REST API Experts in Hanover
matched in minutes from over 15,000 CVs with the power of AIHire experts who design reliable web services, connect systems through JSON and HTTP, and secure integrations with OAuth or OpenAPI. FRATCH matches you quickly and precisely with vetted, available freelancers who fit your REST API project.
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
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 Platformâ„¢ 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
18 years (Germany: 17 years)
Position duration
1.8 years (Germany: 2.9 years)
Positions per freelancer
12
Top business areas
Information Technology, Product Development, Quality Assurance
Top industries
Information Technology, Banking and Finance, Automotive
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
89% (Germany: 97%)
Based on our profile pool as of 19 Sep 2026.
Daily rate distribution
The chart shows how the daily rates of freelancers in this technology in Hanover 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 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 19 Sep 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 (67%)
- Automotive (44%)
- Healthcare (44%)
- Insurance (44%)
- Manufacturing (44%)
- Professional Services (44%)
- Aerospace and Defense (22%)
Please note that freelancers can work across multiple industries, so percentages overlap.
About the technology
APIs for connected systems
A REST API exposes resources and actions through standard HTTP methods such as GET, POST, PUT and DELETE. It usually returns JSON, making it a practical boundary between web frontends, mobile apps, internal services and external partners. A RESTful API can support both new products and careful modernization of older systems.
Core design work
Strong REST API specialists define clear resource models, URL structures, status codes and error responses. They also handle pagination, filtering, versioning, idempotency and validation so that integrations remain predictable as requirements change. OpenAPI descriptions help teams document and test the contract.
Ecosystem and security
REST API work connects closely with backend frameworks, databases, gateways and cloud services. Professionals may use tools such as Postman, Swagger UI, OpenAPI, Docker and automated test suites. Security often includes OAuth 2.0, JWT, API keys, rate limiting, input validation and audit logging.
Typical project needs
- Create APIs for web, mobile or partner applications
- Connect CRM, ERP, payment and logistics systems
- Replace fragile point-to-point integrations
- Add authentication, monitoring and usage controls
- Document and test an existing HTTP API
When to bring in specialists
Companies often seek freelance REST API expertise when an integration is blocking a release, several systems need one reliable interface, or an existing service has become difficult to maintain. In Hanover, specialists may support local product teams and industrial businesses on-site, remotely or in a blended setup. Clear English is common; German can help when work involves local stakeholders.
What quality looks like
A capable professional balances clean resource design with real operational concerns. They ask how clients will consume the service, define backward-compatible contracts and test failure paths rather than only successful requests. Look for evidence of documented APIs, secure authentication, observability, performance testing and clear collaboration with frontend, data and infrastructure teams.
Frequently asked questions
What clients ask us most about REST API — answered in short.
A REST API lets software exchange data and actions over HTTP using identifiable resources and standard request methods. Companies use RESTful APIs to connect browser applications, mobile products, business systems, payment providers and partner services.
A REST API uses resource-oriented HTTP endpoints and is often straightforward to cache, document and operate. GraphQL gives clients more control over requested data, while SOAP uses stricter message contracts and is still relevant in some enterprise environments. The right choice depends on integration needs, governance and existing systems.
A strong RESTful API specialist usually understands backend development, data modeling, SQL or NoSQL databases and automated testing. Useful adjacent skills include OpenAPI, OAuth 2.0, Docker, cloud deployment, API gateways, logging and monitoring.
The right REST API experience depends on the scope, risk and number of connected systems rather than on a fixed project duration. A simple internal service may need focused implementation, while public or regulated integrations require careful versioning, security, resilience and operational support.
Yes, REST API work is well suited to remote collaboration because contracts, code, tests and API documentation can be reviewed online. Teams in Hanover should agree on communication routines, access rules, delivery milestones and whether occasional on-site workshops are useful.
Review whether the REST API has consistent naming, useful documentation, precise error handling and tests for authentication, validation and failure cases. Also check how it handles monitoring, backward compatibility, rate limits and sensitive data instead of judging quality from endpoint count alone.
An HTTP API may use HTTP but still behave like a collection of remote commands, with inconsistent URLs, methods or response codes. A more RESTful design treats resources consistently and uses HTTP semantics clearly, although many practical APIs follow REST principles without implementing every formal constraint.
Before starting, a REST API professional should clarify consumers, resource ownership, data formats, authentication, expected traffic, compatibility rules and deployment constraints. They should also confirm who maintains the API contract and how changes, incidents and access to test environments will be handled.
The average hourly rate of freelancers in Hanover, Germany who have used REST API in their recent projects is 93 €, which corresponds to a daily rate of about 745 € 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 18 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 (78%), and Spanish (11%).
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 (67%), and Automotive (44%).
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 (78%), and Quality Assurance (67%).
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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