Available for freelance work

I build

Freelance backend developer with over 15 years of experience. I support startups, agencies, and SMEs in building robust, scalable web applications.

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ABOUT ME

Experienced.Solution-oriented.

Andreas Kunisch

I am a freelance software developer based in Leipzig with over 15 years of professional experience in web development. My focus is on PHP with Symfony and Laravel – developing custom web applications that are clean, maintainable, and performant.

What sets me apart is the combination of deep technical expertise with a pragmatic, solution-oriented approach. Whether greenfield project or legacy modernization – I deliver quality that lasts.

Prior to freelancing, I led an IT department with personnel responsibility, developed booking systems for a travel platform, and built news portals with mobile applications. This diverse background enables me to understand both technical and business requirements.

Andreas Kunisch
Freelance Backend Developer
15+ YearsProfessional development experience
PHP ExpertSymfony & Laravel specialist
LeadershipFormer Head of IT Infrastructure
Full StackBackend focus with DevOps expertise

Interested in working together?

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WHAT I DO

Services

From backend development to DevOps – comprehensive solutions from a single source

Backend Development

Custom web applications with PHP, Symfony, and Laravel. Clean code, robust architecture, and APIs that scale with your business.

PHPSymfonyLaravelDoctrineMySQL

API Development & Integration

Design and implementation of RESTful APIs. Integration of third-party services and connection of frontend clients with backend systems.

RESTJSONOAuthWebhooksOpenAPI

CI/CD & DevOps

Automated deployment pipelines for faster, more reliable releases. Docker containerization and infrastructure optimization.

GitLab CIDockerKubernetesGitHub ActionsWoodpecker

Quality Assurance

Static code analysis, automated testing, and code style enforcement. Ensuring maintainable, error-free code through established quality tools.

PHPUnitPHPStanPHPCSTDDCode Review

Legacy Modernization

Refactoring and modernization of existing applications. Step-by-step improvement of maintainability, performance, and architecture.

RefactoringMigrationDocumentationArchitecture

Technical Consulting

Advice on architecture decisions, technology selection, and best practices. Supporting informed technical decisions for your project.

ArchitectureCode ReviewBest PracticesDocumentation

Need support? Let's talk about it.

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EXPERTISE

Tech Stack

Technologies I work with on a daily basis

Backend

API & Security

Databases

Messaging

DevOps

Cloud & Infrastructure

Tools

Mobile

Analytics

Methods

PROJECTS

Experience

Selected projects and positions from my professional career

01Travel

Travel Booking Platform

Development and maintenance of scalable backend services for booking and reservation systems. Focus on performance, stability, and seamless integration with external partners.

Key Contributions
Scalable backend services for booking systems
High-performance REST APIs for frontend and partners
Legacy code refactoring for improved maintainability
SymfonyDockerKubernetesMySQLnginx
02Media

News Portal

Full-stack development of an online news portal including REST APIs for content distribution. Additionally responsible for email newsletter campaigns and server administration.

Key Contributions
News portal with REST API architecture
Email newsletter system and campaigns
Linux server administration and maintenance
LaravelElasticsearchMySQLDebiannginx
03Medical Technology

Sales App

Development of a cross-platform mobile app for sales representatives to manage customer data, offers, and product information for medical devices.

Key Contributions
Cross-platform app with Flutter
Offline synchronization for field staff
Integration with existing CRM system
FlutterLaravelREST APIsMySQL
04Healthcare

IT Infrastructure

Conceptual and operational development of a highly available Linux-based IT infrastructure for an established service provider in the healthcare sector.

Key Contributions
Highly available MariaDB database systems (Galera Cluster)
Backup & recovery concepts for critical systems
Server hardening and security concepts
DebianMariaDBGalera-ClusterVMwareHA-Proxynagios
05Healthcare

Head of Data Operations

Leading a team responsible for the smooth and secure transfer and import of several million records daily between numerous business clients.

Key Contributions
Encrypted communication channels for secure data exchange
Automation of import processes
Monitoring, metrics, and alerting for critical processes
BashMySQLLinuxnagios
06Automotive

Car Dealership Website

Development of a modern web presence for a car dealership with automated vehicle listing integration and custom content management system.

Key Contributions
Integration of mobile.de API for live vehicle listings
Custom admin panel for content management
SEO-optimized vehicle detail pages with image galleries
LaravelREST APIsMySQLnginx
FAQ

Frequently AskedQuestions

Still have questions? I look forward to your message.

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GET IN TOUCH

Let's worktogether

Do you have a project in mind? I look forward to hearing from you.

WHY WORK WITH ME
  • Over 15 years of hands-on experience
  • Direct communication without intermediaries
  • Flexible engagement: hourly, daily, or project-based
  • Quality-focused code that stands the test of time

I usually respond within 24 hours