent most of their professional time.
Experienced in Automotive, Manufacturing, Transportation, Information Technology, Tourism, and Energy.
Business area experience
See which departments and functions this freelancer has contributed to most.
Experienced in Information Technology, Product Development, Quality Assurance, Business Intelligence, Logistics, and Marketing.
Summary
Senior Frontend Engineer with 12+ years of software development experience, working freelance in interim and lead roles since 2019. Most recently spent 3.5 years at GEBHARDT Intralogistics: built the web UI monorepo for a Warehouse Control System and AGV Control Center from scratch, owned the architecture across 22 ADRs, and led the review and quality process for 8 to 10 developers. Strengths: TypeScript-first, equally strong in Vue 3 and React, Design Systems, Micro-Frontends, BFFs, real-time visualization, test automation as a pipeline gate. Works daily with agentic tooling (Claude Code), has brought LLM features into own products, and leads through architecture decisions, code reviews, and mentoring.
- 12+ years of software development, including 7 as a freelancer
- Built and led an enterprise Vue monorepo at GEBHARDT for 3.5 years
- Owned 22 architecture decisions in the monorepo
- Led 8 to 10 developers through the review and quality process
- Millions of users per day during the GetYourGuide migration
- -60% render time in the FirstSpirit CMS frontend (e-Spirit)
Skills
Frontend
- Typescript, Vue 3 (Composition Api, Pinia, Vue-Router, Vue-I18n)
- Nuxt 3
- Quasar
- React 18
- Next.Js
- Redux/Hooks
- Headless Ui
- Tailwind
- Scss/Bem
- Atomic Design
- Storybook 9
- Design Systems
- Component Libraries
- Design Implementation From Figma
- Accessibility (Storybook A11y, Wcag Basics)
- Pwa
- Ssr
- I18n
- A/B Testing
Architecture
- Monorepos (Turbo, Pnpm Workspaces, Shared Configs)
- Micro-Frontends
- App/Module/Package Structure
- Backend For Frontend (Bun/Elysia, Node.Js)
- Openapi Codegen
- Zod
- Feature Flags
- Error Handling
- Store Design
- Real-Time (Signalr, Websockets)
- Maps And Visualization (Pixijs, Echarts, D3, Chart.Js)
- Performance And Core Web Vitals
Quality
- Vitest/Jest Component Tests
- Playwright E2e (Containerized)
- Cypress
- Msw Mocking
- Tdd
- Code Reviews
- Pr Templates
- Naming Conventions
- Adr Process
- Clean Code
Platform
- Azure Devops Pipelines
- Github Actions
- Docker
- Aws (S3, Lambda, Ec2, Rds)
- Vercel
- Keycloak/Oidc
- Ci/Cd As A Quality Gate
- Vite 8
Ai & Backend
- Claude Code (Daily, Multi-Agent Workflows, Headless Automation)
- Llm Integration (Openai, Gemini, Anthropic Apis)
- Prompt Pipelines With Qa Gates
- Node.Js
- Python/Django
- Graphql
- Rest
- Postgresql
- Basic Knowledge Of C#/.Net And Solidity
Domain
- Intralogistics: Warehouse Control System (Wcs), Agv Control Center, Sorting Systems, Supervisory Control, Material Flow, Fts/Agv, Vda 5050
- E-Commerce And Booking Flows
- Dashboards And Analytics
- Healthcare Ml
- Energy Time Series
Leadership
- Interim Lead
- Technical Team Leadership (2 To 5 People)
- Scrum Coach
- Mentoring
- Requirements Analysis
- Stakeholder Communication
- Workshops And Live Coding Sessions
- Fluent In German And English
Languages
Education
University of Southern Denmark / Hochschule Mannheim
B.Sc. · Computer Science · Mannheim, Germany
Statistics
Experience
Global experience
Expertise
Qualifications
Profile
Frequently asked questions
Have questions? Find more information here.
Deniel is based in Heidelberg, Germany.
Deniel speaks the following languages: German (Native), English (Advanced).
Deniel has at least 14 years of experience. During this time, Deniel has worked in at least 10 different roles and for 11 different companies. The average length of individual experience is 1 year and 3 months. Note that Deniel may not have shared all experience and actually has more experience.
Based on recent experience, Deniel would be well-suited for roles such as: Shareholder & Senior Engineer, Product and Go-to-Market, Lead Frontend Engineer, Design System, Interim Frontend Lead & Senior Frontend Engineer.
Deniel's most recent position is Shareholder & Senior Engineer, Product and Go-to-Market at Continua Systems GmbH.
In recent years, Deniel has worked for Continua Systems GmbH, Institut der Wirtschaftsprüfer in Deutschland e.V. (IDW), GEBHARDT Intralogistics Group, Bayer AG, and e-Spirit GmbH (Crownpeak).
Deniel is most experienced in industries like Automotive, Manufacturing, and Transportation. Deniel also has some experience in Information Technology, Tourism, and Energy.
Deniel is most experienced in business areas like Information Technology, Product Development, and Quality Assurance. Deniel also has some experience in Business Intelligence, Logistics, and Marketing.
Deniel has recently worked in industries like Transportation, Information Technology, and Agriculture.
Deniel has recently worked in business areas like Information Technology, Product Development, and Business Intelligence.
Deniel holds a Bachelor in Computer Science from University of Southern Denmark / Hochschule Mannheim.
Deniel is immediately available for suitable projects.
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Calculated based on our freelancers’ daily rates as of 3 Oct 2026. Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.
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