CiviCRM for nonprofits - Johannes Filter

I help nonprofits and NGOs set up, extend, stabilize, and maintain CiviCRM - the open-source CRM for contacts, memberships, donations, newsletters, and event workflows. I’ve worked with CiviCRM on organisations ranging from tiny volunteer-run groups to national advocacy networks.

I’ll tell you honestly if CiviCRM isn’t the right fit. Bad-fit projects help no one.

If what you actually need is a custom app, public-facing platform, or data product rather than a CRM, see my full-stack development offering.

What I offer

Setup, upgrades & stabilization

Fresh installs on Drupal or standalone
Hosting setup, backups, and rollback-safe upgrade strategy
Configuration for the kind of work you actually do - not a generic template
Audits and cleanup when an existing setup is slow, brittle, or confusing

Extensions & workflows

Custom extension development (PHP / PHP Civix)
Donation, membership, event, and newsletter workflows
Newsletter signup with double opt-in on any website — see my guide
Payment-provider hookups, webhooks, REST API, and custom FormProcessor flows

Migration & data cleanup

Migrations from legacy CRMs, Airtable, Excel sprawl, old CiviCRM versions
Import pipelines, de-duplication rules, and contact cleanup
Historical-data cleanup with reversible scripts
GDPR-compliant data handling

How I work

Start with a free 20-min intro call — you tell me about your org, your timeline, and your current CiviCRM setup, then we decide if it’s a fit.
Fixed-scope or retainer engagements, typically 2-12 weeks.
Open source wherever possible. Your data stays yours.
If you already have a CiviCRM partner or in-house person, I can work alongside them on a specific piece.

Technologies

CiviCRM CiviMail CiviContribute CiviMember CiviEvent FormProcessor Civix REST API Webhooks Drupal Standalone MySQL / MariaDB Docker PHP JavaScript