Of course! 
Here are the notes I took while getting it up and working (note: this is for the ‘backend’ only - I haven’t had the time to start looking at the front end yet):
Vikunja installation (FreeNAS):
Jail Setup:
Create jail named vikunja
Set jail properties to ‘auto start’
Mount storage (/mnt to jailData/vikunja)
Start jail & SSH into it
Installing packages:
pkg update && pkg upgrade -y
pkg install nano git go gmake
Clone vikunja repo:
mkdir /mnt/GO/code.vikunja.io
cd /mnt/GO/code.vikunja.io
git clone https://code.vikunja.io/api
cd /mnt/GO/code.vikunja.io/api
Compile binaries:
go install
gmake generate
gmake build
Create folder to install backend server into:
mkdir /mnt/backend
cp /mnt/GO/code.vikunja.io/api/vikunja /mnt/backend/vikunja
cd /mnt/backend
chmod +x /mnt/backend/vikunja
Set vikunja to boot on startup:
nano /etc/rc.d/vikunja
Then paste into the file:
#!/bin/sh
. /etc/rc.subr
name=vikunja
rcvar=vikunja_enable
command="/mnt/backend/${name}"
load_rc_config $name
run_rc_command "$1"
Save and exit. Then execute:
chmod +x /etc/rc.d/vikunja
nano /etc/rc.conf
Then add line to bottom of file:
vikunja_enable="YES"
test vikunja now works by:
service vikunja start
Set static IP on router
Backend available through IP:
192.168.1.XXX:3456
Done!
I hope this will be useful for someone in the future