Senior Software Engineer - Landmark (Calgary, AB, CA, T2P 3V4)

We are looking for the right people — people who want to innovate, achieve, grow and lead. We attract and retain the best talent by investing in our employees and empowering them to develop themselves and their careers. Experience the challenges, rewards and opportunity of working for one of the world’s largest providers of products and services to the global energy industry. About Landmark Landmark, a Halliburton company, builds the software and data platforms that help the global energy industry make better decisions. Our products span subsurface interpretation, well construction planning, reservoir simulation, production optimization, and digital operations. These are tools used daily by engineers and scientists at the world’s largest energy companies and run as cloud-native SaaS platforms and as enterprise on-premises solutions. About the Role You are a technical authority who shapes what gets built and how. At Landmark, that means owning the technical direction for products that oil and gas operators use for high-stakes engineering decisions. You work under broad direction, make architecture decisions that hold up over time, and raise the quality and capability of the teams around you. You work closely with Product Management and architects on new application design and major enhancements, and you serve as the first technical escalation point when something hard needs to be sorted out in your area. The decisions you make end up in production code that matters. Strong software engineering fundamentals and the technical depth to independently own complex areas of a product are the primary requirements. Domain knowledge is valuable but not required at hire. Positions are available across a range of teams. Team assignment determines both the product domain you work in and the major technologies you use. Teams build software for domains such as: Geoscience — geology, geophysics, or petrophysics Drilling engineering and well planning Reservoir engineering and modeling Production engineering and optimization E&P data management and integration Cloud and platform infrastructure, data services, and developer tooling AI-assisted analytics, search, and generative AI Technologies used vary by team and include: Languages such as Java, C#, F#, C++, Python, TypeScript, and Fortran Frameworks, platforms, and runtimes such as .NET, Angular, React, and Node.js Cloud platforms including Azure and AWS Containerization and orchestration tooling such as Docker and Kubernetes Infrastructure automation tools such as Terraform, Ansible, Helm, and Argo CD/Flux Relational and NoSQL databases such as PostgreSQL, SQL Server, Oracle, and MongoDB Job Duties Shape the technical direction of the products and platforms you own across near-term and long-term planning horizons Scope major technical work: estimate effort, identify risks, and define the delivery approach Design and build new applications and major enhancements in partnership with Product Management and architects Serve as the technical authority for your area of the application or architecture: the person the team turns to when a decision is hard or a problem is deep Evaluate architecture and implementation for performance, scalability, and security weaknesses, and drive improvements through to resolution Lead design and code reviews with a focus on long-term quality, not just correctness Challenge the delivery process when it produces slow feedback, unnecessary risk, or poor outcomes Mentor engineers at junior and mid levels through code reviews, technical guidance, and the standard you set in your own work Stay current on tools, practices, and technologies relevant to your area, and drive adoption where they improve the product Own security for your area: set coding standards, catch vulnerabilities in design and code reviews, and drive fixes to completion Qualifications Required Bachelor’s degree in Computer Science, Software Engineering, or a related discipline, or equivalent experience 10 or more years of software development experience Deep proficiency in at least one of: Java, C#/F# (.NET), C++, Python, or TypeScript (React/Angular/Node.js), and a history of delivering production software in that stack Experience designing and owning the architecture of a complex software system or major subsystem, with technical decisions that held up across multiple releases A track record of providing technical leadership across a team or product area Communication skills sharp enough to explain a technical trade-off to a product manager and a design choice to a junior engineer with equal clarity Preferred Experience with cloud-native development, full-stack or web application development, or data platform technologies Experience with CI/CD pipelines, containerization, and infrastructure automation Background in technically complex or scientifically demanding application domains (distributed systems, scientific computing, real-time systems, large-scale data) Experience integrating