Tobias Harth - Freelance Fullstack Web & Mobile...

Q: Where is Tobias based?

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

Q: What languages does Tobias speak?

Tobias speaks the following languages: German (Native), English (Intermediate) .

Q: How many years of experience does Tobias have?

Tobias has at least 8 years of experience. During this time, Tobias has worked in at least 8 different roles and for 13 different companies . The average length of individual experience is 1 year and 7 months . Note that Tobias may not have shared all experience and actually has more experience.

Q: What is Tobias's latest experience?

Tobias's most recent position is Solo Mobile Developer at The Event Verse .

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

In recent years, Tobias has worked for The Event Verse , Mediengruppe RTL Deutschland , SNIPES , Fashion Company , and Client from the semiconductor industry .

Q: Which industries is Tobias most experienced in?

Tobias is most experienced in industries like Information Technology , Media and Entertainment , and Manufacturing . Tobias also has some experience in Retail , Aerospace and Defense , and Professional Services .

Q: Which business areas is Tobias most experienced in?

Tobias is most experienced in business areas like Information Technology , Product Development , and Quality Assurance .

Q: Which industries has Tobias worked in recently?

Tobias has recently worked in industries like Information Technology , Media and Entertainment , and Manufacturing .

Q: Which business areas has Tobias worked in recently?

Tobias has recently worked in business areas like Information Technology , Product Development , and Quality Assurance .

Recommended expert

Seeg, Germany

Experience

Oct 2025 - Nov 2025

2 months

Solo Mobile Developer

The Event Verse

Developed a new iOS access-control scanning app for security/gate staff to validate RFID wristbands/badges in real time
Implemented an online/offline hybrid architecture: scans first hit the API, with a local SQLite fallback for full access policy evaluation (zone, direction, scan limits) offline
Developed a native iOS RFID bridge: integrated a proprietary RFID SDK (QuantumSDK) via a custom Expo config plugin and native module; integrated with LineaPro Bluetooth scanner hardware
Implemented real-time updates over WebSocket (Pusher protocol) including private-channel auth and exponential backoff reconnect for device-/gate-/event-based configuration changes
Designed a three-tier persistence layer (Keychain/MMKV/SQLite) for secure credentials, fast state management, and offline-capable scan/credential data
Developed incremental credential sync (cursor + updated_after) and batch upload of scan logs after reconnect to ensure consistent field data

Aug 2025 - Nov 2025

4 months

Solo Mobile Developer

The Event Verse

Developed a new white-label crew management and operations app (iOS/Android) for enterprise clients in the live entertainment/event industry
Set up an Expo-managed React Native app (Ignite boilerplate) with a feature-sliced structure and state management via Zustand and MMKV persistence
Implemented authentication (email/CrewID) and secure token storage in the native keychain
Developed core features: multi-organization event selection, dynamic home feed, crew updates, and custom quick actions
Managed operations and travel logistics including flights, accommodations, ground transport, visa status, accreditation with QR codes, and pickup tracking
Configured monitoring/debugging and deployments: Sentry, Reactotron, push notifications (Expo + FCM), and builds/distribution via EAS (dev/preview/prod) to the App Store & Google Play

Apr 2025 - Present

1 year

Senior Frontend Developer

Mediengruppe RTL Deutschland

Enhanced and maintained the RTL+ big-screen apps for Samsung Tizen, Amazon Vega OS, and MagentaTV set-top boxes
Feature development, bug fixing, and stabilization across all app areas (profiles, parental control, playback, navigation, content flows), including support for legacy/low-end devices
Worked in an Nx/monorepo codebase (React 19, TypeScript, Next.js) with state management via Zustand/Context and platform-specific adjustments per target
Integrated and maintained the RTL-provided player and platform-specific embedding (e.g., Vega OS via React Native wrapper/WebView)
Developed core product features like multi-profile, parental control, and Deezer integration for music/podcasts
Collaborated on releases and QA using GitLab CI/CD, semantic-release, and Bugsnag for error tracking
Addressed big-screen challenges like focus/remote navigation and performance/stability on low-end hardware

Apr 2025 - Present

1 year

Lead Developer & Architect

SNIPES

Architected and developed a cross-platform React Native e-commerce app (Expo SDK 54, TypeScript) for SNIPES; rolled out to iOS/Android in 8+ markets and 9 languages
Designed a modular feature architecture (modular monolith) with 25+ domain modules, establishing standards/patterns for parallel development in a 5-person team
Implemented core technical foundation: app startup & initialization, deep/universal link routing, consent management (GDPR), locale detection, and analytics bootstrapping
Integrated key services: Emarsys, Adjust, Firebase, and Sentry with push lifecycle and iOS Notification Service Extension
Set up CI/CD with GitLab, semantic-release, and EAS build/update (OTA channels, automated store releases), significantly streamlining releases
Improved stability and quality through Sentry monitoring, performance optimizations, code reviews, and CI gates; achieved >99.5% crash-free rate in production

Dec 2024 - Feb 2025

3 months

Senior Frontend Developer

Fashion Company

Optimized performance of the existing online shop
Implemented unit and end-to-end tests
Continued development of the shop

Nov 2022 - Sep 2024

1 year 11 months

Senior Fullstack Developer

Client from the semiconductor industry

Consulting and support in using Vue.js, Nuxt, and NestJS
Setting up a multi-package repository with internal version control
Introducing a new pattern library based on Vue.js for company-wide use in marketing and application development
Developing a Nuxt framework with layer functionality for quick and consistent creation of new applications
Developing various Nuxt modules and other libraries for apps and tools
Developing various apps for internal use in semiconductor production
Implementing a backend with NestJS using MSSQL and MongoDB
Designing CI/CD pipelines in Azure DevOps for automated versioning and changelog generation

Jan 2022 - Present

4 years 3 months

Senior Frontend Developer

Smatched - Survey Portal

Developing a Nuxt application for a survey portal
Focusing on the portal clients where users conduct surveys
Using Nuxt's layer structure to unify multiple portals
Implementing a core layer as a central function base
Using feature toggles to flexibly enable or disable features and adjust theming

Jun 2021 - Mar 2022

10 months

Frontend Developer

Stellenwerk | Launchlytics GmbH

Responsive rebuild of the job portal
Redevelopment of the booking flow
Optimization for SSR

Feb 2021 - Nov 2021

10 months

Mobile Developer

Smatched - Survey Portal

Developing a cross-platform mobile app with React Native and Expo for iOS and Android, including an integrated in-app survey engine in a swipeable, card-based game flow (multi-step questionnaires with single/multiple choice, animated progress indicator, playtime analytics, reward distribution, and integration of external surveys (Lucid) via WebView) to increase engagement and monetization
Designing a modular startup/interceptor architecture: a sequential modal flow (backend configuration, onboarding, tracking consent) to manage the first-launch flow and meet compliance requirements
Integrating and operating multiple third-party services: Sentry, AppsFlyer, Firebase Cloud Messaging, AdMob, and Pollfish
Setting up a GitLab CI/CD pipeline to automate linting and type checks, Android builds, Play Store releases, and release creation from changelogs
In-app shop and reward system: product catalog, purchases, product codes, and purchase history – linking user activity to tangible rewards
Gamification system: levels, XP, coins, loot boxes, and a tier-based progression system to boost engagement and retention

Jun 2020 - Jul 2022

2 years 2 months

Senior Fullstack Developer

Mediengruppe RTL Deutschland | TVNOW/RTL+

Developing a white-label React streaming app for RTL+, optimized for TVs
Optimizing for HbbTV, other set-top boxes, and smart TVs
Developing a BFF based on NestJS for optimized data delivery
Developing additional HbbTV applications
Using AWS as infrastructure as code
Optimizing GitLab CI/CD

Jan 2020 - May 2020

5 months

Vue.js Specialist, Frontend Consulting

Gothaer Konzern

Responsive redevelopment of tariff quote request (TAA) calculators as an SPA
Collaborating with design to assess feasibility
Developing a component-based pattern library
Onboarding and mentoring developers in Vue.js
Frontend architecture of the TAA framework

Sep 2018 - Dec 2019

1 year 4 months

Frontend Developer

Eurowings | cyber:con GmbH

Responsive development of the existing website
New development of the entire flight booking flow for Eurowings Aviation GmbH using Vue.js and ES6
Collaborating with departments, particularly the AEM department
Close collaboration with the frontend architecture team on further development of the SPA core for the booking flow

Feb 2018 - Jul 2018

6 months

Frontend Developer

justpeople GmbH | Sense & Image GmbH

New development of the justpeople GmbH applicant portal as an SPA
Close collaboration with the client
Close collaboration with the backend team to align contracts
Designing an extensive frontend architecture using React with server-side rendering

Jan 2018 - May 2018

5 months

Employed Frontend Developer

Sense & Image GmbH

Oct 2017 - Jun 2018

9 months

Frontend Developer

METRO AG | Sense & Image GmbH

Developing various website projects
Coordinating and close collaboration with METRO IT on website hosting
Multilingual implementation and deployment
Implementing forms and other features in compliance with data protection regulations

Industry Experience

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

Experienced in Information Technology, Media and Entertainment, Retail, Manufacturing, Aerospace and Defense, and Insurance.

Information Technology

Media and Entertainment

Retail

Manufacturing

Aerospace and Defense

Insurance

Business Area Experience

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

Experienced in Information Technology and Product Development.

Information Technology

Product Development

Summary

Freelance Senior Fullstack Web & Mobile Developer with over 10 years of experience. Specialized in building high-performance, scalable web and mobile applications with React.js/Next.js and Vue.js/Nuxt.js, and proficient in NestJS for robust backend solutions. Also experienced in cross-platform app development with React Native (Expo) – from concept to stable release.

Languages

German

Native

English

Intermediate

Education

Sep 2014 - Jan 2016

Sevenval Technologies GmbH

Apprentice IT Specialist - Application Development · IT Specialist - Application Development · Cologne, Germany

Statistics

Experience

Total positions 15

Experience in Information Technology 5.5 y

Avg length 1 y

Longest experience 4 y 2 m

Expertise

Recent roles Solo Mobile Developer, Senior Frontend Developer, Lead Developer & Architect

Main industries Information Technology, Media and Entertainment, Retail

Main business areas Information Technology, Product Development

Profile

Created

March 2026

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Frequently asked questions

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

Where is Tobias based?

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

What languages does Tobias speak?

Tobias speaks the following languages: German (Native), English (Intermediate).

How many years of experience does Tobias have?

Tobias has at least 8 years of experience. During this time, Tobias has worked in at least 8 different roles and for 13 different companies. The average length of individual experience is 1 year and 7 months. Note that Tobias may not have shared all experience and actually has more experience.

What roles would Tobias be best suited for?

Based on recent experience, Tobias would be well-suited for roles such as: Solo Mobile Developer, Senior Frontend Developer, Lead Developer & Architect.

What is Tobias's latest experience?

Tobias's most recent position is Solo Mobile Developer at The Event Verse.

What companies has Tobias worked for in recent years?

In recent years, Tobias has worked for The Event Verse, Mediengruppe RTL Deutschland, SNIPES, Fashion Company, and Client from the semiconductor industry.

Which industries is Tobias most experienced in?

Tobias is most experienced in industries like Information Technology, Media and Entertainment, and Manufacturing. Tobias also has some experience in Retail, Aerospace and Defense, and Professional Services.

Which business areas is Tobias most experienced in?

Tobias is most experienced in business areas like Information Technology, Product Development, and Quality Assurance.

Which industries has Tobias worked in recently?

Tobias has recently worked in industries like Information Technology, Media and Entertainment, and Manufacturing.

Which business areas has Tobias worked in recently?

Tobias has recently worked in business areas like Information Technology, Product Development, and Quality Assurance.

What is Tobias's education?

Tobias attended Sevenval Technologies GmbH for IT Specialist - Application Development.

What is the availability of Tobias?

Tobias will be available full-time from April 2026.

What is the rate of Tobias?

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