Tobias Harth - Senior Fullstack Web and Mobile Developer

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Available

Seeg, Germany

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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 are first checked against the API, with a fallback to local SQLite data in case of network issues, including complete access policy evaluation (zone, direction, scan limits)
Developed a native iOS RFID bridge: connected the proprietary RFID SDK (QuantumSDK) via a custom Expo Config Plugin + Native Module; integrated LineaPro Bluetooth scanner hardware
Implemented real-time updates via WebSocket (Pusher protocol), including private-channel authentication and reconnect with exponential backoff for device-/gate-/event-based configuration changes
Designed a 3-level persistence setup (Keychain/MMKV/SQLite) for secure credentials, high-performance state and offline-capable scan/credential data
Implemented incremental credential sync (Cursor + updated_after) as well as batch upload of scan logs after reconnect to ensure consistent data in field operations

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 customers in the live entertainment/event industry
Built an Expo-managed React-Native app (Ignite Boilerplate) with a feature-sliced structure as well as state management with Zustand and persistence via MMKV
Implemented authentication (E-mail/CrewID) and secure token storage in the native Keychain
Developed core product features: event selection across multiple customer organizations, dynamic home feed, crew updates and customer-specific quick actions
Implemented operations/travel logistics including flights, accommodations, ground transport, visa status and accreditation with QR code and pickup tracking
Set up monitoring/debugging and delivery: Sentry, Reactotron, Push Notifications (Expo + FCM) as well as builds/distribution via EAS (dev/preview/prod) in the App Store & Google Play

Apr 2025 - Present

1 year 8 months

Senior Frontend Developer

Mediengruppe RTL Deutschland

Further developed and ensured the operational stability of the RTL+ big-screen apps for Samsung Tizen, Amazon Vega OS and MagentaTV set-top boxes as part of the team
Developed features, fixed bugs and improved stability across all app areas (including profiles, parental control, playback, navigation and 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 as well as platform-specific adaptations for each target
Integrated and maintained the player provided by RTL as well as the platform-dependent integration (including Vega OS via React-Native Wrapper/WebView)
Implemented and maintained key product features such as multi-profile, parental control and Deezer integration for music/podcasts
Collaborated on releases and QA within the existing setup: GitLab CI/CD, semantic-release and error tracking via Bugsnag
Solved typical big-screen challenges such as focus/remote navigation and performance/stability on weaker hardware

Apr 2025 - Present

1 year 8 months

Lead Developer & Architect

SNIPES

Architected and developed a cross-platform React-Native e-commerce app (Expo SDK 54, TypeScript) for SNIPES; rollout for iOS/Android in 8+ markets and 9 languages
Designed a modular feature architecture (modular monolith) with 25+ domain modules and established standards/patterns that enable parallel development in a 5-person team
Implemented the central technical foundation: app startup & initialization, deep/universal link routing, consent management (GDPR), locale detection and analytics bootstrapping
Implemented core integrations: Emarsys, Adjust, Firebase and Sentry, including 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 the release process
Increased stability and quality through Sentry monitoring, performance optimizations, code reviews and CI gates; achieved >99,5% crash-free in production

Dec 2024 - Feb 2025

3 months

Senior Frontend Developer

Fashion Company

Optimized the performance of the existing online shop
Implemented unit and E2E tests
Further developed the shop

Nov 2022 - Sep 2024

1 year 11 months

Senior Fullstack Developer

Client from the Semiconductor Industry

Consulting and support for the use of Vue.js, Nuxt and NestJS
Set up a multi-package repository with internal version management
Introduced a new pattern library based on Vue.js for company-wide use in marketing and application development
Developed a Nuxt framework with layer functionality for the fast and consistent creation of new applications
Developed various Nuxt modules and other libraries for applications and tools
Developed various applications for internal use in semiconductor production
Implemented a backend with NestJS using MSSQL and MongoDB
Designed CI/CD pipelines in Azure DevOps for automated versioning and changelog creation

Jan 2022 - Present

4 years 11 months

Senior Frontend Developer

Smatched - Survey Portal

Developed a Nuxt application for a survey portal
Focus on the portal clients through which users complete surveys
Used Nuxt's layer structure to standardize multiple portals
Implemented a core layer as the central functional foundation
Used feature toggles to flexibly enable/disable functions and customize the theming

Jun 2021 - Mar 2022

10 months

Frontend Developer

Stellenwerk | Launchlytics GmbH

Responsive redevelopment of the job portal
Redevelopment of the booking process
Optimization for SSR

Feb 2021 - Nov 2021

10 months

Mobile Developer

Smatched - Survey Portal

Developed 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 display, playtime analytics, reward distribution and integration of external surveys (Lucid) via WebView) to increase engagement and monetization
Designed a modular startup/interceptor architecture: sequential modal flow (backend configuration, onboarding, tracking consent) to control the first-launch flow and meet compliance requirements
Integrated and operated several third-party services: Sentry, AppsFlyer, Firebase Cloud Messaging, AdMob and Pollfish
Set up a GitLab CI/CD pipeline to automate linting & type checks, Android builds, Play Store releases and release creation from changelogs
In-app shop & rewards system: product catalog, purchases, product codes and purchase history – linking user activity to specific rewards
Gamification system: levels, XP, coins, loot boxes and tier-based progression system to increase engagement and retention

Jun 2020 - Jul 2022

2 years 2 months

Senior Fullstack Developer

Mediengruppe RTL Deutschland | TVNOW/RTL+

Redeveloped a whitelabel React streaming app for RTL+, optimized for televisions
Optimized for HbbTV, additional set-top boxes and Smart TVs
Developed a BFF based on NestJS for optimized data delivery
Developed additional HbbTV applications
AWS as infrastructure as code
Optimized the GitLab CI/CD

Jan 2020 - May 2020

5 months

Vue.js Specialist, Frontend Consulting

Gothaer Konzern

Responsive redevelopment of tariff-quote-request (TAA) calculators based on an SPA
Collaboration with the design team to coordinate feasibility
Development of a component-based pattern library
Onboarding and advising 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
Redevelopment of the entire flight booking process for Eurowings Aviation GmbH based on Vue.js and ES6
Collaboration with the specialist departments, especially the AEM department
Close collaboration with the frontend architecture team on the further development of the SPA core of the booking process

Feb 2018 - Jul 2018

6 months

Frontend Developer

justpeople GmbH | Sense & Image GmbH

Redevelopment of the justpeople GmbH applicant portal as an SPA
Close collaboration with the client
Close collaboration with the backend team to coordinate contracts
Development of an extensive frontend architecture based on 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

Development of various website projects
Coordination and close collaboration with METRO IT regarding website hosting
Multilingual implementation and development
Privacy-compliant implementation of forms and other features

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 developing high-performance, scalable web and mobile applications with React.js/Next.js and Vue.js/Nuxt.js, with strong expertise in NestJS for robust backend solutions. Additional expertise in cross-platform app development with React Native (Expo) – from initial concept to stable release.

Skills

My Technical Focus Areas:

Mobile Development: React Native, Expo, Typescript, Ios & Android, Eas Build/Update, Native Modules, Offline-First Architectures, Push Notifications
Frontend Development: React.Js, Next.Js, Vue.Js, Nuxt.Js, Typescript, Javascript, Tailwind Css, Zustand, Pinia
Backend Development: Node.Js, Nestjs, Rest Apis, Graphql, Typeorm, Sql/Nosql, Postgresql/Postgis, Mongodb
Software Architecture: Scalable Application Architectures, Modular Monoliths, Monorepos (Nx, Pnpm), Design Systems, Component Libraries, Ssr, Performance Optimization
Devops & Quality Assurance: Docker, Kubernetes, Aws, Azure Devops, Gitlab Ci/Cd, Automated Releases, Jest, Vitest, Playwright, Maestro, Sentry
Ai-Assisted Development: Openai Codex, Claude Code, Specialized Ai Agents, Mcp Integrations And Agent-Assisted Development Workflows

What Sets Me Apart: I Combine Deep Technical Expertise With High Standards For Software Architecture, Maintainability, Performance And Product Quality. In Addition To Classic Fullstack Development, My Strengths Include Independently Building Complex Applications, Defining Technical Standards And Taking On Architecture And Lead Responsibilities.

My Project Experience Ranges From International Mobile Commerce Platforms And Enterprise Applications To Streaming Apps For Smart Tvs As Well As Complex Web Platforms And Backend Systems.

Languages

German

Native

English

Intermediate

Education

Sep 2014 - Jan 2016

Sevenval Technologies GmbH

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

Statistics

Experience

Total positions 15

Experience in Information Technology 6 y

Avg length 1 y 2 m

Longest experience 4 y 10 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

Member since

March 2026

Last update

October 2026

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Frequently asked questions

Have questions? Find more information here.

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

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

Tobias has at least 9 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.

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

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

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

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

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

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

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

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

Tobias is immediately available full-time for suitable projects.

Daily rate distribution

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<€800 €800-1200 €1200-1600 €1600+

The rates shown represent the typical market range for freelancers in this position based on recent contracts on our platform.

Average rates for similar positions

Rates are based on recent contracts and do not include FRATCH margin.

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Daily rate avg. 1070 €

The average daily rate is the mean of all daily rates from recent contracts of comparable freelancers on our platform.

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Median rate 1020 €

The median daily rate is the middle value of all daily rates — half of comparable freelancers charge less, half charge more. Unlike the average, it is barely affected by outliers.

Calculated based on our freelancers’ daily rates as of 6 Nov 2026. Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.