C#/C++ Software Engineer in QuantConnect

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QuantConnect is a radically open-source, algorithmic trading technology company building infrastructure to empower engineering and financial analysts around the world. We serve 200,000 engineers who use our platform to write trading algorithms and have traded more than $2B/mo in volume with our open-source algorithmic trading platform.
We host a web-based coding environment, to enabling the community to design and code their trading strategies in python or C#. We often have thousands of users simultaneously running intensive data processing.

Our radically open source project, LEAN, allows anyone to design algorithmic trading strategies. LEAN is the C# kernel of QuantConnect, processing billions in trading volumes and trillions of data points per day on our cloud cluster.

Job Functions

We're looking for brilliant, collaborative engineers to join the LEAN team, solving complex software engineering problems in the heart of LEAN.

We've been engineering since 2012 but each day we face more radical challenges with the rise of crypto trading and forever hungry demands of investors.

  • Design, implement, and maintain core LEAN open source project, along with LEAN CLI.
  • Working directly with the CTO to start, and as you grow will be given more project ownership.
  • Success is measured by the quality and quantity of problems solved.

Qualifications and Requirements

  • Computer Science / Software Engineering degree helps but if you're a savant we don't need a degree.
  • Comfort mentally loading large engineering models and understanding data flows, along with where to place the "fix".
  • Comfort coding; this role is a hands-on position solving active challenges.
  • Comfort with C# or C++.

Desirable Skills

LEAN challenges require a deep understanding of computer science and algorithmic problems. Each day we push the barriers of what is technically possible to gain performance improvements and restructure massive models to improve the system design.


  • A creative and challenging work environment where you're given a lot of control and discretion to execute the mission of the company. We believe in hiring a small number of brilliant people and then giving them the tools to get the job done.
  • We are a radically open-source company; contributing millions of lines of code each year. We harness and contribute to a dozen repositories around the world.
  • Our primary users are other brilliant quants and engineers; working with the community is a joy as you learn from the best in the world.
  • The basics; healthcare, dental, life insurance, 2W paid holiday each year.

Fully remote You can work from anywhere in the world.
Flexible hours Flexible schedule and freedom for attending family needs or personal errands.
Informal dress code No dress code is enforced.

Remote work policy

Fully remote

Candidates can reside anywhere in the world.

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