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Internship Computer Science Startup Jobs in Toronto, ON

Rockstar

Software Engineer

Toronto, ON

... in computer science or a related field - 1-3 years of experience in full-stack development ... Startup mentality with a passion for rapid prototyping, testing, and iterating on feedback ...

Cmcmarkets

Quantitative Trader

Toronto, ON

Mathematics, Engineering, Physics, Computer Science). * Internship or early-career experience in the front office, ideally in equities, FX, derivatives, or related areas. * Strong quantitative and ...

Waabi

Research Scientist, Learnable Planner

Toronto, ON · On-site +1

CA$158K - CA$269K/yr

Qualifications: - MS/PhD degree in Computer Science, AI, Machine Learning, Computer Vision ... internships, work experience, research projects, and papers at top conferences. - Strong ...

Waabi

Research Scientist, Simulation Agents

Toronto, ON · On-site +1

CA$158K - CA$269K/yr

... Mentor junior scientists and interns; foster a culture of scientific rigor and rapid ... Qualifications: - Masters/PhD in machine learning, computer science, engineering, or a related ...

Jefferies

Compliance Analyst

Toronto, ON

Bachelor's degree in Finance, Economics, Business, Political Science, Law, Accounting, Computer Science, Data Analytics, or a related field. * Prior internship experience at an investment bank ...

CIBC US

AI Scientist

Toronto, ON · Hybrid

... ops, internships, research projects, thesis work, or side projects. You can demonstrate ... Computer Science, Engineering, Mathematics, Statistics, Economics, Natural Sciences, Psychology, or ...

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Internship Computer Science Startup information

What does an internship at a computer science startup involve?

An internship at a computer science startup typically involves working on real-world projects, collaborating with experienced engineers, and contributing to software development tasks. Interns may help with coding, debugging, testing, or developing new features, and are often exposed to various aspects of the business, such as product design and customer feedback. Startups usually offer a fast-paced, hands-on learning environment where interns can gain valuable technical and professional skills while making a meaningful impact.

What types of projects or tasks do computer science interns typically work on at startups?

Computer science interns at startups often work on a variety of hands-on projects, such as building new features, fixing bugs, or prototyping innovative ideas. Because startups tend to have smaller teams, interns may have the opportunity to contribute code directly to the product and collaborate closely with engineers, designers, and sometimes even founders. This environment fosters rapid learning and exposure to the full software development lifecycle. Interns may also participate in code reviews, daily standups, and brainstorming sessions, making their work both impactful and dynamic.

What is the difference between Internship Computer Science Startup vs Software Developer Intern?

AspectInternship Computer Science StartupSoftware Developer Intern
Required CredentialsEnrolled in CS or related degree, basic coding skillsEnrolled in CS or related degree, coding skills
Work EnvironmentFast-paced startup setting, collaborative teamsCorporate or startup, team-based projects
Employer & IndustryStartup companies in tech, innovation sectorsTech companies, software firms, startups
Search & Comparison IntentUnderstanding internship roles in startupsComparing internship roles in software development

Internship Computer Science Startup positions typically involve working in dynamic startup environments, focusing on innovative projects with a broad range of responsibilities. Software Developer Intern roles are more structured, often within established companies, emphasizing specific coding tasks. Both require similar educational backgrounds and skills, but the startup internship offers a more versatile experience in a fast-growing setting.

What are the key skills and qualifications needed to thrive as an intern at a computer science startup?

To thrive as an intern at a computer science startup, you need a solid understanding of programming fundamentals, problem-solving skills, and ideally, coursework or experience in areas like algorithms, data structures, or web development. Familiarity with version control systems (like Git), cloud platforms, and common programming languages such as Python or JavaScript is often required. Initiative, adaptability, and strong communication are crucial soft skills for collaborating in a fast-paced, innovative environment. These skills and qualities enable interns to contribute effectively, learn quickly, and grow within the dynamic culture of a startup.
Internship Computer Science Startup jobs near you
Infographic showing various Internship Computer Science Startup job openings in Toronto, ON as of August 2026, with employment types broken down into 50% Full Time, and 50% Part Time. Highlights an 75% In-person, and 25% Hybrid job distribution.

Software Engineer

Rockstar

Toronto, ON

Full-time

Retirement, PTO

Re-posted 3 days ago

Job description

Rockstar is recruiting for an early-stage, well-funded startup that is transforming how enterprise accounting teams manage the month-end close process. The founding team brings deep experience from both finance and engineering, having overseen finance organizations at leading tech companies and built month-end close systems at major enterprises. The company is backed by top-tier investors and finance leaders from some of the most innovative organizations in the industry.

About the Company

This early-stage startup is dedicated to helping enterprise accounting teams streamline the tedious process of month-end closing. The founders have experience from both sides of the problem: overseeing finance organizations at leading technology companies and building month-end close systems at major tech firms. The company has raised a record-setting seed round in the accounting space from top venture capital firms and is supported by finance leaders at prominent technology companies.

Role Overview

They are setting up a new Toronto engineering office and need a founding team
As a founding engineer, the selected candidate will be at the core of building the product from the ground up. This role offers the opportunity to shape both the front-end and back-end architecture, working closely with the founders and early customers to solve complex financial problems.

Key Responsibilities

- Lead full-stack development of key product features such as reconciliations, flux analysis, and accruals automation

- Build and maintain robust integrations with financial systems including ERPs, HRIS, procurement software, and CRMs

- Design and implement core components of the backend platform, including the jobs framework, flexible data ingestion, and complex financial modeling

- Ensure best practices in software development, including code quality, automated testing, and CI/CD

- Collaborate with the founding team on product strategy, feature prioritization, and customer feedback loops

- Build and maintain planning and agentic workflows using state-of-the-art large language models

- Collaborate on technical decisions regarding scalability and security

- Help build the engineering team and culture

Required Skills

- Bachelor's or master's degree in computer science or a related field

- 1-3 years of experience in full-stack development, preferably with early-stage startups

- Strong experience building financial systems is preferred

- Proficiency in front-end technologies such as React and NextJS

- Strong back-end development experience with Go or similar technologies

- Strong experience with relational databases and modeling

- Familiarity with cloud infrastructure (AWS, GCP)

- Ability to understand basic machine learning concepts and quickly ramp up

- Startup mentality with a passion for rapid prototyping, testing, and iterating on feedback

- Fintech or accounting software experience is a plus

Why Join

- Be a core part of a mission-driven startup looking to transform accounting processes

- Work in a fast-paced environment where decisions directly impact product direction and company growth

- Opportunity to grow with the company and build a technical team from the ground up

- Competitive salary, equity, and benefits (401k, unlimited PTO)

Join in revolutionizing the accounting month-end close and making accounting operations more efficient for businesses everywhere!

Apply