Hello! Aside from the typical website platforms, I would recommend using Twitter's hashtags and user handles. Try following and using the ones that your potential prospect or otherwise ideal partners would be following and start sharing about your work, your progress, and outreach for a potential partner. If possible try to be local when doing so.
But obviously, some to use include Startups.co, Basecamp, Inc 500, yesPHX, BetaBulls, MPV, Lean Startup, Lean Methodologies, TechCrunch, etc.

Attend groups where talks are given about your topic.

By groups I mean where real humans show up in the flesh.

Meetups + Conferences + CoWork Offices.

Attend + network. Remember, most important person in the room is the event organizer. Meet them. Get to know them over time. Then either they'll ask you to speak or you can pitch yourself to speak.

Once you start speaking at events, you'll have to take a big stick with you... to beat off all the people pitching you to be your business partners.

It comes down to the SKA’s and the PIP’s. My HR professor at UMass, Dr. Fernsten, instilled this in us from day one. You should hire people based on PIP’s, not SKA’s, if you feel they can do the job with proper training.

What are PIP’s? They are Personality, Interests and Preferences. These are the natural fiber of someone, and are often less malleable than SKA’s – Skills, Knowledge and Abilities. Hiring people to fit your organization, who love your organization, and have the personality and interest to join that organization is so important; if they have the right character, you can often train them to do ANYTHING.

I recall a position I took back in 2005 working for a consulting company. The initial call was for someone to fix and maintain their computers and to update their website. At the time, I had little or no experience with websites, but I had good business sense, was getting my MBA, and wanted to work for this company. They brought me in for my PIP’s, not by SKA’s. I still work for them, and one of the comments from them was that I really didn’t know a lot about websites when I started with them, but I demonstrated interest, and they found me to be trustworthy and had the right personality for the work.

If you're looking to find a business partner I would recommend even before starting your search to think about and analyze why you are interested in bringing on a partner. Are you looking to find a complimentary skillset? or are you bringing someone on to take work off your hands?

Understanding what you are looking for and who you hope to meet is the first step in a successful partnership arrangement.

Once you've decided on what you are looking for it's time to be aggressive. In a recent search for a technical co-founder, my partner and I effectively created a sales pipeline filled with potential candidates. We did a majority of our work looking online finding potential partners on Angel List, Built in and Co-Founders Lab and complimented that with attending meet-ups and other in-person events. We developed a list of about 40 potential technical partners and reached out to them 1 by 1 tracking our outreach. A majority of those we reached out to turned us down, that was the bad news. The good news was because we reached out to 40! people even though a majority turned us down we still had a large enough pool that we could find the person we thought would work best with our team.

Side Note- Once you have reached out to potential partners who are interested in working on your project, your job isn't done. You need to get them to understand your business and get them to buy in before you can move forward.

To summarize Understand your motives, cast a wide net, be aggressive and sell sell sell!

There are a couple of options. These options are visiting meetups, startup events, using your network and finding them online. I will give you a quick list of sites that you can use to find your business partner.

Founder2be - Founder2be is a website that allows both startups and individuals to find one another. Hence, it allows their users to find co-founders. Users can specify the country and position they are looking for. Then, they can scroll through individuals that match that criteria.

Founders Nation - Very similar to Founder2be, this site allows users to look for people that are interested in joining startups. Each person has a profile that states their skills, what they are looking for/what they want to do, their stage, contact details, location and much more.

Work in Startups - A job board listing for startups and startup jobs. There is a whole section for startups looking for co-founders. The main focus of the site is for people looking to join businesses. Hence, it would be a good idea to advertise the position on this site.

Angel List - Similar to Work In Startups, Angel list allows their users to list their company and then advertise hiring positions. Furthermore, Angel List can be useful if you are ever interested in looking for investors. The main focus of this site is to get people that have the same passion for startups together.
Like I said earlier, don’t forget to visit meetups and startup events as well. The face to face contact can be extremely useful for finding your business partner!

I hope this helps!

First congratulations on motivating on something. Second, you need to really know what you want out of your partner first before you look for one.

For instance :

- looking for a monetary injection

- a skill set with sweat equity

- both

- do you have a plan of what your "partner" will redeem from your business?

Once you establish this, then you can search for a partner with the appropriate tools.

Everything else is a shot in the dark.

You can find a business partner in the following persons:
1. Former co-workers: Still in touch with co-workers from your 9 to 5 days? Former co-workers are an ideal place where to find a business partner. Because you already know their work first-hand, there is less risk that the partnership will go belly-up. You will know beforehand if personality conflicts or unforeseen bad habits on their part will create problems. The key to a successful partner search is to mentally separate out past co-workers whom you know to have experience, skill, and drive from those who were inexperienced or demonstrated poor work or personal ethics in the past. Then, choose an individual who is compatible with your personality-wise and approach her to see if she is interested in leaving traditional employment for a career in entrepreneurship and has a similar business vision.
2. Business brokers: Business brokers help people buy and sell privately held businesses. Simply, because they are frequently in touch with entrepreneurs who are transitioning out of one venture and into another, they can put you in touch with another person in your area. Ideally, a contact who is seeking to buy a new small business as a co-owner. Then you can go in on the purchase of a business together and potentially run it together as partners. Retaining the services of a business broker can be costly. But their knowledge about business sales and their skill in negotiating business deals can prove valuable if have the funds and are serious about setting up the terms needed for successful business co-ownership. If you go this route, be sure to work with licensed and reputable business brokers.
3. Partner matching websites: If you live in a small or remote city without much business activity, your existing connections might be unable to offer much help with where to find a business partner. If this is the case, consider casting a wider net by searching for a business partner on the web. Partner-matching platforms such as FounderDating.com or CoFoundersLab.com allow you to input your location and business interests and pick from a nationwide list of co-founders or business partners in your area and niche. Do not put the partnership on paper before meeting your prospective partner in person. Certain qualities do not translate well over the web. You need to be sure that your personalities and motivations gel before making it official.
4. Former clients: It is typically unwise to try to lure a current client or one of his employees away from that business to join yours; this can be perceived as poaching and jeopardize your own relationship with the client. However, former clients are fair game to approach for a potential business partnership, provided that the client relationship ended on a positive note. One thing to keep in mind in this scenario is that if your business directly competes with the business at which your former client works. She may have signed a non-compete agreement with his employer that may keep her from working at your business.
5. Family or friends: A happy marriage does not always equate to a happy business marriage. Which is why some entrepreneurs avoid forming business partnerships with their spouses, siblings, or friends as a rule. But if your work styles are in sync, and the idea of regularly seeing your business partner both on and off work does not put you off the partnership, friends or family members can make for trustworthy partners. Make sure to establish clear expectations about the role each of you will play in the business from day one. Likewise, put an exit plan in place so that you do not jeopardize the personal relationship if the business partnership should fizzle out.
Besides if you do have any questions give me a call: https://clarity.fm/joy-brotonath

I guess you have gotten a partner for your start-up by now and you have learnt all the lessons that comes with the strategy you adopted.

The question for me should have been, how do I get the "right partner" for my start-up.

The right partner for me is one who shares similar vision and values with you. This reduce misunderstandings and potential conflicts by over 70% because vision and passion is what makes us work with blood, sweat, and tears whether or not we are getting a reward.

You may not have that kind of person within your network. I will alwats recommend walking up to someone who you know fit your need, or try network events, or share your passion online, you will be surprised the call that may come in.