Business Development Intern (December '26 Grad)

Summer 2026 Sales Internship: Path to Full-Time Offer

OneThirtyFive | Downtown Cleveland, Ohio

In-Office | Summer Internship (May to August 2026)

Target: December 2026 Graduates

About OneThirtyFive

OneThirtyFive is at the forefront of startup growth, helping B2B companies accelerate customer acquisition through elite Business Development Representatives (BDRs) and AI-powered sales systems.

We partner with some of the fastest-growing startups in the country, including Pest Share, Shipday, and Within3, giving our team direct exposure to high-growth environments and real-world sales execution.

Our culture is built around performance, learning, and ownership. We move fast, expect a lot, and invest heavily in the people who prove they can deliver.

Internship Overview

We’re looking for high-performing, competitive students graduating in December 2026 to join us for a Summer 2026 Sales Internship.

This is not a typical internship, you’ll be doing the actual job.

You’ll be on the front lines of startup growth, running real outbound campaigns, speaking with real prospects, and learning how elite sales teams operate.

Top performers will receive a full-time offer to join OneThirtyFive after graduation. We had 2 December 2025 grads join us through the internship to hire program.

What You’ll Do

• Execute high-volume cold calling campaigns (this is ~90% of the role)
• Research and identify target prospects for high-growth startups
• Learn and apply outbound sales frameworks and messaging strategies
• Participate in daily sales training, call reviews, and strategy sessions
• Work directly with leadership on improving campaigns and performance
• Gain exposure to AI-driven sales tools and modern outbound systems
• Collaborate with a competitive, high-performance team in-office

Who This Is For

• Graduating December 2026
• Highly competitive and driven — you like to win
• Comfortable being on the phone and handling rejection
• Strong communicator (native English speaker)
• Willing to work in-office in downtown Cleveland daily
• Fast learner with a strong work ethic
• Interested in startups, sales, or building a career in business

What You’ll Gain

• Real sales experience (not busy work)
• Direct mentorship from experienced startup operators
• Exposure to multiple industries and high-growth companies
• Training in modern outbound + AI-assisted sales
• A clear path to a full-time BDR role post-graduation

Compensation & Perks

• Base pay + performance bonuses
• Company-wide profit sharing (for full-time conversion)
• Cleveland Guardians season tickets
• Annual January team trip (warm weather required)
• High-energy, in-office environment with a competitive team