Hi, I am a Senior Network Engineer at one of the biggest ISP's in Moldova. I have about 8 years of experience in networking, and especially I have experience with Cisco and Juniper routers and switches. Our ISP Network is build only on Cisco and Juniper devices(MX series routers,EX series switches and SRX firewalls), and I am responsible for design, configuring, maintenance and development of our network, so every day I deal with configuring of Juniper routers and switches.
Also, I am JNCIA-Junos and JNICS-SP Routing & Switching certified engineer + I am network Instructor at local Networking Academy, called iNet Academy Moldova where I teach JNCIA-Junos, JNICS-SP Routing & Switching, CCNA Routing & Switching and CCNP Routing & Swtiching courses.
Given to my experience in networking, and experience with Juniper devices, I think that I can easily help you with HLD since I deal with this day by day. Also, you could check my profile and see that I have already done some jobs with Juniper routers and switches and with design as well.