REST API Experts in Leipzig
in minutes from over 15,000 CVs with the power of AI.Hire experts who design REST endpoints, structure JSON payloads, and connect services through secure, well-documented integrations. They support new APIs, refactoring of RESTful API layers, and clean handover for internal teams or clients. Get fast, precise matching with vetted, available freelancers.
Meet FRATCH Experts in Leipzig, who have recently used REST API
Thomas Polanski
Last position:
Project Manager & Product Owner – M&A Integration at voxa c/o IC Music and Apparel GmbH
- Project management of the legal and system-side integration of Taschenkaufhaus into the Voxa group: conversion of all contracts, accounts, and system access rights on the defined cutover date
- Migration from Microsoft Dynamics NAV 2009 to 2013: analysis of all existing interfaces, redefinition of processes, and coordinated go-live without interrupting operations
- Integration of the complaints and returns process into MS Dynamics NAV 2013; major process simplification through standardization
- Introduction of a new POS system (Shopify POS) in all stores: requirements analysis, configuration, rollout, and employee training
- Use of n8n automation workflows for data reconciliation between marketplaces and ERP; manual processes significantly reduced
Natascha Fadeeva-Gladbach
Last position:
Senior iOS Developer - ANÜ at Stadtwerke München GmbH
- Development of an iOS app that combines public transport and sharing services
- Collaboration in Scrum within a large cross-functional team
- Creation of reusable components with SwiftUI and Combine
- Development of custom solutions for Apple Maps
Frank Richter
Last position:
eCommerce Software Developer at WirTube-Shop
- Maintenance and system handover
- Planning and carrying out core and plugin updates
- Developing a plugin to extend invoice creation and payment via Flow Builder
Peter Teich
Last position:
Freelance Go-Developer/DevOps-Engineer at IONOS SE
- Implementation of an API for customers to provide NFS shares in the cloud
- Creating Kubernetes operators and services with REST APIs in Go
- Using LinuxKit for provisioning VMs
Sascha Weißbach
Last position:
Lead Product Owner CADKit at Ottobock SE
- Realignment and technical leadership of a CAD web platform for the global digitization of the prosthetics manufacturing process
- Translating the CPO's vision into a technical roadmap and leading an interdisciplinary team of developers, designers, and QA
- Implementing complex 3D interfaces using Vue.js and Three.js
- Global rollout of 8 scalable web apps, increasing production efficiency by 80%
Gwen Glaser
Last position:
Senior Ruby on Rails & DevOps Developer at Sapiens
Further development of a software solution for managing test requests and test notifications according to §106d SGB V for the Hamburg Association of Statutory Health Insurance Physicians.
- Developed numerous features, performance optimizations, refactoring, error analysis
- Refactored the dev container setup
- Optimized the GitLab CI build pipeline
- Contributed optimizations to the team workflow
Julian Haluska
Last position:
Working Student / Master's Thesis Student Software Development at Scale GmbH
- Tech-Stack: Python, Qt, tensorflow.js, plotly, Angular, TypeScript, HTML, CSS, Git
Mostafa Shawki
Last position:
Freelance Senior Software Engineer & AI Consultant at Self-employed
- Led the development of a complex geospatial data platform, engineering an end-to-end system for processing and analyzing high-resolution aerial imagery.
- Engineered a scalable backend responsible for on-the-fly map tile serving and running complex data analysis queries using PostGIS and Python.
- Developed and trained custom computer vision models using Python, PyTorch, and YOLOv8 to perform object detection and segmentation on large-scale datasets.
- Built modern, responsive user interfaces and data visualization dashboards using Next.js, TypeScript, and React.
- Gained practical expertise in geospatial libraries such as GDAL and Rasterio for processing and manipulating raster and vector data.
- Managed the entire project lifecycle, from initial technical architecture and database design to final deployment using Docker.
Knud Werner
Last position:
Lead Programmer, Architect and Deputy Product Owner at Bundesagentur für Arbeit
- Lead programmer, architect and deputy product owner
- Completed transition from zPDV to STEP
- Ensured quality of C++ and Perl sources through automated and manual checks
- Supported resolution of incidents and errors in testing
- Implemented batch for supplementary assignment of payment run numbers
- Implemented batch for distribution of SGB 2 information to the central payment unit
- Supported replacement of Solaris with Linux
- Upgraded gcc from 7.4 to 9.3
- Programmatically generated Makefiles from Borland projects for builds
- Extended funding data with new attribute “internship travel cost indicator”
- Programmatically generated XSD and WSDL files from IDL definitions
- Represented the product owner when needed
- Implemented batch for one-time payment processing
- Developed generator for Liquibase files
- Implemented and maintained regular anonymization of production data
- Supported migration from SLES 12 to SLES 15
- Supported introduction of mutual TLS
- Implemented batch for sending deletion impulses to EDA BE
- Organized script directory structure
- Investigated potential introduction of String-Latin and implemented minimal solution
- Remediated security findings identified by CheckMarx
- Supported PAP recalculations and general change notices
- Converted ERP interfaces from SOAP to REST
- Planned technical and business topics such as register modernization, cash register security, training costs, four-eyes principle
Jan Beckert
Last position:
API-Engineer at Freelance
- API-first product design (OpenAPI 3, HAL) and development (NodeJS)
- Setting up DevOps pipelines with GitHub Actions in an AWS architecture
- Technologies: OpenAPI 3, REST, HAL, NodeJS, JavaScript, TypeScript, AWS, AWS Lambda, Docker, GitHub Actions
Hannes Witt
Last position:
intermedix GmbH / CGM Deutschland AG
Rule-based software for managing, planning and delivering marketing materials in the pharmaceutical industry
High performance, high availability
Fullstack, DevOps (CI/CD)
Python, PostgreSQL, Vue.js, TypeScript, Docker, Docker Compose, Nginx
Successfully migrated old Excel-based processes into an optimized product that has been in production since 2024
Sebastián Katzer
Last position:
Smart Charging at Mercedes-Benz, MBTI
Agile software development in an interdisciplinary environment
Cross-team collaboration to achieve important milestones
Independently developing new and improving existing features
Estimation, refinement, implementation, and presentation
Finding solution ideas, analyzing problems, rolling out bug fixes
Writing automated tests, manual testing, log and error analysis
Ensuring high availability, fault tolerance, and scalability of the production environment
Rolling out releases and multi-stage infrastructure
Setting up alerts and monitoring
Pair programming, code reviews, documentation
On-call duty, 3rd level support
Event-Driven Architecture, Clean Code, Hexagonal Architecture
Microservices based on Go (Gin), Java 21 (Spring Boot 3), Python (FastAPI)
Terraform/OpenTofu, KQL, SQL, JSON, REST, Helm, ArgoCD, AzureCLI, K9s, OAuth2
Postgres, Redis, Kafka, Azure EventHub, Kubernetes, nginx, Ingress
AppInsights, LogAnalytics, OpenTelemetry, Datadog, OpenAPI 3, Swagger
Azure DataExplorer, Storage, KeyVault, Container Registry, Azure Functions,…
Junit5/Jupiter, testify, RestAssured, Docker Compose, Wiremock
IntelliJ, Scrum, Kanban, Teams, Confluence, OpsGenie, Arc42
GitHub CI/CD, GitLab CI/CD, Azure DevOps
EV charging protocols (EVSE, OCPP, V1G, V2G)
Andreas Müller
Last position:
Managing Director at ESIS-ERP GmbH
- took over as managing director
Linus Heske
Last position:
Software Developer at Check24 Vergleichsportalreise Reise Gmbh
- Designing, developing, and maintaining web portals, including creating and connecting interfaces to other systems (APIs)
- Performing error analysis and troubleshooting
- Designing and implementing data structures
- Refactoring software components to improve maintainability
- Creating user interfaces
- Web portal for monitoring error messages (PHP, MySQL, Elasticsearch, ExtJS 5.0, Symfony)
- Web portal for electric car buying advice, further development, and providing a white-label solution for a startup in the e-mobility sector (PHP, Symfony, JavaScript, Bootstrap 5)
- Providing a REST API for a healthcare app (PHP, Symfony API Platform, AWS)
- Developing middleware for data exchange between multiple applications (PHP)
Discover over 15,000 top freelancers
Statistics of experts using REST API
Aggregated from the professional profiles of matched freelancers.
Experience
19 years (Germany: 17 years)
Position duration
2.4 years (Germany: 2.9 years)
Positions per freelancer
11 (Germany: 12)
Top business areas
Information Technology, Product Development, Project Management
Top industries
Information Technology, Retail, Professional Services
Certification focus areas
Project Management, Operations, Product Development
Bachelor's degree or higher
82% (Germany: 91%)
Master's degree or higher
55% (Germany: 54%)
Certifications per freelancer
1 (Germany: 3)
Most common languages
German, English, Spanish
Speak two or more languages
93% (Germany: 96%)
Based on our profile pool as of 30 Aug 2026.
Daily rate distribution
The chart shows how the daily rates of freelancers in this technology in Leipzig are distributed, based on recent contracts on our platform. Each bar covers a rate range — its height shows how many freelancers charge within that range.
Average rates of experts in Leipzig using REST API
Rates are based on recent contracts and do not include FRATCH margin.
The average daily rate is the mean of all daily rates from recent contracts of comparable freelancers on our platform.
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 30 Aug 2026. Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.
About the technology
What it covers
REST API is the common way to expose application data and actions over HTTP. It fits web apps, mobile apps, internal services, partner integrations, and public developer portals. In practice, companies hire specialists to design endpoints that are predictable, easy to consume, and simple to maintain.
Core skills
A strong specialist works with HTTP methods, status codes, authentication, pagination, filtering, versioning, and error handling. They also write clear API documentation and keep payloads stable across releases.
- Endpoint design and resource modeling
- JSON request and response structures
- OpenAPI / Swagger documentation
- OAuth, API keys, and token-based access
- Testing, mocking, and contract checks
Typical use cases
REST APIs sit behind customer portals, SaaS products, e-commerce backends, data services, and partner integrations. They are also used to connect legacy systems with newer cloud services. In Leipzig, companies often need them for internal tools, logistics flows, media systems, and business software that must exchange data cleanly.
When to bring in help
Freelance expertise is useful when an existing API is hard to use, slow to evolve, or inconsistent across teams. It also helps when a product needs a new integration layer, migration from SOAP or older RPC-style services, or support for multiple clients at once. A good specialist can join late, review the design, and fix the parts that create friction.
Ecosystem and tooling
REST API work often goes with OpenAPI, Swagger UI, Postman, cURL, JSON Schema, and gateway or proxy tooling. Strong professionals understand how these pieces support contract-first design, testing, and release discipline. They also know how to keep documentation and implementation aligned.
What strong professionals deliver
The best experts think beyond endpoints. They reduce confusion for consumers, keep error messages useful, and make changes without breaking existing integrations. They also communicate clearly with product, backend, and frontend teams, which matters in remote work and in on-site setups in Leipzig.
Frequently asked questions
Before you brief your next project: the most common questions about REST API.
A strong REST API is used to let systems exchange data through standard HTTP calls. Companies use it for mobile apps, web front ends, partner integrations, internal services, and public data access. It works best when the resource model is clear and the responses are stable.
REST API is usually simpler to consume than SOAP because it uses standard web concepts like resources, methods, and status codes. Compared with GraphQL, it is often easier to cache, monitor, and document, but it gives clients less freedom to shape the response. The right choice depends on the product, the consumers, and the need for strict contracts.
A good REST API specialist usually knows HTTP, JSON, authentication, and API documentation. Useful nearby skills include OpenAPI, testing tools like Postman, contract validation, and basic security work around tokens and access control. Experience with backend systems and integration patterns is also valuable.
A REST API project needs someone who can make consistent design choices and explain them clearly. Simple additions may need only focused support, while larger platform work benefits from deeper experience with versioning, error handling, and backward compatibility. If many teams depend on the API, quality matters more than speed alone.
Most REST API work can be done remotely because the main deliverables are designs, documentation, reviews, and implementation changes. On-site time in Leipzig can help when teams need fast workshops, interface alignment, or support for systems that already live with local stakeholders. Many projects use a mix of both.
A strong RESTful API specialist leaves clear endpoints, predictable errors, and documentation that matches the implementation. Look for clean resource naming, good use of status codes, secure access handling, and careful versioning. Good work is easy for other experts to consume and hard to break.
A REST API freelancer should ask who will consume the API, which authentication method is required, and how changes will be released. It also helps to know whether the work starts from scratch, extends an existing service, or replaces an older interface. Clear answers avoid rework later.
Yes, many search for REST when they mean REST API or RESTful API. That usually reflects how the topic is used in daily work, especially in older documentation and team discussions. A good specialist should recognize all three terms and know when each one is being used.
The average hourly rate of freelancers in Leipzig, Germany who have used REST API in their recent projects is 91 €, which corresponds to a daily rate of about 725 € based on an 8-hour working day.
Of the freelancers in Leipzig, Germany who have used REST API in their recent projects, 82% hold at least a Bachelor's degree and 55% hold at least a Master's degree.
On average, freelancers in Leipzig, Germany who have used REST API in their recent projects have 19 years of professional experience, with a single engagement typically lasting around 2.4 years.
The most common languages among freelancers in Leipzig, Germany who have used REST API in their recent projects are German (93%), English (93%), and Spanish (14%).
The most common industries among freelancers in Leipzig, Germany who have used REST API in their recent projects are Information Technology (93%), Retail (50%), and Professional Services (43%).
The most common business areas among freelancers in Leipzig, Germany who have used REST API in their recent projects are Information Technology (100%), Product Development (100%), and Project Management (50%).
Main locations of FRATCH Experts, who have recently used REST API
Our freelancers and interim experts are at home across the DACH region — available on-site in the major business hubs or fully remote. Choose a location to discover matched specialists, local market insights and up-to-date availability.
Berlin 
Hamburg 
Munich 
Cologne 
Frankfurt 
Stuttgart 
Dusseldorf 
Dortmund 
Essen 
Bremen 
Dresden 
Hanover 
Nuremberg Request a free demo
Get in touch with the FRATCH team and we will get back to you within 4 hours.
Would you rather directly get in touch?
We always have the time for a call or email!
Philipp Thomaschewski
FRATCH CEO
