REST API Experts in Hanover
for reliable integrations, matched in minutes with vetted and available freelancersHire experts who design resource-oriented interfaces, secure JSON services and connect web, mobile, and business systems through REST API architectures. FRATCH finds a precise match quickly from vetted, available freelance professionals.
Meet FRATCH Experts in Hanover, who have recently used REST API
Priyanka S.
Last position:
Business Consultant (Software Engineering) at Boehringer Ingelheim
- Developed cloud-native enterprise applications on SAP Business Technology Platform using Node.js, SAP UI5, and RESTful APIs, delivering solutions across training management, procurement, employee information, and logistics domains
- Served as the primary developer for the maintenance, enhancement, and production support of three enterprise applications, delivering new features, resolving production issues, and coordinating releases with business stakeholders
- Experienced in leveraging AI-assisted development tools such as Microsoft Copilot to accelerate feature development, generate code, prototype solutions, and support application migration and modernization
- Designed backend services, domain models, and SAP Fiori/UI5 interfaces, implementing business workflows, role-based access control, validations, scheduling, reporting, and data import/export capabilities
- Designed and integrated enterprise services with SAP SuccessFactors, SailPoint, ERP systems, and external Learning Management APIs, including automated synchronization for 11,000+ user data
- Designed and implemented AMQP-based event-driven services processing up to 500 RFID parcel scan events per day for a logistics application
- Managed deployments and application operations using CI/CD pipelines, SAP Solution Manager, SAP BTP Cockpit, Kibana, and cloud monitoring tools, performing root-cause analysis and resolving production incidents
- Managed application dependencies by resolving npm package version conflicts and remediating critical and high-severity security vulnerabilities, ensuring production compliance and application stability
- Collaborated with architects, business users, SAP governance teams, and distributed Agile teams throughout technical design, code reviews, sprint planning, documentation, and software delivery
Jens O.
Last position:
Frontend Developer at Volkswagen Financial Services AG
Cross-brand design system
Focus: Analysis of the causes of recurring layout deviations in design system components. The cause was the integration of visual regression tests (BackstopJS) into the build and approval process: deviations were not blocked, and reference images were replaced without approval.
Recommendations for a controlled workflow with mandatory approval and test results as a prerequisite for merging. Contributed to the successor system based on Lit/Web Components.
Technologies: Lit, Web Components, SCSS, Gulp, BackstopJS, GitHub Enterprise, JFrog Artifactory
Shweta S.
Last position:
Java Developer (Working Student to Intern) at Nord LB
- Took ownership of the full development lifecycle for various features, from design through coding, debugging, and production deployment, ensuring compliance with banking-grade reliability standards.
- Optimized SQL queries, reducing data-processing time by up to 50%, especially for large datasets handled.
- Developed and maintained automated tests using JUnit and Mockito.
- Utilized GitHub Copilot as an AI-assisted development tool to accelerate code generation, improve code quality, and increase development efficiency within the team.
- Resolved 90% of assigned production issues independently, often under tight deadlines, contributing to uninterrupted system availability.
Martin S.
Last position:
MS Fabric Certification
MS Fabric certification with creation of pipelines and notebooks in Fabric using data from Azure, Azure Repos, Azure Boards, and GitHub. Data ingestion via OneLake Explorer, direct IP connection, and API (REST) are the main topics
Bastian B.
Last position:
Backend Developer at SupplyOn AG
In this project, I support the software development of various modules of the supply chain management solution. My responsibilities include the technical implementation and optimization of collaborative SCM processes that help companies make their supply chains more efficient, transparent, and resilient. This modular software platform facilitates communication and Collaboration with suppliers is standardized and digitized, enabling seamless traceability of quality data and supplier evaluations. Technically, I focus on development with Go/Golang for scalable backend services and on the use of Kafka for real-time messaging and event processing. I design and extend GraphQL interfaces for efficient data communication between microservices and support automated build and deployment management using Docker and Gitlab CI/CD pipelines. Data is stored in the modules I work on using a PostgreSQL database.
Technical focus: Go/Golang, Kafka, GraphQL, Docker, Gitlab, CI/CD, DevOps, PostgreSQL, JIRA, Miro
Martin Z.
Last position:
Consulting, Design and Development at ivv GmbH
- Design, development and maintenance of a web application as a policy management system based on a JEE backend and a Vaadin-based UI
- Design and development of interfaces
- Integration of databases
- Design and development of unit and integration tests
- Conceptual coordination with the client
- Technologies and methods: JEE, Vaadin, EJB, Innovator, Hibernate, REST, JMS, SQL, MQ, Maven, Selenium, Arquillian, Mockito, JUnit, Log4j, OOA, OOD, Scrum, Kanban, JavaScript, HTML, CSS, Jenkins, Jenkins Pipelines, Git, GitLab, Subversion, Jira, Confluence, DB2, WebLogic
Marwan B.
Last position:
Full-Stack Developer, Business Analyst at HDI Deutschland AG
- Backend development with Spring Boot (Java) for health and VH
- Frontend development with Angular (TypeScript) for health and VH
- Implementation of REST services incl. business logic in the backend, development of frontend components
- Building build and deployment pipelines (GitLab CI/CD)
- Business and technical requirements analysis, maintenance of user stories, stakeholder management
- Coordination with IT architecture, UX design (mockups with Balsamiq)
- Creating interface definitions (OpenAPI), Camunda process modeling (BPMN)
- 8 years of consulting for insurance companies: property & liability (private, corporate)
Timo G.
Last position:
S/4HANA Project Management, Board and Strategy Consulting at Services
- S/4HANA project management: book project with an online hub to derive an agile project management methodology (Scrum) based on SAP Activate, Solution Manager Focused Build, SAP Enable Now, many SAP project accelerators, community solutions and custom developments.
- Strategy consulting: overview of service providers and product vendors as well as demos and videos to present best practice processes, cloud solutions and SAP community products.
- Sales structure development: scaling the network organization via partnerships, public relations (PR), marketing, digital events etc.
- Contract terms & general terms and conditions: manufacturing and service contracts, personnel placement contracts, copyrights etc.
Marvin W.
Last position:
PACS Senior IT Project Manager at Fraport / ID Engineering
- Took a leading role integrating NECT Ident and NECT Sign (AI-based solutions for identity verification and electronic signature) into ID Engineering's PostgreSQL PACS (Physical Access Control System) used at Fraport.
- Analyzed system architecture and interfaces, and implemented Microsoft Azure REST API integrations for legally compliant identity verification and signature.
- Developed and implemented security-critical workflows in Visual Studio Code to seamlessly embed NECT processes into existing PACS Mulesoft Anypoint Platform™ structures.
- Contributed to the evolution of the airport security architecture by linking identity verification, ID management, and physical access control with Microsoft Power BI.
- Collaborated closely with NECT and internal IT teams on API configuration, testing, and production rollout.
Frank N.
Last position:
Developer at In-house development of the HAPPYLIST web application
- Fully developed a CRM system for contact management in network marketing
- Enabled configuration of tags, custom reminders, birthday reminders and more
- Application is productive
- Technologies and methods: Trello, Python, Django, Rest-Framework, Bootstrap, PostgreSQL
Discover over 15,000 top freelancers
Statistics of experts using REST API
Aggregated from the professional profiles of matched freelancers.
Experience
20 years (Germany: 17 years)
Position duration
1.8 years (Germany: 2.9 years)
Positions per freelancer
13 (Germany: 12)
Top business areas
Information Technology, Product Development, Quality Assurance
Top industries
Information Technology, Banking and Finance, Insurance
Certification focus areas
Information Technology, Project Management, Product Development
Bachelor's degree or higher
88% (Germany: 92%)
Master's degree or higher
38% (Germany: 55%)
Doctorate
13% (Germany: 7%)
Certifications per freelancer
2 (Germany: 3)
Most common languages
German, English, Spanish
Speak two or more languages
90% (Germany: 97%)
Based on our profile pool as of 29 Oct 2026.
Daily rate distribution
The chart shows how the daily rates of experts in this technology in Hanover are distributed, based on recent contracts on our platform. Each bar covers a rate range — its height shows the share of experts charging within that range.
Average rates of experts in Hanover 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 29 Oct 2026. Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.
REST API experts industry focus
See which industries our matched freelancers work in most often — every figure is calculated live from the freelancers on FRATCH.
- Information Technology (100%)
- Banking and Finance (70%)
- Insurance (50%)
- Manufacturing (50%)
- Automotive (40%)
- Healthcare (40%)
- Professional Services (40%)
- Transportation (30%)
Please note that freelancers can work across multiple industries, so percentages overlap.
About the technology
What REST API means
A REST API is a web interface that lets software exchange resources through standard HTTP methods such as GET, POST, PUT, and DELETE. Responses commonly use JSON, while clear URLs, status codes, and stateless requests make services easier to consume. Companies use REST APIs to connect applications without tightly coupling their internal systems.
What it helps build
REST APIs support customer portals, mobile back ends, partner integrations, headless commerce, and internal business services. They expose controlled capabilities to browsers, apps, data pipelines, and other systems.
- Connect web and mobile applications to core services
- Expose product, order, account, and content data
- Integrate payment, logistics, identity, and CRM systems
- Provide partner-facing interfaces with documented contracts
Ecosystem and tooling
Strong REST API work spans HTTP, JSON, authentication, databases, and application frameworks. Specialists may work with OpenAPI, Swagger UI, Postman, OAuth 2.0, JWT, GraphQL comparisons, Docker, and cloud gateways. Testing includes unit, integration, contract, and load checks.
When companies need specialists
Freelance expertise is useful when a team must modernize an older service, release a public interface, or connect systems across departments. It also helps when inconsistent endpoints, weak authentication, unclear documentation, or recurring integration failures slow delivery.
- Define resources, endpoint behavior, and versioning rules
- Secure access with suitable authentication and authorization
- Improve validation, error handling, observability, and performance
- Document interfaces so other teams can use them safely
What strong professionals deliver
A capable professional starts with consumers, business rules, and data ownership rather than only routes and controllers. They establish consistent naming, predictable status codes, pagination, filtering, idempotency, and backwards-compatible change. They also connect interface decisions to monitoring, deployment, and operational support.
Working with a freelancer
REST API projects can be handled remotely when requirements, access, and review processes are clear. In Hanover, on-site collaboration may help when the work involves local teams, regulated environments, or complex system dependencies, while remote specialists can still contribute effectively across Germany. Agree on API ownership, environments, security reviews, documentation, and handover before implementation begins.
Frequently asked questions
What clients ask us most about REST API — answered in short.
A REST API lets applications exchange resources over HTTP. Companies use it to connect websites, mobile apps, partner systems, payment services, and internal business software through defined endpoints.
A REST API uses resource-oriented endpoints and standard HTTP behavior, which makes it familiar and widely supported. GraphQL can give clients more control over returned data, while SOAP offers stricter contracts and established enterprise features; the right choice depends on consumers, governance, and integration needs.
A strong REST API specialist should understand HTTP, JSON, databases, authentication, authorization, and automated testing. Experience with OpenAPI, OAuth 2.0, cloud gateways, observability, CI/CD, and the application framework behind the service is also valuable.
The scope of the REST API matters more than a fixed experience label. A small internal integration may need focused interface and testing skills, while a public service with sensitive data, many consumers, or strict availability needs a professional who has handled security, versioning, monitoring, and backward compatibility.
Yes, REST API work is often suitable for remote collaboration because specifications, repositories, test environments, and reviews can be shared online. Hanover-based teams should clarify access, communication, data handling, and meeting language early when working with a remote professional.
Bring in a REST API freelancer when integrations are blocking delivery, an interface needs to be designed for external consumers, or an existing service has reliability and documentation problems. A specialist can assess the current contract, reduce coupling, and create a practical delivery plan.
Review whether the REST API has consistent resource names, correct status codes, clear validation, secure access, useful errors, and stable versioning. Ask to see documentation, automated tests, monitoring plans, and examples of how the professional handled breaking changes.
A complete REST API delivery should include an agreed contract, authentication rules, error behavior, documentation, tests, deployment configuration, and operational monitoring. It should also explain ownership of data, compatibility expectations, and how future consumers can adopt new versions safely.
The average hourly rate of freelancers in Hanover, Germany who have used REST API in their recent projects is 89 €, which corresponds to a daily rate of about 712 € based on an 8-hour working day.
Of the freelancers in Hanover, Germany who have used REST API in their recent projects, 88% hold at least a Bachelor's degree, 38% hold at least a Master's degree, and 13% hold a doctorate.
On average, freelancers in Hanover, Germany who have used REST API in their recent projects have 20 years of professional experience, with a single engagement typically lasting around 1.8 years.
The most common languages among freelancers in Hanover, Germany who have used REST API in their recent projects are German (100%), English (80%), and Spanish (10%).
The most common industries among freelancers in Hanover, Germany who have used REST API in their recent projects are Information Technology (100%), Banking and Finance (70%), and Insurance (50%).
The most common business areas among freelancers in Hanover, Germany who have used REST API in their recent projects are Information Technology (100%), Product Development (80%), and Quality Assurance (70%).
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.
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Dusseldorf 
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Dresden 
Nuremberg Request a free demo
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