REST API Experts in Hamburg
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Meet FRATCH Experts in Hamburg, who have recently used REST API
Yashar Sadeghi
Last position:
Managing Director/Consultant at Efficient Consulting
- Led strategic IT and process consulting projects, streamlined business processes, and aligned IT systems with business goals, resulting in a 20% improvement in organizational efficiency.
- Led international transformation projects using agile and traditional methods, managing a cross-functional team of more than 15 professionals and delivering solutions on time and within budget.
- Developed cloud-based ERP/CRM systems (Salesforce, Infor, Microsoft) for clients, ensuring seamless integration and reducing system downtime by 30%.
- Led large-scale change management initiatives, actively involving stakeholders at all levels and driving the successful rollout of innovative systems in global organizations.
- Led requirements analysis and the tender process for clients, identified cost-saving opportunities, and improved operational workflows.
Guido Bäcker
Last position:
Independent Management Consultant and Interim Manager at BCTC Unternehmensberatung Guido Bäcker
Consulting, training, and coaching in the financial sector on strategy, organization, and IT topics
MorgenFund: Advising the operator of a fund platform on software selection for a sub-ledger "Cash Accounts" based on Virtual IBANs (VIBAN)
Structuring requirements, market screening, creating RfIs, communicating with vendors, and conducting the selection process
UniCredit/HypoVereinsbank: Workstream lead "Booking and Customer Reporting" in the payment transformation project "PULS"
Business analysis, creating business requirements and aligning solution items as part of the functional specification with the bank's IT service providers
Business analysis of SEPA CT and SWIFT MX (.camt, .pain, and .pacs formats), change management, team lead for a virtual team of fifteen line experts, and stakeholder management
equensWorldline Germany: Program management for three projects of the SWIFT service bureau (CBPR+, ESMIG, and Euro1Step1 migration) as part of the SWIFT MX migration
Managing individual project managers regarding overarching goals and requirements; reporting to internal and external committees and stakeholders; coordinating with dependent projects and programs
Project management/PMO: interim project management, stand-in for project managers, resource planning, budget and cost management, general PMO tasks
Daniel Sedlack
Last position:
Senior Software Engineer at energielenker solutions GmbH
- Designed and implemented a Python-based ETL pipeline with the Dagster framework to transform raw energy data from heterogeneous sources using InfluxDB and visualizations in Grafana
- Defined time-based and dependency-based jobs
- Deployed to managed Kubernetes clusters using Helm
- Integrated InfluxDB Cloud
- Prepared data for use in Grafana, including cleaning, normalization, and time-based resampling in Python
- Developed dashboards and visualizations in Grafana
- Developed unit tests with mocking using pytest
- Set up a CI/CD pipeline in GitLab
Technologies: Python, Dagster, InfluxDB, Grafana, pandas, pytest, REST, CI/CD, GitLab, Container, Kubernetes, Helm, Docker, Cloud
Anastasiia Komarenko
Last position:
Senior Test Automation Engineer at E.ON
- Reviewing functional and technical requirements from a testing perspective
- Creating test cases and automated tests to validate requirements
- Performing manual and automated functional, end-to-end, and regression tests
- Documenting test results and tracking defects
- Using models like GPT-4, BERT, and Hugging Face Transformers for automated test case generation, analysis of test results, and improving test coverage, including bias checks and security reviews
- Techs: MS Office, Jira, Zephyr, Confluence, Tosca, stakeholder communication, Agile, Kanban, Scrum, OpenAI API, Hugging Face, PyTorch, LangChain.
Cornelius Höfig
Last position:
Solution Architect at STIHL
- Remodeling of the system architecture for an Azure-based platform aimed at rapid development of new functionalities
- Modeling of a staging concept for the fulfillment of diverse customer and QA needs
- Creation of requirements for, and oversight of, a proof-of-concept supplier project for a Flutter app with highly advanced BLE functionalities
- Comparison of multiple observability platforms for feasibility and requirements fit within the project environment
- Creation of a mobile app architecture based on domain-driven architecture
- Position of technical advisor and accountable solution architect for two development teams
- Execution of architecture reviews and alignment of changes with architectural expectations
- Skills & Technologies: Microsoft Azure , App Services, NodeJS Mono-repository, microservice architecture, domain driven design, self contained systems, requirements engineering, CI/CD, DevOps, API design, solution architecture
Heena Patel
Last position:
Retirement Spend & Tax Optimizer Agentic AI App (Vibe Coding) at Personal Project
Self-directed exploration of agentic AI development methods, taken from idea to a working, publicly usable application
- Built an interactive planning tool for modelling retirement withdrawals and tax strategy using an agentic AI (vibe coding) development approach – demonstrating self-directed investigation of new AI-assisted development methods
- Delivered live, tax-aware spending projections and adjustable user inputs; shipped as a free, install-free browser application built in Python, with attention to usability for non-technical users
Jenny Lam
Last position:
Product Manager – Data & Sustainability at shipzero GmbH
Designed and implemented an initial product management framework
Created a process for prioritizing the product roadmap with internal stakeholders, considering business impact, resources, and technical feasibility
Led the migration to a product discovery tool to improve transparency and cross-team collaboration
Served as a liaison between tech and business teams
Managed data-driven sustainability projects for the largest key account, including implementing regulatory reporting (ISO 14083) on greenhouse gas emissions
Delivered complete data integration across 20+ source systems, coordinating onboarding and translating business requirements into technical specs for the development team
Enhanced the client's emission tracking and reporting accuracy through data quality analyses and identifying optimization opportunities
Rizwan Bashir
Last position:
Software Developer/Database/DevOps at Sutor Bank
- Migration and maintenance of a legacy system to the latest version of .NET for the asset management system
- Design and implementation of tests
- Creation of deployment pipelines and documentation
- Further development and implementation of change requests
- Technologies: C#, ASP.NET, Unit of Work, IOC, Three tier architecture, Entity Framework Core, DB First, Web API, Swagger, Open API, Monolith, Python, Oracle, Azure DevOps, GIT, xUnit, NSubstitute
- Methods: Agile development using Scrum
Florian Wede
Last position:
Software Engineer at micimo GmbH
- Developing a professional scheduler for organizations with specific detailed requirements
- Evaluating different existing software solutions
- Creating a list of technical requirements
- Implementing these requirements
- Selected technologies: WebDAV, CalDAV, Rust, Baikal, OAuth, Keycloak
Rainer Diekmann
Last position:
Enterprise Architecture Management / Backend Software Developer at Polizei Hamburg
- Several projects in a police context
- Model and document police procedures/projects with Archimate (as-is/to-be) in the context of P20 (BKA)
- Create software architectures with microservices
- POC development with Springboot/Docker/Kubernetes
- Project size: 10 people
- Enterprise architecture management with Togaf and Archimate
- Backend software development Springboot
- DevOps with Kubernetes
- Implemented using: Java 17/21, Springboot 3, P20 architecture, Togaf, Archimate
Marian Gaebler
Last position:
Senior Software Engineer at B&P Bergmannpartners
- Full-stack development of a customizable SaaS platform for the real estate industry
- Running domain discovery processes to gather business requirements and derive technical specifications
- Designing and implementing core features based on a Remix MVC architecture with TypeScript, Node.js, and PostgreSQL
- Focus on usability, extensibility, and high scalability of the platform
Torsten Lüders
Last position:
Technical design and development of frontend and backend for e-waste-race.de / textil-race.de at Das macht Schule gemeinnützige GmbH
- Creation of a platform where schools can run competitions to collect e-waste or old textiles
- Development of a shared PHP backend for administration by the client
- Connection of two separate WordPress sites via REST API
- Development of a custom WordPress theme with an extensive login area for students
- Setup of normally editable content pages using Elementor
Holger Guschigk
Last position:
Test Automation Engineer, Quality Assurance Consultant at T-Systems
- Poliks – State Police System for information, communication, and case management and other state variants (ViVa, Bravo, customs)
- Developed a test framework for test automation to replace an existing proprietary test client for new developments, focusing on easy maintenance and simple extensibility for new technologies
- Designed the architecture
- Implemented the architecture
- Created a proof of concept by migrating existing test cases into the new test framework
- Platform: C#, .NET, Jira, XRay, Confluence, Playwright, Selenium, UI Automation, Appium, HTML, Git, VMWare, Windows 11, Linux
Patrick Von Der Gönna
Last position:
Senior Director, Retail Media at EUROBAUSTOFF Handelsgesellschaft mbH & Co. KG
- Strategic consulting on marketing funds (WKZ) and retail media, focusing on monetization opportunities and data-driven business models
- Conducting a portfolio analysis of existing WKZ measures to assess the revenue and ROI impact of WKZ investments on supplier performance
- Potential analysis of digital WKZ products and initiatives to identify growth and efficiency levers
- Preparing and presenting the results to management and deriving a strategic move-forward plan
- Designing and facilitating several executive workshops to develop a holistic retail media vision and transformation roadmap
- Defining and prioritizing retail media business cases for data-driven evaluation of investment options
- Developing a technical target architecture considering heterogeneous ERP infrastructures and designing an integrated loyalty program
- Designing change management, including impact analysis on organizational structures and processes
- Creating and presenting C-level decision templates
- Establishing a clear retail media governance structure and technical foundation for data-driven marketing
- Developing a roadmap for implementation in 2026
Mohammad Mirmohammadi
Last position:
Senior Frontend Developer / IT Consultant at Freelance
Development of modern web applications focusing on React and Next.js
Implementation of e-commerce and business platforms for SMEs
Analysis and optimization of software and data structures
Design and development of custom IT solutions
Structuring of data flows and system architectures
Ongoing project work in web development and platform solutions
Tax Advisor Platform with Client Portal and Admin System:
Development of a web-based platform with an integrated client portal
Implementation of a system solution including a website, admin panel, and client application
Development of a role-based access system (admin / client)
Implementation of document and invoice management
Digitization of business processes
Building high-performance frontend structures
Integration of APIs and backend logic
Coffee Business Platform with Admin System:
Development of a web application for a café with administrative functions
Implementation of internal workflows and user management
Structuring of digital business processes
Development of modern UI components with a focus on performance
Shared Account Platform (Admin & Client Applications):
Development of a scalable platform with separate applications for admins and users
Implementation of a role-based access system
Development of a modular frontend architecture with React and TypeScript
Integration of API structures and data management
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
2 years (Germany: 2.9 years)
Positions per freelancer
13 (Germany: 12)
Top business areas
Information Technology, Product Development, Project Management
Top industries
Information Technology, Retail, Professional Services
Certification focus areas
Information Technology, Product Development, Project Management
Bachelor's degree or higher
84% (Germany: 91%)
Master's degree or higher
46% (Germany: 54%)
Doctorate
14% (Germany: 7%)
Certifications per freelancer
2 (Germany: 3)
Most common languages
German, English, French
Speak two or more languages
98% (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 Hamburg 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 Hamburg 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 REST API covers
A REST API lets systems exchange data through clear HTTP endpoints. It is used for web apps, mobile apps, partner integrations, and internal services that need stable, predictable access to business data. Strong experts keep the interface simple, consistent, and easy to consume.
Common work
- Design resource paths, methods, and request or response formats
- Connect backend services, databases, and third-party systems
- Define authentication, error handling, and versioning rules
- Write API documentation that other specialists can follow
Tooling around it
REST API work often sits next to OpenAPI, Swagger, JSON, HTTP, OAuth 2.0, and API gateways. Skilled professionals know how to test endpoints, review payloads, and keep contracts clear across teams. They also understand when a service should stay RESTful and when a different interface fits better.
When companies bring in freelancers
Companies bring in freelance REST API experts when a new product needs a clean interface, when old endpoints need refactoring, or when external partners must integrate quickly. In Hamburg, this often matters for logistics, trade, media, and commerce teams that run mixed local and remote collaboration. Clear written communication helps when product, backend, and frontend specialists work together.
What strong experts do well
Strong specialists think in resources, not just routes. They protect backward compatibility, keep responses predictable, and avoid unnecessary complexity. They also spot missing validation, weak auth, and documentation gaps before those issues reach production.
Signs you need help
- Your endpoints are hard to use or inconsistent
- Integrations keep breaking after small changes
- Teams disagree on request, response, or versioning rules
- Documentation does not match the current implementation
A good freelancer can review the existing API, clean up the design, and help your team ship a more reliable service layer.
Frequently asked questions
Curious about REST API? Here are the answers that come up again and again.
A REST API is used to let applications exchange data through standard HTTP methods and resource-based endpoints. Companies use it to power web products, mobile apps, partner integrations, reporting tools, and internal services. The goal is a simple interface that other specialists can use without deep knowledge of the underlying system.
A REST API is usually easier to expose and consume because it relies on familiar HTTP patterns and fixed resources. GraphQL is better when clients need flexible queries, while SOAP is more rigid and often tied to older enterprise systems. The right choice depends on the shape of the data, governance needs, and how many consumers will use the interface.
A strong REST API specialist usually works comfortably with HTTP, JSON, OpenAPI, authentication, and testing tools. They should also understand how frontend, backend, and integration teams depend on the contract. Good communication matters because clear documentation and versioning are part of the work.
A REST API project goes smoother when you already know the main resources, user flows, authentication model, and systems that must connect. If the scope is still open, a specialist can help shape the interface before coding starts. That is often better than fixing a rushed design later.
Yes, REST API work is often well suited to remote collaboration because much of the effort is design, review, and testing. For Hamburg-based teams, on-site time can still help during early workshops or when several groups need to align on contracts. Many projects work best with a mix of both.
Look for a REST API specialist who can explain resource naming, status codes, error formats, and versioning without hand-waving. They should show examples of well-structured endpoints and describe trade-offs clearly. Strong candidates also think about how the interface will age, not just how it works today.
A REST API project often sits alongside OpenAPI, Swagger, JSON, OAuth 2.0, API gateways, and test tooling. Depending on the stack, you may also need database knowledge, backend frameworks, and deployment basics. The best experts understand enough of the full chain to keep the interface reliable end to end.
Bring in a REST API freelancer when your team needs speed, a second opinion on design, or experience with complex integrations. Outside help is also useful when an existing API has grown messy and needs a careful cleanup. That is especially common when multiple teams depend on the same service contract.
The average hourly rate of freelancers in Hamburg, Germany who have used REST API in their recent projects is 96 €, which corresponds to a daily rate of about 768 € based on an 8-hour working day.
Of the freelancers in Hamburg, Germany who have used REST API in their recent projects, 84% hold at least a Bachelor's degree, 46% hold at least a Master's degree, and 14% hold a doctorate.
On average, freelancers in Hamburg, Germany who have used REST API in their recent projects have 18 years of professional experience, with a single engagement typically lasting around 2 years.
The most common languages among freelancers in Hamburg, Germany who have used REST API in their recent projects are German (100%), English (96%), and French (19%).
The most common industries among freelancers in Hamburg, Germany who have used REST API in their recent projects are Information Technology (92%), Retail (54%), and Professional Services (50%).
The most common business areas among freelancers in Hamburg, Germany who have used REST API in their recent projects are Information Technology (96%), Product Development (92%), and Project Management (56%).
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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Essen 
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Nuremberg Request a free demo
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