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I need a developer who can create a reliable bridge between the Check24 platform and Hostaway. The sole focus is data synchronization—no payment processing or additional booking management logic for now. Scope • Pull new and updated booking data plus related customer records from Check24 and push them to Hostaway, and vice-versa where applicable. • Run the sync every minute with solid queue or webhook logic so neither side is overloaded. • Map all relevant fields (guest details, reservation status, dates, channel references, etc.) and handle edge cases such as cancellations or modified stays. • Build clear error handling, retry logic, and concise logging so I can audit what was sent and when. • Deliver concise setup instructions along with commented source code (preferably Python or Node.js, but I’m open to other robust solutions). • Provide a brief test suite or Postman collection so I can replicate the calls and confirm everything works before we go live. Access to both APIs and basic credentials will be supplied once we start. If you’ve previously integrated travel or property-management APIs, please highlight that experience.
Project ID: 40630097
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182 freelancers are bidding on average €226 EUR for this job

Hi, I have gone through the Check24-Hostaway API Sync project. This automation and integration looks straightforward at first, but details such as API authentication, field mapping, update frequency, duplicate handling, and error recovery can cause issues later. I can outline a practical approach for a reliable two-way sync. I have over 10 years of experience in PHP, JavaScript, Python, Node.js, data processing, software development, API development, and microservices, and I'm excited to be part of your project. For more information about my work, feel free to check my profile: https://www.freelancer.com/u/microlent Let's discuss the required Check24 and Hostaway data flows in the chat so I can recommend the most practical and cost-effective solution. ~ Rajesh
€140 EUR in 7 days
9.5
9.5

Hi, I can build this Check24 ↔ Hostaway sync in a clean and reliable way, with the focus exactly where you want it: reservation/customer data synchronization, edge-case handling, and audit-friendly logging. I’ve worked on API-driven integrations where stability, retries, and clear mapping matter more than flashy extras. I’d structure it so updates are processed safely without hammering either API, and I’ll include concise setup instructions plus a test collection for verification. If you want, I can also outline the sync flow clearly before we begin.
€140 EUR in 7 days
9.4
9.4

Hello, A2 Design can build a reliable Check24–Hostaway synchronization bridge focused strictly on booking and customer data exchange, with no unnecessary payment or booking-management logic. We’ll handle one-minute sync cycles using safe queue/webhook logic, field mapping for guest details, dates, statuses, channel references, cancellations, modified stays, retries, audit-friendly logs, and a small Postman/test suite for pre-launch validation. We have strong experience with booking workflows, automation, and API-driven systems. For example, MadPaws is a high-volume booking marketplace with sitter search, booking flow, profiles, and payment logic built in Laravel/React: madpaws.com.au. ScheduleSite also demonstrates our experience with calendar-based data, aggregation, sync, and notifications: schedulesite.com. We can implement this in a robust backend stack such as Node.js, Python, or PHP/Laravel depending on API requirements and your hosting preference, with clean commented source code and setup instructions. Let’s connect to review the Check24 and Hostaway API details and define the exact sync rules before implementation.
€100 EUR in 1 day
8.8
8.8

Hi, I can create a reliable bridge for data synchronization as you described. With my experience in building API integrations, I’ll implement a robust solution that syncs data every minute, handling updates seamlessly, even during cancellations or modifications. I’ll include clear error handling and logging capabilities, along with comprehensive setup instructions and commented source code, preferably in Python. Additionally, I’ll provide a test suite to ensure everything functions correctly before going live. Let’s discuss your needs further. I’m confident I can deliver an efficient synchronization solution. Best Regards, Priyanka
€140 EUR in 2 days
8.4
8.4

As an established software development company proficient in JavaScript and Node.js, we have significant experience building robust API integrations. Our expertise aligns perfectly with your project's requirements for creating a reliable bridge between Check24 and Hostaway, specifically focusing on seamless data synchronization. Having previously worked on similar travel or property management API projects, we are uniquely positioned to ensure that the integration not only successfully pulls and pushes data but also skillfully handles edge cases like cancellations or modified stays. In conclusion I believe my team and I have both the tech proficiency and relevant experience to pull off this intricate API sync for you. With our services, you'll be getting a blend of deep technical knowledge, excellent project management skills that emphasize clear error handling logging and retry logic, thoroughness in planning for unforeseen edge cases while ensuring smooth scalability for future adjustments.
€50 EUR in 1 day
8.2
8.2

Hi, I can build a reliable bridge between Check24 and Hostaway focused entirely on data synchronization. The integration will sync new and updated bookings, map all required fields, handle cancellations and reservation changes, include retry/error handling with clear logs, and provide a Postman collection plus setup documentation for testing before deployment. With 10+ years of development experience, I focus on building stable API integrations that are easy to maintain and monitor. Once API access is available, I can review both endpoints and implement an efficient sync process without overloading either platform. Thank you Regards, Sai
€220 EUR in 7 days
8.1
8.1

A dependable two-way bridge between Check24 and Hostaway comes down to getting idempotency, field mapping, and edge cases like cancellations and modified stays right — and that's exactly the kind of property-management API integration I've built before. I'd develop it in Python (FastAPI) with a Redis/Celery queue, using Hostaway webhooks where available and a 1-minute polling fallback, backed by a sync-state table with per-record hashing so we only push genuine changes and never overload either side. Every field — guest details, reservation status, dates, channel references — goes through an explicit mapping layer, with exponential-backoff retries, a dead-letter queue, and concise audit logs showing exactly what was sent and when. You'll get commented source, setup docs, and a Postman collection to verify everything before go-live. Once you share the credentials, I can start straight away.
€30 EUR in 1 day
7.6
7.6

Hi, The heart of this is bidirectional sync that stays consistent under a one-minute cadence, so I'd run it webhook-first with a queue fallback, idempotency keys on both sides to avoid double-writes, and a state table so cancellations and modified stays reconcile cleanly rather than overwriting. One question: does Check24 push booking webhooks, or is polling the only option? That decides the queue design. We've built travel and property booking platforms with API integrations, payments, and messaging on Python and Node backends. IndyGuide: a travel platform connecting travelers with verified local guides and hosts, built on Python and AWS. Since this is fixed, we can start with a milestone on the read-side sync plus logging so you only release on delivered work. Adil
€154 EUR in 7 days
7.5
7.5

Hello, I am very interested in your project involving creating a reliable bridge between the Check24 platform and Hostaway for data synchronization. I have a strong expertise in PHP, JavaScript, Python, Software Development, Node.js, API Development, and Data Processing, which aligns well with the requirements of this project. I understand the scope of the project, which includes pulling and pushing booking data between Check24 and Hostaway, implementing solid queue or webhook logic for sync frequency, mapping relevant fields, handling edge cases, and providing clear setup instructions and source code. - MY WORK STATS: ✨ https://www.freelancer.com/u/XanvraTECH I suggest a follow-up discussion to further delve into the project details and how I can contribute effectively to its successful completion. Best regards, Warda Haider
€100 EUR in 4 days
6.8
6.8

Greetings, I am a Full Stack integration developer with extensive travel and property-management API experience. I'll build a reliable Check24 to Hostaway data synchronization bridge with one-minute sync intervals using queue or webhook logic, complete field mapping for bookings and customer records, robust error handling with retry logic, and comprehensive audit logging. I'll deliver setup instructions, well-commented source code in Python or Node.js, and a Postman test suite for validation. Have you obtained API credentials from both Check24 and Hostaway? Better we do a quick chat to ensure few things about the task. Ping me when you're available.
€140 EUR in 7 days
7.1
7.1

Hello, I'd be happy to develop a reliable, production-ready integration between Check24 and Hostaway, with a strong focus on accurate, real-time synchronization and fault tolerance. I'll build a robust service in Python or Node.js that synchronizes bookings and guest records in both directions where supported, using webhooks or an efficient polling mechanism to maintain one-minute sync intervals without overloading either API. The integration will include comprehensive field mapping for reservations, guest information, booking status, dates, channel references, cancellations, and booking modifications. I'll also implement intelligent retry logic, detailed logging, queue-based processing where appropriate, and thorough error handling to ensure data consistency even during temporary API failures or network interruptions. The final solution will be clean, well-documented, and easy to maintain, including commented source code, setup instructions, and a Postman collection or test suite so you can validate every endpoint before deployment. I look forward to reviewing the API documentation and building a scalable integration that keeps both platforms perfectly synchronized.
€30 EUR in 1 day
7.3
7.3

With my extensive experience in API development and a strong command over renowned platforms such as JavaScript, Python and Node.js, I am the perfect candidate to build a robust bridge between Check24 and Hostaway for you. Having worked on several similar projects before, I understand the intricacies involved in handling travel or property-management APIs, which will aid in the smooth synchronization of your data. Apart from my technical prowess, my ability to diligently map fields while addressing potential issues like cancellations or modified stays, setting up webhooks for minute-by-minute syncs without system overload, offering concise setup instructions with detailed logging - all add up to make your project even more efficacious. Additionally, I believe in assuring holistic deliverance by providing necessary post-development tools like commented source code and Postman collection for future debugging and replication. Moreover, I take immense value in precise communication and aim at keeping you updated throughout the development process so that there are no surprises at any stage. Remember, your satisfaction is my utmost priority. So let's synchronize your travel booking data seamlessly while you rest easy knowing it’s being taken care of by a seasoned professional like me!
€150 EUR in 5 days
6.7
6.7

Hi there, I can implement a reliable data synchronization bridge between the Check24 platform and Hostaway using Node.js, which can efficiently pull and push booking data along with customer records. The sync can be scheduled to run every minute to avoid overloading either API, ensuring smooth operation and handling of edge cases like cancellations. Along with concise setup instructions and clear logging for auditing, I can also provide a brief test suite to confirm the functionality before going live. Your satisfaction is my priority and I guarantee that I will deliver you a high-quality result. Regards, Ali
€30 EUR in 1 day
6.4
6.4

Hello, I have carefully read your project details, and I understand you need a dependable synchronization bridge between Check24 and Hostaway that focuses solely on accurate, near real-time data exchange. I will develop a robust integration that synchronizes bookings, guest information, reservation statuses, cancellations, modifications, and channel references while ensuring data consistency, reliability, and minimal API load. I will build the service using Python or Node.js with a modular architecture, utilizing webhooks where available and intelligent scheduled polling every minute when required. The integration will include comprehensive field mapping, retry mechanisms, queue-based processing, duplicate prevention, structured logging, and detailed error handling. I will also provide well-documented source code, setup instructions, and a Postman collection or test suite to simplify deployment and future maintenance. Do both Check24 and Hostaway provide webhook support for booking updates, or should the integration rely entirely on scheduled polling? Are there any custom Hostaway fields that also need to be synchronized? I have experience building reliable third-party API integrations with a strong focus on scalability, maintainability, and data integrity. Let's discuss your API documentation and deliver a production-ready synchronization solution. Best Regards, Rabia Shaikh
€200 EUR in 3 days
6.4
6.4

Hi, Looks like the main challenge is keeping Check24 and Hostaway in sync without overwhelming either API, especially when handling cancellations, updates, or conflicts on both sides. API performance during peak times will shape the sync's rate and reliability, so queueing or webhook logic must handle temporary failures gracefully. I’ve built similar data bridges before, including a Node.js system that synced booking data between two travel platforms—mapping disparate schemas and managing edge cases like cancellations or modified stays. That project used a queue to avoid overloading APIs, with retries and exponential backoff, and I can adapt that approach here. I’d start by mapping the schemas to spot mismatches (e.g., guest details or dates not aligning directly). A lightweight job would run every minute but respect rate limits, retrying failed requests with backoff and logging errors clearly. Field normalization will likely be the trickiest part. A key risk is API changes breaking the sync unexpectedly. We’d mitigate that by versioning the mapping logic and validating responses before pushing data. Another unknown is how often cancellations or modifications occur—if frequent, we’d need conflict detection; if rare, simpler deduplication might suffice. Thanks, Denis
€30 EUR in 3 days
6.5
6.5

Hello! We can build a reliable data sync bridge between Check24 and Hostaway for your booking flow. 1. Do you want the sync to run through webhooks, polling, or both? 2. Which side should be the source of truth for conflicts and updates? — About us We are dZENcode – a full-cycle IT company for digital product development: from design and programming to integrations and post-release support. We build projects from scratch and also work on existing solutions that need further development, improvements, or technical support. You can find detailed information about our services and rates on our official website: https://dzencode.com. Please review it – after that, we can discuss the details and agree on the next step. ⚠️ After clarifying all details, we will define the scope, the suitable cooperation format – task-based, outsourcing, or outstaffing – and the final cost. Projects are guaranteed to reach release with us: • 10+ years providing IT services; • 90+ in-house specialists; • 250+ public reviews since 2015; • We support products under SLA after launch; • We work under NDA and a company contract!
€140 EUR in 7 days
6.7
6.7

Hi, I can build this as a dedicated synchronization service with a canonical reservation model between Check24 and Hostaway. The integration would use official APIs and webhooks where available, with scheduled incremental polling only for events that cannot be pushed. Each reservation and guest record would be mapped through versioned adapters, preserving external IDs, timestamps, source channel, status, stay dates, contact details, and modification history. Idempotency keys and mapping tables would prevent duplicate bookings, while explicit rules would handle cancellations, changed dates, partial updates, missing fields, and out-of-order events. I recommend Node.js with TypeScript or Python/FastAPI, backed by PostgreSQL and a durable queue. The service would include rate limiting, exponential retries, dead-letter handling, reconciliation jobs, structured audit logs, health checks, and alerts. Credentials would remain encrypted and outside the source code. A true bidirectional flow would only be enabled for fields and operations officially supported by both platforms. Delivery includes documented source, Docker setup, environment templates, migrations, field-mapping documentation, automated tests, and a Postman collection. Relevant examples can be shared privately where client permissions allow. Regards, Houssame
€140 EUR in 7 days
6.7
6.7

Hi, I’ve worked on API integration projects with similar goals and challenges, so I understand the importance of building a dependable sync layer between platforms where reservation and guest data must stay accurate. Integrations like this require careful handling of API limits, field mapping differences, duplicate records, and booking changes. I’ll develop a reliable Check24–Hostaway bridge with scheduled synchronization, queue-based processing, validation, and detailed logging. I’ll map reservation and customer fields, handle updates and cancellations, and implement retry mechanisms so failed syncs can recover without data loss. I’ll provide clean commented source code, setup instructions, and a test suite/Postman collection for verification. The final solution will be structured for easy maintenance and future expansion. Best Regards, Fizza
€70 EUR in 3 days
5.9
5.9

Hi, I understand you need a reliable, minute-by-minute sync between Check24 and Hostaway that moves bookings and guest records both directions, maps fields, and handles cancellations and modifications without touching payments. The main technical risk is API rate limits and duplicate or out-of-order events, which can create inconsistent reservation states. My practical approach is to prefer webhooks where available and fall back to incremental polling; funnel incoming events into a small queue (Redis or RabbitMQ) and process them with idempotency keys and a mapping layer (Python or Node.js). I'll add retry/backoff, concise logging and audit entries, and a Postman collection plus commented code and setup notes so you can reproduce tests. I’d usually start by confirming supported webhook events and rate-limit windows. Do both Check24 and Hostaway provide webhook endpoints for reservation events, or will one need polling? Thank you, Andrew
€14,400 EUR in 10 days
5.9
5.9

Hi, I'm interested in your requirements. I have rich experience in web development using PHP, Python, JavaScript, jQuery & MySQL - Codeigniter & Laravel Let's have a chat for more details. Thanks!
€190 EUR in 7 days
5.7
5.7

Stuttgart, Germany
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