Top Recommended MailChimp & WordPress Expert | Setup, Custom Templates, Automations, API Dev + More!


Irvine, CA


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We are dedicated to taking businesses to a higher level by providing outstanding Mailchimp & WordPress related services.

At AnnexCore, we create solutions for businesses of all sizes - whether you are a small business, a midsize business or an enterprise.

With years of experience in email marketing across various industries and markets, we have the expertise and knowledge to help build out your email marketing vision.

We continuously work with many organizations that trust us with their MailChimp needs such as Twitter, Royal Caribbean, Travelzoo, Landmark Worldwide, City of Palo Alto, Cameron Hughes Wine, and many more!

We’d be happy to help your business too, with all aspects of your email program.

  • Account Setup
  • API Development
  • Automation Setup
  • Campaign Management
  • Consulting
  • Custom Designed MailChimp Templates (100% MailChimp Compatible)
  • List Cleaning & Management
  • Salesforce Integration
  • Training
  • WordPress/WooCommerce Integration and Support

Rely on our experience and expertise to execute email marketing activities with focus and precision. Get your free quote now and let us know what you need.

Tell Us About Your Project

AnnexCore | A MailChimp & WordPress Development Agency
Phone: 949-954-5590 (Schedule a Call)
Address: 17870 Sky Park Circle, Suite 210, Irvine, California 92614

See some of custom designed templates below.
You can also see some examples on our website here.



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- 06/29/2017

Delivered as promised. Great work, thanks!


- 06/03/2017

Heral was fantastic to work with. Understood the issue and got on it quickly. Would definitely use again.


- 02/13/2016

Heral was great. The work was done super fast and communication was great. Highly recommend.


- 12/21/2015

AnnexCore was fast, responsive, and did great work. I was a little surprised by the rate I was quoted, but for fast, reliable, and knowledgeable service, I think in the end it was fair. I would use Annexcore again and would recommend them.


- 10/23/2015

Heral was great to work with. The end result is a template that is super easy to use and modify about 100 ways. Well worth the money and we will work with them again when a need arises.

Thanks, Heral!


- 10/15/2015

AnnexCore did a nice job turning my newsletter concept into a sharp looking MailChimp HTML template. They even managed to use an out of the ordinary font that I wanted. Heral was good to work with and answered all of my many questions. I plan to use them again for other design work as it comes up.


- 10/07/2015

My experience could not have been better. I explained to Heral what I wanted and he delivered it EXACTLY to my specifications within a couple hours. He is amazingly responsive and replies to your inquiries and emails within minutes. The quality of his work surpassed my expectations. After a bunch of very poor experiences with other designers, Heral redeemed my faith in outsourcing tech projects. He will be my first call in the future as need arises.


- 08/07/2015

Heral did a fantastic job designing our templates! He listened to what we wanted and delivered. Heral was also readily available when using the templates and adding the content. He provided guidance and was able to tweak the templates to work with our content. Everyone loves our new email campaigns, and we're getting lots of traction. Thanks Heral!


- 04/30/2015

Heral was a lifesaver. Very patient, professional and really helped us out in a pinch. Will definitely be working with him and Annexcore again in the near future.


- 02/11/2015

I am a commercial real estate broker and I hired AnnexCore to produce some great looking templates that were functional, adaptive, and easy to use for my assistants.

Whey delivered everything they promised. The work was done quickly and the quality was flawless. The templates look and work perfect. I would highly recommend Annexcore.


- 02/03/2015

We have been discussing a newsletter for some time but became a bit frustrated in trying to get a layout that suited our needs. The idea came to look for an expert to design a template for us and AnnexCore did an amazing job! The template looks great! They worked back and forth with us until we were completely happy with the design, the implementation was extremely easy and the service was super-prompt. If only all service-based business were as efficient! I would not hesitate at all in recommending this company. The fee has been the best money spent in a long while, and well worth it! Thank you!


- 01/30/2015

My experience working with AnnexCore was great. I needed a custom mailchimp template coded out, so I searched around for some quotes. Their quote was below almost all of the quotes that I received and I liked Heral's attitude and vibe on the phone so I went with AnnexCore. I dealt directly Heral Patel, and his customer service skills are superb. I had not used mailchimp in a while and he helped me out a great deal. Also, they finished the job in two days. I definitely recommend AnnexCore!


- 01/22/2015

Had a great experience with AnnexCore! Heral Patel was very responsive and kept me posted on the progress of our template design. They turned around our design quickly and we are very happy with our new template. Thanks for such a great experience!


- 11/21/2014

I came across Annexcore through Mailchimp. As we were new to email marketing, Heral listened to what we were looking for and explained the best way to go. After going back and forth on design they completed our template super quick. Heral was great to work with!


- 10/23/2014

Heral, what a help he has been! I'm quite impressed with his professionalism, efficiency and friendliness. You'll be in great hands with AnnexCore for all of your template design questions!


- 10/16/2014

Heral and the team at Annexcore have done a fantastic job at bringing our mailers to the next level. They are professional, prompt, and very knowledgeable. I could not speak more highly of them. Thanks Annexcore!


- 08/29/2014

Responsive, professional, easy to work with, great customer support. Great job! Highly recommended.


- 08/25/2014

AnnexCore was extremely helpful and efficient in creating us a functional, customizable template to use for our company's newsletter. Heral was extremely helpful, and was gracious with our lack of HTML and Coding knowledge. We highly recommend AnnexCore for any and all Mailchimp needs! A+


- 07/09/2014

AnnexCore was great. I just needed some advice at this time and Heral gave it to me. I'd screwed up and wrote down the wrong meeting time and he was very accommodating in changing to a different time. I really appreciated that. His advice was great and he gave me options and plenty to think about in how to solve some complicated issues. I can highly recommend working with AnnexCore.


- 06/15/2014

AnnexCore was fantastic! Heral Patel was attentive, available, and fast. They converted my email design into a remarkably complex table and got it back to me in one day. We'll be going live next Thursday. I am glad and grateful that I connected with them. And will do so again.


- 06/05/2014

We needed our company MailChimp templates converted to mobile-friendly versions and AnnexCore sure did deliver! The quote was very reasonable and the templates were delivered to us in 2 business days. We went through a few revisions, which were promptly and happily completed.

Great work, I would highly recommend this company! Thanks again


- 05/13/2014

Heral was a huge help to us. He was quick and very kind through the whole process. I hope I do not have anymore issues but if I do he will be the first that I call. Great job and service.


- 05/09/2014

I have had a regular ole' template with MailChimp for sometime, and I was looking to raise the bar with a custom Email Template. One that I could work with easily and efficiently. MailChimp listed AnnexCore as one of their many experts. After reviewing 2 other companies, I decided to move forward with Heral at Annexcore. He had the knowledge and know how to take it to the level I needed. My Template design was spot on! and they were fast. The service and follow up have been very good with Heral and I am now using him for other services for my on line Web Store. I would recommend Annexcore to other businesses as they are very professional and understand the needs of the online industry. I must mention that before I started my template with Heral, he suggested ways to grow my email list and within 1 1/2 months we have over 700 + new subscribers after he installed Justuno!

Happy Cusotmer

Wednesday Reynolds

- 04/18/2014

We are delighted by the deliverables provided by Heral Patel and his team at AnnexCore. We've shopped around extensively for support at the leading edge of responsive capabilities, and found the winning team at AnnexCore.

Timely, thorough, professional -- cannot recommend AnnexCore highly enough!


- 01/10/2014

Excellent service! These guys know what they are doing. They definitely helped me overcome the issues I was having! I'll be using them for other services as my start up grows.


- 01/03/2014

Heral and his team quickly delivered the custom MailChimp template just as we needed. Appreciate the excellent service, fast response time, and high quality of work. We'll be returning for future projects! Highly recommend!!


- 12/10/2013

Not only they set up my account for me they created an amazing template that matches my website. They also provided training on how to use everything. Highly recommend these guys! Great support.

Kevin Catlin

- 11/01/2013

Heral, nailed it. Solid work, done fast. Thank you

Warren Coulter / West Knoll Collection

- 10/18/2013

Really fast and responsive! Finished the custom template in just a few days and they did if effortlessly with very little problem.

Highly recommended!

Heral Patel coordinated the work and he was really great to work with.

Sara Gummere

- 10/03/2013

Thanks to Heral at Annexcore I had a professional template in a matter of days! Great experience, company, I highly recommend Annexcore for your Mail Chimp needs!!!


- 09/04/2013

These guys are the best! Extremely quick turn around time, they completed my custom template in 2 days! They also provided some great tips prior to creating my template which would have saved me some trouble down the road.

Highly recommend them!


- 07/30/2013

I've worked with AnnexCore for a few projects now and they have always managed to exceed my expectations. Recently I needed a MailChimp template that would look professional and speak to my target audience. Naturally, I chose AnnexCore for this because of their unwavering dedication to customer service and their savvy knowledge of what appeals to different demographics. They created exactly what I needed in a very short amount of time. They are professional, a pleasure to work with, their prices are fair and they are very responsive to making any necessary adjustments. Naturally, I will be using their services again in the near future!

Mike Newlon

- 05/28/2013

I wanted a MailChimp "Internet E-Mail Marketing" feature built into my web site and developed so I could communicate more actively with my past customers and web site Subscribers.

AnnexCore came up with a precise estimate (cost, scope of work, etc.) that Heral thought would meet my needs. A week or so later everything was up and running as discussed and now I'm communicating directly with my web site subscribers.

AnnexCore provided a great service at a reasonable cost and did so in a most professional manner. Can't beat that!

Mary Westheimer

- 04/05/2013

Working with AnnexCore was a pleasure on every level.

They charged a fair price to get our MailChimp template working properly and made a good suggestion that improved how it works.

They got the work done promptly, and even provided a helpful video on how to use it.

I'll use them again for MailChimp, and maybe our Web site now, too!


- 04/01/2013

Very satisfied with the work this company did for my company. Spoke to a gentleman by the name Heral Patel and he got the job done very fast and professionally. Exactly to my specs.

A few days later I realized we needed to make an adjustment, and upon contacting him, he immediately made the adjustment.

I will work with them again. Highly recommended.

Thank you, Frank


- 03/20/2013

These guys do outstanding work! I was given the task at my company to come up with a new template for our email campaigns. I reached out to AnnexCore and they were nothing but amazing from the moment I emailed them. I highly recommend these guys!


- 03/11/2013

Heral and his team worked closely with us to turn our in-house designer’s vision into an efficient, professional newsletter. Heral was always responsive and easy to work with, and we’re very pleased with the final product. We would certainly recommend using AnnexCore in the future.


- 01/16/2013

I feel very lucky to have found Heral and AnnexCore for our MailChimp support.

AnnexCore consistently exceeds our expectations when delivering a new email template. In addition, AnnexCore is very quick, very accurate and very fun to work with. And, their code is always compliant with local and browser-based clients.

We will continue to use AnnexCore for all of our email support that uses the Mailchimp system.

Plus, I will recommend and refer them to all of my colleagues.


- 12/18/2012

Heral at Annexcore is the best! He doesn't only respond quickly, he also does the work quickly with the highest of quality. I've hired Heral for several projects of mine, and he has always done a fantastic job.

Thanks to him, my mailchimp account was setup with no hassle and started receiving subscribers. I also send weekly digest to my subscribers. Heral also set that up for me and works marvelously.

I'm a very happy customer and will always use Annexcore for all my mailchimp and blogging needs.

Joel Mathers

- 11/12/2012

These guys definitely play a solid customer support game. They respond to all my requests within 15 minutes or less. Heral is a great resource for anything Mailchimp, he consulted me through all my tedious questions. I definitely recommend these guys if you're looking for someone good, and someone that actually cares!


- 11/02/2012

I needed a quick fix on my existing template I had. I contacted AnnexCore and not only did they answer my question within 10 minutes, but they sent me my template completely fixed in 30 minutes! I was very surprised as to how fast they fixed my template considering it took my a whole day!

Lisa Maass @ Buccella

- 10/30/2012

When I was introduced to Heral I had never organized any sort of email blast and he was so helpful--he never made me feel silly. He answered all of my questions and was ALWAYS available whenever I needed help. THANK YOU!!


- 09/18/2012

I searched and searched for a designer to create a mailchimp template for me and was unable to find one that can do the right job. I contacted annex core and they were able to provide me a concept within 1 day and it was absolutely perfect! I asked to change a few things around and they were more then happy to provide the changes until i was completely satisfied. I will definitely be using them again for my future template designs!

Anna Jennings

- 08/08/2012

I posted on Twitter that I was looking for someone that was an expert on Mail Chimp and Heral responded immediately that he could help. Boy did he help.. He took something I had put together and with a little more information from me & my website, he created this amazing looking template that matches my website and it looks great. It's very professional.
I will definitely have more work done with other templates and sign up forms in the near future.
I love my template, it's beautiful and exactly what I wanted. I will definitely be referring him to other business owners that would benefit from his amazing work.

Rockin Entrepreneurs

- 06/29/2012

Heral found my ad asking for help and he responded right away and was extremely helpful. Before even I had agreed to accept his help he had already done some research and offered a few solutions to the problem I was having with linking my mailchimp account to my subscribe form. I spent a whole evening trying to figure this out with a wordpress "expert" but he couldn't do it. Heral did it within an hour of granting him access to my account. I'm very please and will refer him anytime


- 05/18/2012

AnnexCore was a pleasure to work with. They were very professional with prompt communication. I contacted some other companies and I didn't receive a reply back for days. When I contacted AnnexCore, I received a reply back within 10 minutes! Customer service is the first thing I look at and AnnexCore surpassed that. I will definitely work with them again and highly recommend them to anyone! Their work ethics are great as well as their quality. I couldn't have been more happier with my custom template!

Wayne Fenstermacher

- 05/16/2012

I cast a wide net looking for someone to create a professional template for our new MailChimp account.

Boy - I'm so glad for the quick response by AnnexCore. Within a day, we had a template design nailed down and ready for coding.

Other firms told me it would take 3-4 weeks to get to where AnnexCore was in just 24 hours! And, they wanted so much more for taking so much longer, too!

I have hired dozens of contractors in the past 8 years and AnnexCore is among a small number we would re-hire in a heartbeat. In fact, we're going to LOOK for marketing tasks to continue to challenge AnnexCore - we're that impressed.


- 04/20/2012

When AnnexCore asked me for a review, I was excited to share my experience. Not only do they handle all my web needs and SEO, they've introduced me to the effectiveness of e-mail marketing. They handled everything from writing, design and strategy for the campaign, taking out all of the stress for me.

MailChimp Experts are independent third parties, who are in no way affiliated with or employed by MailChimp. We provide the Experts Directory for customer convenience only, and we don't endorse or guarantee the third parties' services, advice, or products.