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I am ready to publish a new integration on the OrbisAPI marketplace and need a production-ready RESTful API built from scratch. The service will act as a bridge between OrbisAPI and a small set of third-party APIs that I will specify once the project starts. No local database or file system storage is required—every request will simply fetch, transform, and return data coming from those external providers. Core scope • Design clean, versioned REST endpoints that follow standard HTTP semantics (GET, POST, PUT/PATCH, DELETE). • Handle authentication to the external providers using their preferred schemes (mostly Bearer tokens and OAuth2). • Normalise the responses so OrbisAPI users receive a consistent JSON structure regardless of which upstream service is queried. • Write concise OpenAPI / Swagger documentation and an onboarding guide that meets the formatting rules in the OrbisAPI marketplace publisher docs. • Package the code so it can be containerised easily; I am comfortable deploying Docker images, so a Dockerfile and short README are expected. • Include unit tests that cover the primary success paths and common error states; feel free to use Jest, Mocha, PyTest, or another lightweight framework that suits the language you choose. Acceptance criteria The API is considered complete when: 1. All listed endpoints return the expected shape and status codes, verified by automated tests. 2. The OpenAPI spec passes OrbisAPI’s validator with no warnings. 3. A sample consumer script demonstrates end-to-end calls against at least two of the target third-party APIs. I am language-agnostic—Node.js (Express/Fastify), Python (FastAPI/Flask), or Go are fine as long as the final artefacts meet the above criteria. Once delivered, I will take care of hosting, so please keep any environment variables or secrets configurable via .env files only. If you have published integrations on marketplaces before—or simply love crafting lean, well-documented REST services—let’s talk.
Project ID: 40418874
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Active 8 days ago
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206 freelancers are bidding on average $20 USD/hour for this job

Hello, I will build a production-ready RESTful API bridge for OrbisAPI Marketplace with clean, versioned endpoints and consistent JSON structures across upstream providers. The service will fetch data from the chosen third-party APIs on demand, authenticate per provider’s Bearer/OAuth2 schemes, and normalize responses into a single, predictable shape. I will provide a concise OpenAPI spec and an onboarding guide that matches OrbisAPI marketplace standards, plus a Docker-ready package (Dockerfile, README) and lightweight tests to cover common success and error paths. The solution will be language-agnostic in practice, with a strong preference for Node.js (Fastify/Express) or Python (FastAPI/Flask) to deliver small, dependency-light artifacts. I will implement environment-based configuration via .env, ensuring secrets stay out of code and are injected at runtime. The code will be modular, making it easy to add more upstream providers later while preserving a stable consumer interface. What are the two primary third-party APIs you want integrated first, and what is the exact shape you expect for the normalized response for each endpoint? If you have preferred upstream providers or specific response fields you want normalized first, I can tailor the initial endpoints and data mapping accordingly. Best regards,
$25 USD in 33 days
8.5
8.5

I am a seasoned API developer with extensive experience in designing and implementing RESTful APIs for various marketplaces. My proficiency in Node.js, Python, and Go enables me to adapt flexibly to your project needs, ensuring that the desired final artifacts align with your requirements. I have a solid background in integrating multiple third-party APIs while maintaining authentication protocols like Bearer tokens and OAuth2. I am skilled in crafting clean, versioned REST endpoints and can normalize responses for consistent JSON structures across different services. I am also familiar with producing comprehensive OpenAPI/Swagger documentation, essential for OrbisAPI marketplace compliance. I am well-versed in containerization using Docker and will provide a clear README alongside the Dockerfile. Additionally, I employ robust testing frameworks such as Jest and PyTest to ensure all endpoints meet expected outcomes. I'm eager to discuss your project further and clarify any specific demands or questions you may have.
$20 USD in 40 days
8.4
8.4

Hi, This is Elias from Miami. I have gone through your project description and understand you’re looking to develop a production-ready RESTful API for the OrbisAPI marketplace. This will help facilitate integrations and streamline operations effectively. With over 10 years of experience in API development, I specialize in Python and Node.js, which makes me confident in delivering a robust solution that meets your needs. I’ll ensure the API is well-structured, secure, and easy to maintain, using tools like Flask or FastAPI as needed. I’d be happy to go through the details and suggest the best technical approach. To get a better understanding, I have a few questions: Q1 – What specific functionalities do you want the API to support? Q2 – Are there existing systems or APIs that this integration needs to connect with? Q3 – What are your requirements for user authentication and data security? Looking forward to hearing from you.
$50 USD in 5 days
7.8
7.8

Hello, You need a clean, stateless REST API to bridge OrbisAPI with multiple third-party services, with consistent responses and solid auth handling. I’ve built similar adapter-style APIs where each request fetches, transforms, and returns data with zero storage. I’d use FastAPI or Fastify with versioned routes, a provider abstraction layer, and a unified JSON schema. I follow an OpenAPI-first approach to ensure validator compliance from the start, plus Docker packaging, .env config, and unit tests for core/error flows. I’ll also include a sample script covering 2 integrations end-to-end. Do you already have a response schema, or should I define one? Best, Niral
$15 USD in 40 days
7.9
7.9

As a seasoned developer and the leader of a multi-talented team at MHTechFusion, I would be elated to build your RESTful API for OrbisAPI Marketplace. Our core strengths lie in full-stack development using languages like Node.js and Python -- perfect as you mentioned being language-agnostic in your request. We have an impressive track record of producing clean, production-ready code that delights our clients. That means your desired endpoints, authentication schemes, data normalization and OpenAPI specs will all be meticulously crafted with standard HTTP semantics, using the most suitable framework for your needs (such as Express/Fastify or FastAPI/Flask). By choosing us, you won't just receive a generic solution -- we'll take the time to understand your specific third-party API requirements and build a bridge that precisely meets your needs. Furthermore, we're highly experienced with packaging applications into Docker images for easy deployment. So along with concise OpenAPI documentation and comprehensive unit tests to verify expected shapes and status codes of each endpoint, you can expect a well-prepared Dockerfile and clear README too. Finally, at MHTechFusion, we've honed our skills in hosting applications on cloud platforms like AWS, GCP and Firebase using Docker and Kubernetes. We always provide configurable environment variables because flexibility is key to efficient deployment.
$25 USD in 40 days
7.1
7.1

Hi I can build a lean production-ready REST API bridge for the OrbisAPI marketplace using Node.js, FastAPI, or Go, with clean versioned endpoints and container-ready deployment. The main technical challenge is normalising different third-party API responses into one consistent JSON contract while keeping authentication, errors, rate limits, and provider-specific behavior isolated. My approach would be to design provider adapters, handle Bearer token and OAuth2 flows through environment-based configuration, implement standard HTTP semantics, and document every endpoint with OpenAPI/Swagger. I can also create a Dockerfile, README, .env sample, onboarding guide, unit tests, and sample consumer script that proves end-to-end calls against at least two providers. The code will stay stateless with no local database or file storage, making it simple to deploy and maintain. I’ll focus on clean API structure, marketplace-ready documentation, reliable error handling, and easy future expansion for additional providers. Thanks, Hercules
$50 USD in 40 days
6.8
6.8

Hello! I’m Shamshad, ready to build a lean, production-ready RESTful API that cleanly bridges OrbisAPI with your chosen third-party providers. My approach is to design versioned, minimal endpoints (GET/POST/PUT/PATCH/DELETE) that return a consistent JSON surface, while handling Bearer and OAuth2 authentication with each upstream service. I’ll normalise responses into a unified schema, publish a concise OpenAPI spec, and craft an onboarding guide aligned with OrbisAPI marketplace rules. The project will be container-ready with a Dockerfile and a short README, and I’ll include unit tests covering core success paths and common errors using a lightweight framework. I’ll keep all secrets in .env and ensure the code runs without a local DB or file storage. What are the two or three external APIs you want to connect to first, and which authentication method (Bearer/OAuth2) each uses? Your project will ship with a clear folder structure, automated tests, and a sample consumer script that calls at least two upstream APIs end-to-end. I will also provide a minimal CI-friendly setup. If you’ve published similar integrations, I’ll mirror best practices from those to keep things fast, secure, and easy to onboard. Best regards,
$25 USD in 33 days
6.6
6.6

Hi, We’ve built multiple integrations for marketplaces like Shopify and WordPress, where we developed REST APIs to connect with third-party services. We also created a dedicated product for Amazon sellers that used multiple Amazon APIs to fetch and normalize data, which aligns closely with your requirements. For your project, I recommend using Node.js with Express, as it’s lightweight and efficient for handling multiple concurrent requests. We can also implement server-side caching to optimize performance when multiple users request the same data. Let’s schedule a 10-minute introductory call to discuss your project in more detail and ensure I fully understand your needs. I usually respond within 10 minutes. I’m eager to learn more about your exciting project. Best regards, Adil
$22 USD in 40 days
6.7
6.7

Greetings, Which language do you want optimized for long-term maintenance—Node.js (Fastify/Express), Python (FastAPI), or Go? We will design a lightweight, stateless REST API that acts as a clean orchestration layer between OrbisAPI and your third-party providers, ensuring every request is normalized into a consistent JSON schema regardless of upstream differences. Authentication (OAuth2/Bearer flows) will be abstracted into reusable service clients, with strict error handling, retry logic, and rate-limit awareness to keep integrations stable in production. The service will be fully containerized with Docker, documented via OpenAPI (Swagger), and covered with unit tests validating success/failure flows plus a sample end-to-end consumer script for marketplace validation. We have creative UI/UX Designers & experienced Developers team working on different tech stacks, so we will provide you quality services with 5 months FREE support and longterm relationship guarantee FYI. The current bid amount is a placeholder to submit the proposal. Thank you Yasir LEADconcept
$20 USD in 40 days
6.9
6.9

Hello Greetings, After reviewing your project description, I feel confident and excited to work on this project for you. But I have some crucial things and queries to clear out. Please leave a message on chat so we can discuss this, and I can share my recent work similar to your requirements. Thanks for your time! I look forward to hearing from you soon. Best Regards.
$15 USD in 40 days
6.8
6.8

EAN, PRODUCTION-READY API BRIDGES BUILT FOR MARKETPLACES—FAST & CLEAN Hello, your requirement is exactly what I specialize in. With 12+ years building API-first systems and third-party integrations, I’ll deliver a clean, scalable, and fully documented REST service ready for OrbisAPI publishing. Approach: I’ll design a stateless API layer that securely connects to external providers, normalizes responses, and returns consistent JSON—no DB, no overhead. Tech Stack (recommended): Node.js (Fastify) for high performance OR Python (FastAPI) for rapid dev + auto docs Axios/HTTPX for upstream calls JWT/OAuth2 handling layer Dockerized deployment Core Delivery: Versioned REST endpoints (v1) with proper HTTP semantics Auth integration (Bearer, OAuth2 flows, token refresh handling) Response normalization layer (consistent schema across providers) Error handling + retry/fallback logic OpenAPI 3.0 spec (validated for OrbisAPI) + onboarding guide Unit tests (Jest/PyTest) covering success + edge cases Sample consumer script (2+ providers integrated) Dockerfile + .env-based config Workflow: design → integration → normalization → tests → docs → packaging Timeline: Initial working endpoints: 3–4 days Full delivery (tests + docs): 5–7 days Why me: deep experience with API marketplaces, clean architecture, and reliable integrations under real-world constraints. Ready to start as soon as you share the target APIs.
$15 USD in 40 days
6.7
6.7

Dear , We carefully studied the description of your project and we can confirm that we understand your needs and are also interested in your project. Our team has the necessary resources to start your project as soon as possible and complete it in a very short time. We are 25 years in this business and our technical specialists have strong experience in Python, Node.js, RESTful, JSON, Docker, Flask, API Development, FastAPI and other technologies relevant to your project. Please, review our profile https://www.freelancer.com/u/tangramua where you can find detailed information about our company, our portfolio, and the client's recent reviews. Please contact us via Freelancer Chat to discuss your project in details. Best regards, Sales department Tangram Canada Inc.
$25 USD in 5 days
7.6
7.6

⭐⭐⭐⭐⭐ Proposal: Production-Ready RESTful API for OrbisAPI Marketplace We understand your need for a lightweight bridge service that fetches, transforms, and returns data from specified third-party APIs with consistent JSON output, no storage, clean versioning, and full OpenAPI docs. CnELIndia proposes building it in Python using FastAPI for speed, async support, and built-in OpenAPI generation—fully meeting your Docker, .env, and marketplace validator requirements. How CnELIndia team ensures success (step-by-step): Kickoff call: Clarify third-party APIs and auth flows within 24 hours. Design & prototype: Deliver versioned endpoints and normalization logic in 3 days. Development & testing: Implement auth, transformations, Jest/PyTest coverage (success + error paths), and sample consumer script in 7 days. Documentation & packaging: Complete Swagger spec, onboarding guide, Dockerfile, and README to pass OrbisAPI validator. Final review & handover: End-to-end verification and deployment-ready artifacts. Our experienced Python/FastAPI developers have shipped 12+ marketplace integrations with zero post-delivery issues. Ready to start immediately upon your go-ahead—let’s schedule the kickoff! (Total: 12 days)
$20 USD in 40 days
6.4
6.4

Having extensive experience in JSON processing and building APIs with Node.js, I am confident that I can develop the high-quality and production-ready RESTful API you need for your OrbisAPI Marketplace integration. Moreover, my familiarity with the likes of Express and Fastify make me well-versed in designing clean, versioned REST endpoints that follow standard HTTP semantics—a crucial part of your project requirements. My expertise extends beyond basic JSON response handling—I also have a solid background in dealing with different types of authentication mechanisms, including Bearer Tokens and OAuth2, which will come in handy for seamless integration with various third-party APIs. The fact that normalizing response structure is an integral part of this project aligns perfectly with my skills. Bearing in mind your hosting preferences, I will containerize the code effectively, provide you with a Dockerfile and short README as expected. As a seasoned freelancer known for ensuring on-time delivery and producing perfect 5-star work many times over, you can rely on me to complete the task to your satisfaction and within your timeframe. Let's discuss more about the project needs; together we'll deliver an outstanding outcome!
$18 USD in 40 days
6.1
6.1

Hello, I’ve read your RESTful API for OrbisAPI Marketplace and I’m confident I can deliver a clean, production-ready bridge that normalizes multiple upstream providers into a single, consistent JSON surface. I bring 15+ years of full-stack experience (Node.js/Python/Go) with strong REST design, OpenAPI, containerisation, and robust test coverage. I’ll design versioned endpoints with proper HTTP semantics, implement OAuth2/Bearer auth for each provider, and produce a verifiable OpenAPI spec and an onboarding guide that aligns with OrbisAPI’s publishing rules. The code will be modular and container-friendly (Dockerfile included) and I’ll provide unit tests (Jest/Mocha or PyTest) covering success paths and common errors. I’ll also ship a sample consumer script to demonstrate end-to-end calls against two external APIs. I’ve shared an initial estimate based on your description, and once we go over a few technical or functional details, I’ll confirm the exact cost and delivery schedule. What two external providers will you require as the initial integration targets, and do you have any preferred authentication schemes or rate-limit constraints for those providers? Asad- A mentalist-level grasp of the hidden goal here: you want a lean, auditable API bridge that “just works” across vendors, with pristine docs and repeatable deployments, so teams can trust integration uptime without managing state locally. Best regards, Asad
$15 USD in 93 days
6.1
6.1

Hi, I have strong experience building lean, production-ready REST APIs (Node.js/Fastify, Python/FastAPI), including third-party API integrations, OAuth2/Bearer authentication, response normalization, OpenAPI/Swagger documentation, and Dockerized deployments with automated testing. I can build your OrbisAPI integration as a clean, versioned REST service that fetches and transforms data from external providers in real time, with consistent JSON responses, proper error handling, full OpenAPI spec, and a container-ready setup with tests and a sample consumer script to validate end-to-end flows. Best regards, Juan
$20 USD in 40 days
5.8
5.8

This looks like a great fit, I will build your RESTful API — versioned endpoints, OAuth2/Bearer auth handling, response normalization, OpenAPI spec, Dockerfile, and full test coverage. FastAPI is my recommendation here — it auto-generates OpenAPI docs from type hints, which means your OrbisAPI validator compliance comes nearly free and stays in sync with code changes automatically. Questions: 1) How many third-party providers will the API bridge to at launch? 2) Do any of those providers use rate limiting that requires request queuing? Looking forward to your response. Best regards, Kamran
$19 USD in 40 days
6.5
6.5

Hi there, Before development, I can create a free API structure plan (endpoints + response schema + auth flow) so your integration stays clean and consistent across all third-party services. I can build a production-ready REST API using FastAPI or Node.js that fetches, transforms, and normalizes data from external APIs into a consistent JSON structure for OrbisAPI. This will include proper auth handling (Bearer/OAuth2), error handling, and versioned endpoints. My approach focuses on simplicity and reliability—no unnecessary layers, clean code, container-ready setup (Dockerfile), and well-structured OpenAPI/Swagger docs that pass marketplace validation. As an added value, I’ll include a sample consumer script and basic test coverage (success + error cases) so your integration is ready for immediate submission. Regards, Sohail Jamil
$15 USD in 1 day
5.9
5.9

Hello, I’d be glad to help craft a clean and reliable RESTful API for your new OrbisAPI marketplace integration. I can build a lightweight bridge service that fetches, transforms, and returns consistent JSON from the external providers without needing local storage. I’ll keep everything simple and well-documented, including versioned endpoints, authentication handling, and a clear OpenAPI spec ready for validation, plus container-ready packaging and basic tests. Thanks, Teo
$25 USD in 30 days
5.7
5.7

As an experienced Full-Stack Developer, I have a strong track record of delivering high-quality projects on time and with utmost satisfaction. My proficiency in languages like Node.js, Python (Flask/FastAPI), and Go makes me an ideal fit for your RESTful API for OrbisAPI Marketplace project. I’ve got the skills you need to bring your idea to life. One aspect that sets me apart is my keen eye for building clean, versioned REST endpoints that strictly adhere to standard HTTP semantics. I understand the importance of a consistent JSON structure for data coming from various sources and know just how to normalise the responses so that regardless of which upstream service is being queried, OrbisAPI users get exactly what they need. Another advantage of choosing me lies in my containerization prowess. I am highly comfortable deploying Docker images, consequently can easily package the code for a seamless handoff. Furthermore, I value comprehensive documentation and provide an impressive guide which I know will meet OrbisAPI’s publisher docs formatting rules perfectly. Let's make your integration on OrbisAPI a resounding success. Contact me today and let's bring your project to fruition!
$20 USD in 40 days
5.8
5.8

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