WordPress Developer Needed (Experience with Memberpress and Nationbuilder is a plus)

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We are a lean team with scant technical expertise needing to build out a Wordpress ecosystem to manage several aspects of our business. For the past year, we've been experimenting with a system called Nationbuilder (we were really looking for a sort of 'one ring to rule them all' system that would do our CRM, sales and membership management, email, etc. etc. but it's not living up to its promise and we're planning a move back to Wordpress.)

Our WP site currently lives at Upgrade to see actual info
Our NationBuilder site is at Upgrade to see actual info

We'd like to hire a few candidates for a short exploratory engagement; reviewing our requirements (happy to schedule a chat to answer questions) and making recommendations on how to move forward. We want to know what plugins and/or external systems you recommend to meet our needs, what kind of integrations are available to link the systems we're looking at & how closely coupled they are, where we will need custom development to meet our needs, etc.

Here are some details about our current setup and our needs:

We have a paid membership program and need to:
1. have a membership signup function (see the "become a member" flow on our nationbuilder site), where users can create a profile and pay, with several different options for payment amounts, and two different membership types
2. allow members to log in to the site and access content behind a paywall
We currently use MemberPress; it's been okay, but small things like the password reset function have never worked properly.

We syndicate (mostly through iframes) our Global Events Calendar & our Impact Accelerators Map (Upgrade to see actual info)
1. Visitors (not just paying members) need to be able to contribute events to the Global Calendar
2. The filtering and searching is really important; it's been fine, but not great in Events Calendar Pro (plus the custom dev that's been added to that plugin)

We need:
- Events management (we do monthly calls for our members; want to be able to advertise them to the general public, collect RSVPs and ideally easily be able to email those who haven't responded to the email invite, and send reminders to those who have)
- Better, more elegant filtering and searching on the facilitation encyclopedia and best practice database
- A searchable/filterable membership directory we can put behind the paywall that includes a profile that our members can edit about themselves.
- A searchable/filterable speaker directory (also behind the paywall) but accessible to speakers who can log in to edit their own profiles

We're considering using:
- Mailchimp for all our email (even to smaller groups--we currently use it only for our newsletters. Would want it to integrate closely enough that, for example, RSVPs get added to a list automatically...
- Pipedrive for sales management and possibly CRM
- Asana for project management
- Slack for team communications (would be great if membership signups, etc. generated slack messages)
- Medium for blogging

We'd also love to find:
- a really well integrated podcast/audio blog platform