The Senior Reservoir Simulation Scientist will work as part of CMG’s Co Flow development team. Co Flow combines reservoir and production engineering simulation technologies to improve the overall productivity of engineering workflows for large, integrated assets. It enables oil and gas companies to better understand and develop petroleum resources through a unified approach.
The successful candidate will join a small development team responsible for the technologies supporting Co Flow’s well and production engineering capabilities.
Working as part of the Co Flow team and under the direction of the Development Team Lead, the employee will work within a small team of engineering software professionals. The team is responsible for the design, development, and maintenance of innovative technologies for simulating reservoirs, wells, and surface networks.
A primary responsibility of this position will be to maintain and extend Co Flow’s fluid modeling capabilities, including, but not limited to, black-oil, K-value, and equation of state fluid models; fluid blending strategies; flash calculations; fluid component lumping/de-lumping; and temperature and enthalpy formulations for thermal applications.
Additional responsibilities include: Contribute to improving the team’s software development processes.
Work collaboratively with other Co Flow team members.
Understand the needs of reservoir and production engineers who use Co Flow.
Help develop clear specifications for new software features, including acceptance tests and release criteria.
Contribute to the design, implementation, testing, and maintenance of high-quality engineering software.
Note: This description reflects the general nature of the role.



It’s not a complete list of responsibilities—we believe in flexibility, initiative, and growing together.
Knowledge and Skills A minimum of 10 years of relevant professional experience developing engineering software, preferably involving thermodynamics, fluid modeling, reservoir engineering, or production engineering.
Proficiency in C++, Fortran, and/or C#, with the ability to work according to modern software engineering practices used within the project.
Strong teamwork and communication skills, with a willingness to learn and collaborate with others.
Experience with Agile software development methodologies and Test-Driven Development (TDD) is an asset.
Experience using AI-assisted software development tools, such as Claude or similar tools, is an asset.
Self-motivated and team-oriented, with a positive attitude and strong time-management skills.
Very good written and verbal communication skills in English.
Education A Master’s degree or higher in Petroleum Engineering, Chemical Engineering, or a related discipline, or an equivalent combination of education and relevant experience.
Experience Programming experience with C#, Fortran, and/or C++ is required.
Experience developing engineering software in a commercial environment.
Experience with commercial oil and gas engineering software is highly desirable.
Location This role can be based in one of the two company locations: Calgary, AB, Canada or Rio De Janeiro, Brazil
CMG Compensation and Benefits Overview – Canada CMG’s total rewards program includes: A performance-based bonus program
Learning and development opportunities
RRSP contributions
Top of the line medical and dental perks including a health spending

📌 Senior reservoir simulation scientist (Calgary)
🏢 Computer Modelling Group
📍 Calgary