I connect your CRM to every system in your business -- website, messaging platforms, accounting, e-commerce. No more manual data entry, no more lost leads, no more disconnected workflows.
Your CRM should be the single source of truth for your business. But in reality, most companies end up with data scattered across spreadsheets, email inboxes, messaging apps, and disconnected tools. Sales teams waste hours copying data between systems. Leads fall through the cracks because nobody saw the WhatsApp message in time. Reports are inaccurate because the data is outdated by the time it reaches the CRM.
CRM integration solves this by connecting your CRM to every tool your business uses -- automatically, in real time, with no manual work required. When a lead fills out a form on your website, it appears in your CRM instantly. When a customer messages you on WhatsApp, the conversation is logged in the CRM. When a deal closes, your accounting system generates the invoice automatically.
I am Kirill Strelnikov, a freelance Python/Django developer based in Barcelona. I specialize in building custom CRM integrations that go far beyond what off-the-shelf connectors like Zapier can do. My integrations handle complex business logic, bi-directional data sync, error recovery, and scale with your business. I work with companies across Europe and deliver production-ready integrations with fixed-price contracts.
Every business has a unique stack of tools. Here are the three main categories of CRM integrations I build, each solving a distinct set of data and workflow problems.
Lead capture forms that create CRM contacts automatically. Deal pipeline updates triggered by user actions. Personalized website content based on CRM data. Visitor tracking and lead scoring synced to your CRM in real time.
Connect your CRM to WhatsApp, Telegram, email, and SMS. Every customer conversation is logged automatically. Lead qualification bots that create and update CRM deals. Automated follow-up sequences triggered by CRM events.
Sync your CRM with accounting, e-commerce, ERP, helpdesk, and project management tools. Bi-directional data flow ensures every system has accurate, up-to-date information. Automated invoicing, order tracking, and support ticket creation.
I work with all major CRM platforms: HubSpot, Salesforce, Pipedrive, Zoho CRM, and custom-built CRMs. If your CRM has an API, I can integrate it. For messaging integrations, see my WhatsApp automation and Telegram bot development services.
I use a proven stack designed for reliable, real-time data synchronization between systems. Every component is chosen to handle the specific challenges of CRM integration: API rate limits, data consistency, error recovery, and background processing.
Integration layer: I build API-first integrations using official CRM APIs with proper OAuth 2.0 authentication. Webhook listeners capture real-time events from your CRM and connected systems. All API calls include retry logic, rate limit handling, and error logging.
Background processing: Celery with Redis handles asynchronous data sync, batch operations, and scheduled tasks. This ensures your integration stays fast and reliable even under heavy load. Failed operations are automatically retried with exponential backoff.
Data layer: PostgreSQL stores sync logs, field mappings, and transformation rules. A dedicated sync engine handles deduplication, conflict resolution, and data validation before writing to any system.
Every integration project follows a structured process that ensures your data flows correctly from day one. Here is what to expect.
I start by mapping every system your business uses and understanding how data currently flows between them. I identify manual bottlenecks, data inconsistencies, and integration points. This phase takes 2-3 days and results in a clear integration plan with a fixed-price estimate.
I design the integration architecture: which APIs to use, how data fields map between systems, sync direction and frequency, error handling strategy, and authentication flow. You review and approve before development begins.
I build the integration in phases, starting with the most critical data flows. You see working sync within the first week and can verify data accuracy at every step. Each phase is tested with real data before moving to the next.
Comprehensive testing with your production data in a safe environment. I verify field mappings, handle edge cases, test error recovery, and run parallel syncs to ensure accuracy. Historical data migration is included when needed.
Go-live with monitoring dashboards that track sync status, errors, and data volumes. I provide documentation for your team and offer ongoing support packages for maintenance, API updates, and new integration points.
Here are real projects that demonstrate my approach to CRM integration. Both delivered measurable business results by eliminating manual work and improving data accuracy.
Developed custom loyalty systems with point accrual, event-based automatic triggers, and deep CRM integration via API. Built product feeds for Google Shopping and Telegram channels that sync directly from the CRM. The integration eliminated manual data entry, automated customer segmentation, and resulted in higher repeat sales and reduced customer churn.
Built a Django platform with automatic synchronization and import from external data sources. Advanced filters and an SEO-optimized structure ensured leads found the right listings. The automated data pipeline replaced hours of manual data entry per day and increased lead flow through organic search.
CRM integration delivers the highest ROI for businesses that already use a CRM but are not getting full value from it. Here are the situations where custom integration makes a real difference:
If your team spends more than 5 hours per week on manual data entry between systems, CRM integration will pay for itself within weeks. Book a free consultation to discuss your specific case.
Transparent pricing based on integration complexity. All prices include development, testing, data migration, documentation, and 30 days of post-launch support. Final cost confirmed after the discovery phase.
Need a custom scope or integration with a system not listed here? Get in touch and I will provide a tailored proposal within 24 hours.
Kirill Strelnikov is a freelance Python and Django developer based in Barcelona, Spain. He specializes in CRM integrations, API development, and business automation. He has delivered over 15 commercial projects for clients across Europe, including CRM-connected loyalty systems, automated data pipelines, and multi-system integrations for sales teams.
His core tech stack includes Python, Django, PostgreSQL, Redis, Celery, Docker, and extensive experience with CRM APIs (HubSpot, Salesforce, Pipedrive). He works exclusively with fixed-price contracts -- you know the exact cost before development begins. Communication in English, Spanish, and Russian.
Learn more on the about page or explore the full portfolio.
Tell Kirill about your CRM and the systems you need to connect. He will propose an integration plan, estimate the timeline, and give you a fixed price -- all within 24 hours. Free consultation, no commitment.
Book a free CRM consultation