Alois Rietzler - Freelance Senior Fullstack Developer

Q: Where is Alois based?

Alois is based in Berlin, Germany .

Q: What languages does Alois speak?

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

Q: How many years of experience does Alois have?

Alois has at least 21 years of experience. During this time, Alois has worked in at least 10 different roles and for 19 different companies . The average length of individual experience is 1 year and 10 months . Note that Alois may not have shared all experience and actually has more experience.

Q: What is Alois's latest experience?

Alois's most recent position is Senior Fullstack Developer at brandung GmbH .

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

In recent years, Alois has worked for brandung GmbH , VIER / vier.ai , Bastei Lübbe / LYX Verlag , Bastei Lübbe , and RB Leipzig .

Q: Which industries is Alois most experienced in?

Alois is most experienced in industries like Information Technology , Professional Services , and Media and Entertainment . Alois also has some experience in Education , Healthcare , and Sport .

Q: Which business areas is Alois most experienced in?

Alois is most experienced in business areas like Information Technology , Product Development , and Marketing . Alois also has some experience in Operations , Strategy , and Quality Assurance .

Q: Which industries has Alois worked in recently?

Alois has recently worked in industries like Sport , Media and Entertainment , and Information Technology .

Q: Which business areas has Alois worked in recently?

Alois has recently worked in business areas like Information Technology , Product Development , and Operations .

Recommended expert

Berlin, Germany

Check rate

Experience

Jul 2025 - Dec 2025

6 months

Senior Fullstack Developer

brandung GmbH

Opt-in RAG extension over tenant-owned data sources (SharePoint, Confluence) on existing multi-tenant enterprise AI platform
Architecture: ADRs, solution evaluations, permission strategy, cost modeling
End-to-end SharePoint and Confluence connectors: OAuth consent flows, token refresh, metadata sync, search integration
Permission resolution: ACL indexing at ingestion and query-time verification (document-level security)
Elasticsearch hybrid search (semantic + keyword) with RRF scoring
RAG chat with context injection and source citations
Stack: Elastic Cloud, Elasticsearch, Docker, Northflank, Next.js, React, TypeScript, Prisma, Microsoft Graph API, Atlassian REST API, OAuth 2.0

Apr 2025 - Dec 2025

9 months

Senior Fullstack Developer

brandung GmbH

End-to-end relaunch of B2B e-commerce coaching platform with Payload CMS 3 and PostgreSQL
Responsibility from initial scaffold to production-ready application
Schema design, local API and revalidation hooks in Payload CMS
Course catalog and mentor directory listing/detail pages
Modular page builder with 12 reusable content blocks
Live preview for content editors
Vercel deployment including CI/CD, database migrations, blob storage
Stack: Payload CMS 3, Next.js 16, React 19, TypeScript, Tailwind CSS, Vercel Postgres/NeonDB, Vercel

Feb 2025 - Sep 2025

8 months

Senior Fullstack Developer

brandung GmbH

Relaunch of multi-domain platform for 200+ fitness studios in Germany and Austria with Contentful and Next.js
Solo content modeling in Contentful: content types and relations for studios, pages, lead forms; DE/AT localization
Multi-domain architecture with domain resolution layer, sitemap/robots/canonical, cross-domain preview mode
Contracts cancellation and trial training forms with React Hook Form, Zod, Server Actions
Studio finder enhancement with geolocation and cross-border search
Four transactional email templates with React Email
Stack: Next.js 15, React 19, TypeScript, Contentful (GraphQL + Codegen), Vercel (Preview), Resend, React Email, Google Maps API, Zustand

Jan 2025 - Dec 2025

1 year

Backend & Integration Developer

brandung GmbH

Proof of Concept spike for B2B customer portal with Chargebee subscription management backend in Next.js
Next.js API routes for Chargebee portal session creation and callback handling
Middleware for session validation and route protection
Initial Chargebee API integration
Stack: Chargebee API, Next.js, React, TypeScript, Vercel

Aug 2024 - Jun 2025

11 months

Senior Fullstack Developer

VIER / vier.ai

Consolidation of corporate website from predecessor agency in 6-person team
Refactoring Contentful client layer into dedicated query modules
Enhancing site-wide search: ranking, deduplication, multi-term logic, parallel queries, cache headers, Next.js 15 compatibility
Contentful taxonomy feature implementation and integration in Next.js fetching layer
Performance optimizations: include-depth control for Contentful queries
Content validation framework enhancements: new validators, logging
Stack: Contentful (JS SDK, CDA), Next.js 15, React 19, TypeScript, Vercel

Apr 2024 - Jan 2025

10 months

Senior Fullstack Developer

Bastei Lübbe / LYX Verlag

Solo build of giveaway and voting platform replacing legacy PHP for multiple publishing brands
Initial implementation on Payload CMS v2: domain model as collections, custom hooks for validation and PII encryption, custom API endpoints for voting and registration flows
Major migration from Payload v2 to v3 with added voting feature
AES-256 field-level encryption for PII (GDPR compliant)
Multi-tier security with RBAC and API key authentication
Password-protected Excel export with server-side decryption
Platform migration from Platform.sh/PostgreSQL to Vercel/Vercel Postgres
Monitoring with Sentry and CVE remediation
Stack: Payload CMS v2 → v3, Next.js, TypeScript, Jest, Platform.sh → Vercel, PostgreSQL → Vercel Postgres/NeonDB, devenv (Nix)

Jan 2024 - Dec 2025

2 years

Senior Developer, Operations & Consulting

Bastei Lübbe

Ongoing platform operations and strategic consulting post e-commerce storefront launch
Monitoring B2C storefront: incident analysis, Vercel WAF configuration
Maintenance of B2B Neos CMS platform: minor CMS adjustments, EQS importer job maintenance
Email delivery migration from SMTP to Postmark API
Honeypot spam protection for contact forms
Contentful consultancy: capabilities, pricing implications, content modeling, operations, space architecture, Payload comparison
Stack: Vercel observability and WAF, Neos CMS 8.3, PHP 8.1, Neos Flow Framework, Postmark API

Jan 2023 - Dec 2025

3 years

Senior Fullstack Developer

Bastei Lübbe

Development of composable e-commerce storefront frontend with Next.js, Shopware 6 backend, and Contentful CMS
Backend and integration contributions in frontend team
Solo responsibility for Contentful custom app suite enabling editors to access Shopware product data in Contentful editor
Wishlist integration using Server Actions and Shopware 6 Store API
B2B corporate section with multilingual routing
EQS financial news filtering initial implementation
URL resolution API (ISBN/contributor/collection to SEO URLs via Shopware)
Four custom Contentful picker apps bridging Contentful and Shopware 6 product data
Stack: Next.js 15, React 19, React 18 (Contentful picker apps), TypeScript, Shopware 6 API, Contentful App Framework, Vercel

Jan 2023 - Apr 2023

4 months

Senior Backend Developer

RB Leipzig

Independent build of headless CMS backend for "Bullis Bande" kids fan club mobile app
GraphQL schema, PHP model layer (~57 classes), custom node types (~41)
Redis as primary cache backend with asynchronous cache warming
Batch Opta sports data import and domain model importer
Neos CMS migration from 7.3 to 8.2 with core patches
Solo development of news and Opta modules, code reviews and QA for team modules
Stack: Neos CMS 8.2, PHP 8.1, GraphQL, Redis, MariaDB, AWS S3, Flownative Beach, Behat

Jun 2021 - Jun 2021

1 month

Senior Backend Developer

Ferrero

Backend work on Nutella "We Love Summer" campaign platform
Deployment on Ferrero’s internal iPaaS multi-environment setup
phpCAS library migration in PHP SSO service with bugfix for service URL handling
Extension of DB-backed session handler for load-balanced environment with dynamic config reload per query and session ID length bugfix
Implementation of bearer token helper for post-login email sending
Critical bug fixes during test→qual/prod transition
jQuery glue between SSO backend and frontend
Stack: PHP, phpCAS, MySQL (PDO), bearer-token auth, jQuery

Sep 2020 - Apr 2023

2 years 8 months

Senior Backend Developer (Neos Lead)

RB Leipzig

Lead Neos CMS development of headless multi-channel platform for website and mobile app with high-frequency publishes and cache invalidation
Initial platform setup from first commit, continuous main committer in 8-person team
Cross-platform content delivery (DE/EN)
Queue worker infrastructure for API cache backend (Redis/PDO) with stale-while-revalidate, environment-based scaling, backend management module
Opta/DFB media sports data integration and maintenance
Member event management in SSO-protected area
Kubernetes PaaS configuration on Flownative Beach
Platform upgrades: Neos 5→8, PHP 7→8.1
Production optimizations: Elasticsearch search fallback, queue deduplication, lock handling
Stack: Neos CMS 5/7/8 (headless), Flow Framework, PHP 8.1, GraphQL, Elasticsearch, Redis, MySQL/MariaDB, AWS S3, Flownative Beach, Behat, PHPUnit, GitLab CI

Jul 2019 - Oct 2019

4 months

Senior Backend Developer

McFIT / RSG Group

Development of multi-country competition platform for five countries
Domain architecture with Doctrine entities and repositories
Denormalized ranking engine with batch sync and job queue
Planned aggregated leaderboards via command controller and scheduler task
Multi-tenant backend admin with RBAC and studio-scoped visibility for CRUD modules
Five-language support (DE/EN/ES/IT/PL)
Stack: Neos CMS 4.3, PHP 7.2, Flow Framework 5.3, Doctrine ORM, MySQL, Flowpack JobQueue, Deployer

May 2019 - Jun 2019

2 months

Backend Developer

Medizinische Hochschule Hannover

Founding developer of TYPO3 sitepackage platform
Setup repository, sitepackage scaffolding, project structure, ddev configuration
Content modeling with Mask: 16 custom content elements and backend layouts
Deployer setup for Rancher environments
Stack: TYPO3 CMS 9.5, Fluid, Mask, PHP 7.2, Deployer, Rancher

Jun 2018 - Feb 2019

9 months

Backend Developer

Klinikum Augsburg

Auth owner for intranet/extranet fork of TYPO3 sitepackage template
Dual-mode login with IP range detection, custom password reset with security question, xclass override for FrontendLoginController
Contributions to registration, profile, password reset via FEManager
Content modeling with Mask and TCA overrides
TYPO3 7.6→8.7 LTS migration and darksite finalization
Stack: TYPO3 CMS 7.6/8.7, PHP 7, Extbase/Fluid, FEManager, Mask

Jan 2018 - Dec 2018

1 year

Backend Developer

ALBA BERLIN

Relaunch of basketball club website with sports data integration from BBL and Euroleague APIs
Design and setup of basketball manager extension: custom domain models, import trigger backend module, scheduler-based importers
Solo development of BBL importer and sports data pipeline as scheduled batch
Implementation of 17 custom content elements and backend layouts with Mask
CleverReach integration via TypoScript
Stack: TYPO3 CMS, Extbase/Fluid, PHP, JavaScript, CleverReach, Deployer, GitLab CI

Nov 2017 - Dec 2019

2 years 2 months

Backend Developer

Bausparkasse Mainz

Relaunch of web platform across five repositories with TYPO3
ADM extension for field staff and real estate offers: custom Extbase setup, ImmoData XML pipeline, AdWords tracking, LocalBusiness structured data
Initial TypoScript architecture
Content modeling with Mask: 21 custom content elements
SEO ownership: JSON-LD breadcrumbs, robots.txt, sitemap, header types
Hero module for loan calculators
Deployer setup with stage splits across repositories
Stack: TYPO3 CMS, Extbase/Fluid, TypoScript, PHP, Mask, Deployer, GitLab CI

Jun 2017 - Sep 2020

3 years 4 months

Backend Developer

Save the Children Deutschland e.V.

Development of digital web platform and online donation shop with FundraisingBox integration
Donation shop extension: product catalog, occasion model, iFrame/webhook integration, PDF download for donation certificates
Website content modeling with Mask (~35 custom content elements) and template integration
Contributions to newsletter extension: popup, double opt-in, privacy statements
Usercentrics consent integration (GDPR)
Consolidation of tracking stack (GA, Piwik) under Google Tag Manager
Stack: TYPO3 CMS 8.x, Extbase/Fluid, PHP, FundraisingBox, Google Tag Manager, Usercentrics, Deployer, GitLab CI

Feb 2017 - Sep 2020

3 years 8 months

Backend Developer

Universitätsklinikum Regensburg

Core contributor to intranet portal with two web applications
Custom Extbase extensions: bulletin board, directory
Content modeling: ~15 custom content elements
Co-contributions to events, site search, forms modules
Lead TYPO3 v8→v9 migration with Rector automation across 6+ extensions
Maintenance of custom scheduler tasks for enterprise data imports
Infrastructure: deployer pipelines, composer/build setup, ddev configuration
Stack: TYPO3 CMS v8/v9, PHP 7.2, Extbase/Fluid, Mask, Deployer, Rector, GitLab CI

Jan 2017 - Dec 2018

2 years

Backend Developer

Pyrexx GmbH

Development of multilingual corporate website with interactive FAQ section
Owner of FAQ rating plugin with thumbs up/down and suggestions via REST API
Co-contributions: multilingual footer, hero variant selection, CTA button, text media wrapper
Stack: TYPO3 CMS 7.6, Extbase/Fluid, JavaScript (AJAX), Mask, REST API

Jan 2016 - Jul 2019

3 years 7 months

Backend Developer

Salus Group

Lead developer of multi-site web platform across eight domains and intranet
Solo initial author of job portal and main author of clinic & specialist finder
Intranet with IP-based access control via TypoScript whitelist
Content modeling: 20 custom content elements via TCA overrides, 8 custom data processors solo
Lead TYPO3 7→8.7 migration
Stack: TYPO3 CMS 7/8.7, Extbase/Fluid, PHP 7, Mask, FEManager

Sep 2015 - Nov 2018

3 years 3 months

Backend Developer

Labor Dr. Wisplinghoff

Main developer/owner of data integration extension for medical diagnostics lab platform
Insigma XML import pipeline for public analysis directory with search, filtering, caching, SEO optimization
Patient results system with Medat LDT parsing and authentication
Custom cache warmer for proactive cache warming
Content modeling with DCE and Gridelements (17 templates)
Stack: TYPO3 CMS, Extbase/Fluid, PHP, XML/LDT data integration, TYPO3 caching framework

Jan 2014 - Dec 2015

2 years

Frontend Developer

HTW Berlin

Reference implementation for responsive and accessible relaunch of university website using Pattern Lab
Atomic design-based modular frontend architecture with Mustache/JSON modules
Theming and responsive layouts preparation for TYPO3 integration
Stack: Pattern Lab PHP, Mustache, HTML, CSS/SASS, JavaScript/jQuery

Aug 2012 - Mar 2015

2 years 8 months

Freelance Fullstack Developer

With Wings and Roots

Solo end-to-end implementation of international documentary film educational web platform
Interactive story collection with timeline, video library with filtering and custom modal player
Vimeo integration: restricted videos and user uploads via Vimeo API
Stack: WordPress, PHP, jQuery, Vimeo API, Foundation 3, TimelineJS, Isotope

Sep 2011 - Apr 2014

2 years 8 months

Student Assistant

HTW Berlin

Student assistant at university computing center during media informatics studies
Web development with TYPO3, Java development, Neos CMS evaluation, IT support and administration
Stack: TYPO3, Java, PHP, HTML/CSS

Dec 1999 - May 2006

6 years 6 months

Information Analyst

EDS / HP Global Account

Progressed from Business Representative to IT Systems Clerk, Information Associate, and Information Analyst
Developed and maintained internal business applications in international team
Monitoring systems and reporting tools, PDF invoicing with metadata search, HTTPS web service on VAX OpenVMS
Stack: Perl, PHP, Java, MySQL, XML/XSL, IIS, Apache, VAX OpenVMS, CVS

Industry Experience

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

Experienced in Information Technology, Professional Services, Media and Entertainment, Education, Healthcare, and Sport.

Information Technology

Professional Services

Media and Entertainment

Education

Healthcare

Sport

Business Area Experience

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

Experienced in Information Technology, Product Development, Operations, Strategy, Marketing, and Quality Assurance.

Information Technology

Product Development

Operations

Strategy

Marketing

Quality Assurance

Summary

Senior Fullstack Developer with a focus on Headless CMS (Payload, Contentful) and AI/RAG architecture. 15+ years of backend experience, ten of which were in a Berlin digital agency (six as Senior). Solo end-to-end or with a backend/integration focus in a team; proficient in PHP (Neos Flow) and Node.js/TypeScript (Next.js).

Current focus: Payload CMS as an application framework, AI/RAG architecture (Enterprise Search, RAG Chat), and agentic coding with custom tooling.

Available for: platform development (Headless CMS, AI/RAG), system integration & auth, project takeovers & migrations, consulting & sparring.

Skills

Backend & Api

Typescript
Node.js
Next.js (App Router, Server Actions, Api Routes)
Payload 3 (Hooks, Access Control, Jobs)
Prisma
Rest
Graphql
Webhooks
Php (Neos Flow Framework)

Ai & Search

Elasticsearch (Keyword, Semantic, Hybrid)
Rag (Context Injection, Source Citations)

Auth & Security

Oauth 2.0
Sso (Phpcas)
Rbac
Field-level Encryption (Aes-256, Pii/gdpr)
Api Key Auth
Document-level Security
Multi-tenant Auth

Frontend

Html/css/js
React
Next.js
Typescript
Tailwind Css
Shadcn/ui
Radix Ui
Fusion/afx (Neos)

Data & Infra

Postgresql
Mysql
Redis
Elasticsearch
Docker
Linux Servers
Vercel
Northflank
Platform.sh
Flownative Beach
Aws S3
Gcs
Github Actions
Gitlab Ci
Deployer

Cms Platforms

Payload Cms
Contentful
Neos

Quality & Tooling

Playwright
Jest
Eslint
Prettier
Phpunit
Behat
Phpstan
Psalm
Rector
Ddev
Nix/devenv

Foundation

Wordpress (Pods)
Typo3 (Extbase)
Jquery
Foundation
Bootstrap
Sass
Pattern Lab (Atomic Design, Bem)
Fluid

Agentic Coding Custom Tooling For Agentic Software Development:

Yoyo — Execution Harness That Runs Coding Agents (E.g. Claude Code) In Limited Iteration Loops With Test Gating Between Steps; Orchestrates Project-specific Devenv Services For Agent Runs (Go · Nix/devenv)

Limbo — Nix-based Oci Sandbox Image As A Reproducible, Isolated Execution Environment For Agent Runs, Running Project-specific Devenv Setups (Nix · Devenv · Oci · Apple Container/podman)

Languages

German

Native

English

Advanced

Education

Oct 2007 - Jun 2014

Berlin University of Applied Sciences for Engineering and Economics

B.Sc. in Media Informatics · Media Informatics · Berlin, Germany

Certifications & licenses

Contentful Certified Professional

Instructor Qualification (IHK)

Vocational Instructor Certificate

Advanced Training Flash and PHP Developer

Macromedia Academy for Media

Statistics

Experience

Total positions 25

Experience in Information Technology 9.5 y

Avg length 1 y 9 m

Longest experience 6 y 5 m

Expertise

Recent roles Senior Fullstack Developer, Backend & Integration Developer, Senior Developer, Operations & Consulting

Main industries Information Technology, Professional Services, Media and Entertainment

Main business areas Information Technology, Product Development, Operations

Qualifications

Highest degree Bachelor

Certifications earned 4

Profile

Created

May 2026

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Frequently asked questions

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

Where is Alois based?

Alois is based in Berlin, Germany.

What languages does Alois speak?

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

How many years of experience does Alois have?

Alois has at least 21 years of experience. During this time, Alois has worked in at least 10 different roles and for 19 different companies. The average length of individual experience is 1 year and 10 months. Note that Alois may not have shared all experience and actually has more experience.

What roles would Alois be best suited for?

Based on recent experience, Alois would be well-suited for roles such as: Senior Fullstack Developer, Backend & Integration Developer, Senior Developer, Operations & Consulting.

What is Alois's latest experience?

Alois's most recent position is Senior Fullstack Developer at brandung GmbH.

What companies has Alois worked for in recent years?

In recent years, Alois has worked for brandung GmbH, VIER / vier.ai, Bastei Lübbe / LYX Verlag, Bastei Lübbe, and RB Leipzig.

Which industries is Alois most experienced in?

Alois is most experienced in industries like Information Technology, Professional Services, and Media and Entertainment. Alois also has some experience in Education, Healthcare, and Sport.

Which business areas is Alois most experienced in?

Alois is most experienced in business areas like Information Technology, Product Development, and Marketing. Alois also has some experience in Operations, Strategy, and Quality Assurance.

Which industries has Alois worked in recently?

Alois has recently worked in industries like Sport, Media and Entertainment, and Information Technology.

Which business areas has Alois worked in recently?

Alois has recently worked in business areas like Information Technology, Product Development, and Operations.

What is Alois's education?

Alois holds a Bachelor in Media Informatics from Berlin University of Applied Sciences for Engineering and Economics.

Does Alois have any certificates?

Alois has 4 certificates. Among them, these include: Contentful Certified Professional, Instructor Qualification (IHK), and Vocational Instructor Certificate.

What is the availability of Alois?

Alois will be available from May 2026.

What is the rate of Alois?

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