Set up synchronization of two data sources with the CRM and eliminate desynchronization.

Budget: 8000 UAH Deadline: 7 days

Good day. I can help figure out the reason for the desynchronization and set up correct synchronization between the data sources and the CRM. Please let me know:
1. Which CRM is being used and which two data sources need to be synchronized?
2. How is the synchronization currently implemented (API, webhooks, SQL, third-party service, etc.)?
3. How often does desynchronization occur and are there examples of records where it manifests?
4. How are entities currently matched between the two sources if the names and identifiers differ?
5. Is it only necessary to find and fix the problem, or is there also a need to refine the synchronization logic to prevent such cases in the future?

Budget: 5000 UAH Deadline: 2 days

Hello. I am ready to help. To assess, I need to familiarize myself with the current code.

Budget: 10000 UAH Deadline: 4 days

Hello!
I have extensive experience in integrations.
Write to me, I would be happy to work with you!

Budget: 6000 UAH Deadline: 4 days

Hello. The problem is typical: if the data changes after the first synchronization, and there is no trigger for an update, a desynchronization occurs. Different names and IDs for the same entity are resolved through mapping.

How we will fix the problem:

Mapping Table: We will create an intermediate reference table that links source_ID_1, source_ID_2, and ID_in_CRM. The system will clearly know that this is the same entity, regardless of the differences in names.

Tracking changes by timestamp: We will set up a check by the update date (updated_at). As soon as a field changes in any source, the script will make a new request to the CRM and update the record.

Queue and priorities: We will outline the collision logic — which source is primary (has higher priority) if the data has been updated in both places simultaneously.

Timeline: 3-4 days for auditing the current code, creating the relationship table, and testing.

Question: Which CRM are you using, and what is the current synchronization script written in (Python, PHP, or a connector like Make)? Expand

Budget: 2500 UAH Deadline: 4 days

Good day! I have been creating CRM connections with external sources via API, and such desynchronization almost always has two causes. The first is that there is no trigger for changes at the source, so any edits that occurred after the first synchronization are not pulled in. The second is that there is no stable matching key when the same entity is named differently in two databases. Could you please specify which source systems and CRM you are using, and whether there is a "change date" field or webhooks to capture edits?

Budget: 2500 UAH Deadline: 4 days

Good day! I do exactly such integrations and data synchronizations with CRM — and most often the "desynchronization" lies in exactly two places, which you described.

According to your hypothesis: if data changes in one of the sources after the initial synchronization — an incremental delta synchronization is needed, not a one-time one: catching changes by updated_at / webhook of the source (and where there are none — by periodic reconciliation), and supplementing the CRM. The second point — different names/identifiers for the same entities — is resolved with a mapping layer: a stable mapping key + a correspondence table, so the system understands that this is one object, not two.

First, I would look at the current flow, find the records that are "diverging," and reconcile the two sources against the CRM — to accurately localize where exactly the changes are getting lost.

One clarification to assess more accurately: what are these two sources (which systems / do they have APIs) and does at least one of them provide a change indicator — updated_at or webhook?

Approximately 3-4 days. I set a starting price — I am gathering initial reviews on Freelancehunt, so I am making it advantageous; I will finalize it after I look at your current setup. I am ready to show live examples of my bots/integrations in the chat.

Petro Pankov, BotCraft Group Expand

Budget: 18000 UAH Deadline: 5 days

Evaluation for the first technical stage - 18,000 UAH and 5 working days. This stage includes diagnosing the cause of desynchronization, checking logs or change history, mapping entity correspondence, synchronization adjustments, and a control run on some problematic records.

We can keep it simple - it seems the key here is not just in re-importing, but in the rule that serves as the main source of truth after the initial synchronization. If the same entity has different names or identifiers, a stable mapping key needs to be added, along with processing changes after the first record and a conflict log; otherwise, desynchronization will return.

> Which CRM is being used and what are the two data sources?
> Is there a stable entity ID in the sources, or is the mapping currently done by name?
> Should changes only be pulled into the CRM, or is two-way synchronization needed?

Similar task examples:
> https://business.ingello.com/forma-crm - CRM with business logic, roles, and data processing
> https://business.ingello.com/iks - corporate system with integrations and complex accounting logic

Main page for our system projects for the marketplace:
> https://systems-fl.ingello.com/ua

After gaining access to the test environment or a fragment of logs, I will be able to say more accurately whether this is the first stage for 5 days or if we need to separately plan for the migration of old records =/ Expand

Budget: 2000 UAH Deadline: 7 days

Hello, I worked on data synchronization between Pipedrive and external sources — I set up a bidirectional sync for 50k+ records with minimal discrepancies (

Budget: 4000 UAH Deadline: 2 days

Good day. I looked at the task — it's a classic problem with eventual consistency between sources and the CRM. To eliminate the desynchronization, it is necessary to: 1) set up change tracking after the initial synchronization (change tracking or timestamp-based polling), 2) build a mapping table to link different identifiers of the same entities between sources. For a more accurate estimate — please let me know which CRM is being used and in what format the data is stored in the sources (SQL, API, files)? I am approximately ready to deliver in 2 days after clarifying the details.

Budget: 5000 UAH Deadline: 5 days

Hello. I will set up reliable synchronization of two sources with the CRM: record matching, idempotency, conflicts, retries, and error logging. First, I will find the cause of the desynchronization. The price is negotiable.

Budget: 2000 UAH Deadline: 2 days

Good day, Vyacheslav!

The symptoms indicate two typical reasons, which you have mentioned yourself: changes in the source after the initial synchronization are not "caught," and the entities do not have a common key. But before fixing anything, I would measure this.

I suggest starting with diagnostics (1-2 days): I will compare the snapshots of both sources against the CRM via SQL and provide a report of discrepancies — how many records differ, which specific fields, whether it's a one-sided desynchronization or mutual, and where changes are lost. After this, you will know the scale for sure, and I will give a fixed estimate for the correction: a mapping table of ID correspondences + delta synchronization by updated_at or webhooks + conflict log.

This is my daily work: for over 3 years, I have been building integrations of advertising platforms (Facebook, Criteo, Allegro, RTB House) with BigQuery on Python — there, the same entities have different IDs in each system, so I constantly work on mapping layers and delta logic.

Two questions: do the entities have a natural key (email, phone, external_id)? And what is the approximate percentage of records that differ?

Diagnostics — 2000 UAH, 2 days. Further — based on the results of the report. Expand

Budget: 7000 UAH Deadline: 3 days

Hello! From the description, this seems more like a "one-time fix" rather than a synchronization logic issue: different identifiers for the same entities, changes after the initial sync, and the absence of rules for updating already created records.

I can start with a short audit: look at two data sources, CRM, key fields for matching, where exactly the desynchronization occurs, which changes should update the CRM and which should not. After that, I will propose a scheme: a single key/mapping, upsert rules, error logging, manual verification of disputed records, and a test scenario on a small sample.

My profile includes CRM logic, business processes, integrations/API, and automation. If the audit reveals that deep backend modifications are needed, this can be separately handed over to a developer with a clear specification.

Budget: 1234 UAH Deadline: 1 day

Hello, I have relevant development experience.
Message me privately, we will discuss the details.
I will be happy to help you!

Budget: 17999 UAH Deadline: 5 days

The problem you described is a classic pain of distributed systems. When data "falls apart" after the initial contact, we are usually dealing with a race condition. Your current architecture most likely operates on a fire-and-forget principle, meaning it only captures the moment of entity creation but ignores its further life.

Regarding different identifiers and names, implementing an abstraction layer (Data Mapping Layer) and an ID Mapping Table will help here. This is when the system clearly knows that user_id: 102 in Source A and client_no: AX-99 in Source B refer to the same live manager or client in your CRM.

I will audit the current integration logic, identify the bottlenecks where updates are lost (due to queues, timeouts, or lack of webhooks on data changes), and set up reliable delta synchronization or event triggers.

Budget: 2500 UAH Deadline: 7 days

Hello! I can help figure out the reason for the desynchronization and set up stable data updates between the sources and the CRM. First of all, I would check the synchronization logic, handling of duplicate changes, and entity mapping if different identifiers are used in different systems.

Could you please let me know which specific CRM and data sources are being used?

Budget: 22000 UAH Deadline: 11 days

Hello! The problem you described is a classic case of "Data Drift" and the lack of a unified entity mapping. The hypothesis is absolutely correct: without an event model or delta tracking after the initial import, the system will always lose data updates.

I have extensive experience in database design and synchronizing complex APIs. I am ready to conduct an audit of the current logic and implement a reliable architectural solution.

My treatment plan for the system:
1. Entity Dictionary (Mapping Table): I will create a cross-reference table that will tightly link different identifiers and names from two sources and the CRM into a single entity.
2. Event Update (Delta Sync): I will set up webhook processing for data changes in the sources or an optimized cron script that checks only modified objects by the `updated_at` marker.
3. Reconciliation Loop: I will implement a nightly background task that compares control data in the sources and CRM, automatically resolving desynchronization caused by network failures.

Project assessment by stages (this division protects against architectural risks):

Stage 1: Audit of logs, current code, and architectural conclusion
- What we do: we analyze why the data is "drifting," check API limits, and compatibility of the development stack.
- Duration: 3-4 working days.
- Cost: 6,000 UAH.
*If at this stage it turns out that the technology stack is incompatible or the system requires a complete rewrite in another language - you will receive a detailed technical audit and a problem map, and we will amicably close the collaboration.

Stage 2: Development, mapping, and testing of the pipeline
- What we do: create a cross-reference table, set up Delta Sync, and launch the nightly reconciliation loop.
- Duration: 5-7 working days.
- Cost: 16,000 UAH.

Total budget: 22,000 UAH.
Total duration: 8-11 working days.

I guarantee protection against duplicates (idempotency) and preservation of API limits. I am ready to take a look at the synchronization code in the chat! Expand

Budget: 6000 UAH Deadline: 4 days

Hello!

I understand the task — and it’s immediately clear that there are actually two different problems that need to be separated, because if we act blindly, the desynchronization will return.

The first — changes that come after the initial synchronization are not always pulled in. This is classic: the initial sync worked, but then the system doesn’t “see” that something has changed in the source. The key here is reliable delta catching: based on which markers (updated_at / version / change log / webhook) the source signals about the edit, and ensuring that the CRM retrieves the changes, not just the initial state.

The second, and without it the first cannot be fixed — is that one entity in two sources has different names/IDs. As long as there is no stable mapping of “this is the same object,” the sync will confuse records, and desynchronization will keep returning again and again. Therefore, I am laying down an identification layer: matching by stable characteristics + a correspondence table, so that the system clearly knows that record A from one source = record B from another.

I would start not with rewriting the sync, but with diagnosing your actual desynchronizations — to confirm the hypothesis and see exactly where the changes are getting lost, rather than guessing. One clarification, as this affects the mechanics: what are the two sources (which systems) and do they have timestamps for changes / webhooks, or just “give me everything”? Write to me — we will discuss the project details.

Budget: 5000 UAH Deadline: 5 days

It is necessary to find out why some records after the initial synchronization are "behind" the current state in the sources, and to close this gap, considering that the same entities in different sources have different identifiers.

Approach: first, audit the desynchronized records through SQL comparisons of snapshots from two sources and the CRM to understand the pattern (which fields are "behind," how often, in which source). Next, I will set up a change tracking mechanism: either CDC/triggers at the database level or checking by updated_at with delta sync. For the issue of different identifiers, I will build a mapping table with a one-to-one relationship between the keys of the two sources and the CRM identifier.

What is the DBMS for each of the sources and the CRM, and is there currently an updated_at field or its equivalent in the tables where changes are recorded?

Budget: 3800 UAH Deadline: 3 days

Good day! The most common reason for such desynchronization is changes in one of the sources after the initial synchronization, so incremental delta synchronization is needed based on updated_at or a webhook, plus a mapping table for divergent identifiers. First, I will reconcile both sources against the CRM to accurately locate where the changes are being lost. Please let me know which systems these are and whether any of them provide a change indicator (updated_at/webhook)? Approximately 3 days for diagnostics and corrections.

Budget: 6000 UAH Deadline: 3 days

Good day! The task is clear: the sync generally works, but some entities are "spreading out" — because changes in one of the sources occur after the initial sync and do not always reach the CRM, plus identical entities have different IDs/names in the two sources.

Here’s how I solve this:

Tracking changes after the initial sync — change tracking (webhooks or polling for updated_at, depending on what the source provides), so that late edits are guaranteed to be captured.
Mapping layer — a table of ID/name correspondence between sources with normalization and fuzzy matching where keys do not match exactly, so that identical entities are stitched together into one.
Verification with the discrepancy log — to see exactly what and when desynchronized, rather than catching it manually.
To provide an accurate timeline and price, please let me know:
— which CRM and what the two data sources are;
— in what format the data is in the sources (SQL/DB, API, files) and where the sync itself is currently running;
— approximate volume of records.

After clarifications — realistically from 2–3 days. Ready to connect immediately and diagnose. Expand

Budget: 2000 UAH Deadline: 7 days

Good day! We have experience in debugging complex integrations and resolving data conflicts in CRM. We implement this through the configuration of triggers for record updates and the introduction of a state reconciliation mechanism, which will eliminate discrepancies. We will conduct an audit of the exchange logic and ensure data consistency between sources.

Budget: 10000 UAH Deadline: 5 days

Hello!
We have experience in CRM integration, data synchronization between different systems, and identifying the causes of desynchronization. We are ready to conduct an audit of the current exchange logic, find the reason for the loss of relevant data, and implement reliable synchronization.
We will analyze the update process in both sources, set up correct change tracking, match different identifiers and names of the same entities, and resolve conflicts during data updates. After completing the work, we will conduct testing and provide recommendations for the stable operation of the system in the future.
We would be happy to familiarize ourselves with the project architecture and discuss the details of collaboration.

Budget: 6000 UAH Deadline: 3 days

The task appears to be finding the cause of desynchronization between two data sources and the CRM, rather than a complete overhaul of the integration.

What needs to be done:
• check the logic of the current synchronization and find at which stage updates are lost;
• analyze which data changes after the initial synchronization and why they do not make it to the CRM;
• set up correct updates for changed records;
• match entities that have different names or identifiers in both sources to avoid duplication and errors;
• test the synchronization after the changes are made.

For an accurate assessment, I would like to clarify which specific CRM and data sources are being used and how the synchronization is currently implemented (API, webhooks, SQL, or another mechanism).

Budget: 4444 UAH Deadline: 1 day

Good evening, Vyacheslav. I want to learn more about the task and, as agreed, start working. I am ready to begin today or tomorrow.

Budget: 8000 UAH Deadline: 3 days

Good day, I will handle the desynchronization without any problems - this is a typical task when changes in one of the sources occur after the initial synchronization and do not trigger updates in the CRM. I will set up the logic for processing changes (delta sync or event-driven approach), and I will resolve the issue with mapping identifiers between sources. I have over 5 years of experience with databases, integrations, and automation. I look forward to your message in private!

Budget: 4000 UAH Deadline: 2 days

Feel free to contact me, I will do it.

Budget: 1000 UAH Deadline: 1 day

Good day, Viacheslav.

Your data will be reliably synchronized between sources and CRM without losses and duplicates. First, we will conduct an audit of the current process: we will identify why changes in one of the sources do not always reach the CRM and eliminate this cause. Next, we will set up correct mapping of entities with different names/identifiers using a flexible mapping mechanism. We will ensure real-time change tracking (webhooks or periodic comparisons) and automatic conflict resolution. The result will be consistent data in the CRM without manual intervention.

Stages:

- Analysis of the current synchronization process
- Identification of desynchronization causes
- Development of a change tracking mechanism
- Configuration of identifier mapping
- Testing and validation
- Implementation and monitoring

Options:

- Basic
8000–12000 UAH
Fixing critical synchronization errors and one-time resolution of desynchronization.
- Complete elimination of the current data desynchronization in CRM
- Fixing the root cause of update loss from one source
- Stable operation of the basic data flow without duplicates
- Report on corrections made and system stability

- Standard
15000–25000 UAH
Complete setup of automated synchronization with flexible entity mapping.
- Automatic mapping of entities with different identifiers
- Implementation of a real-time change tracking system
- Full data consistency between two sources and CRM
- Mechanism for automatic conflict resolution during data updates
- Guarantee of no manual intervention in the synchronization process

- Advanced
30000–45000 UAH
Comprehensive solution with monitoring, optimization, and support for data integrity.
- All advantages of the Standard package, including mapping and webhooks
- Creation of a monitoring system and notifications for synchronization errors
- Optimization of data transfer speed between SQL databases and CRM
- Documentation of the synchronization architecture for future scaling
- One month of technical support and correction of mapping logic Expand

Budget: 27000 UAH Deadline: 14 days

I noticed the problem: a partial discrepancy due to further changes in one source and different names/identifiers. I can quickly conduct an audit of the logs and the synchronization mechanism, identify areas where updates are lost, and build a stable mapping of identifiers + a reconciliation script for already desynchronized records. An important technical nuance is that a reliable external_id or mapping table and correct timestamps/versions of changes are needed for incremental updates. Is there access to the change logs and the APIs of both sources (documentation/keys)?