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I will build a python API integration to sync mailchimp and your CRM
Carter DuBois
About this gig
Your CRM, Mailchimp and your SMS tool each hold their own version of the same people. I build the Python API integration that makes them agree, and I make the writes safe.
The pattern runs in production for a database of 700K+ contacts synced with Mailchimp, an SMS platform and a hiring platform (ATS) every 15 minutes. It exists because a single REPLACE-style API call once erased fields on 5,000 contacts. Every write now reads the live record, merges only what changed, writes the full record back, reads again to verify, and logs before and after. A write that cannot be verified is refused.
What you send
- Which systems, which direction, and which fields are the source of truth
- API access for each platform (I'll list the exact scopes)
- How often it should run
What you get
- A Python sync with the safe-write pattern, source in your repo
- Unsubscribes and opt-outs flowing back so one opt-out closes every channel
- A run log per row, a summary report per run, alerts on failure
- Deployment on your server or cloud instance
Ground rules: no writes to a live audience before a dry run you approve. Message me the systems involved first; scope is confirmed before you order.
Get to know Carter DuBois
Carter DuBois
Junior Data Architect
- FromUnited States
- Member sinceSep 2026
- Avg. response time3 hours
Languages
English, Spanish
Mention a first customer bonus and get substantial discounts on your project!
I turn messy data into systems that run themselves. 7+ years in healthcare, aviation, and retail: PostgreSQL databases holding millions of records, Python ETL pipelines that clean, deduplicate, and sync data across platforms daily with no hands on it, and reports that give leaders answers instead of spreadsheets. I build database schemas, automation, API integrations (CRMs, Mailchimp, SMS), and dashboards your team can actually maintain.
Tell me the problem and I'll map the fix before you commit.
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FAQ
Can this delete or overwrite my data?
Not by design. Every write reads the live record first, changes only the intended fields, writes the whole record back and verifies it. A mismatch is refused and logged. Nothing is deleted unless you ask for a deletion rule in writing.
Which platforms do you support?
Mailchimp, HubSpot, Salesforce, Heymarket, Twilio, Bullhorn, Airtable, Google Sheets, PostgreSQL, MySQL, and any REST API with documentation. Tell me yours before ordering; unusual ones may need a custom offer.
Do you need my API keys?
Yes, with the narrowest scopes that work. I list them before you share anything, you can rotate them the day I hand over, and the code reads them from environment variables, never from source.
Where does it run?
On your server (Docker plus a scheduled timer), on a small cloud instance I set up for you, or on your machine for one-off runs. Standard and Premium include deployment.
What happens when a sync fails?
The run stops at the failing row, logs why, alerts you, and the next run picks up where it left off. Nothing half-written: each row is verified before the next one starts.
