Senior Software Engineer

• Shape the technical direction of the products and platforms we own across near-term and long-term planning horizons
• Scope major technical work, including estimating effort, identifying risks, and defining the delivery approach
• Design and build new applications and major enhancements in partnership with Product Management and architects
• Serve as the technical authority for our application or architecture area and be 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 we set in our own work
• Stay current on tools, practices, and technologies relevant to our area, and drive adoption where they improve the product
• Own security for our area by setting coding standards, catching vulnerabilities in design and code reviews, and driving fixes to completion

Technologies:

• AI
• Angular
• C#
• Cloud
• F#
• Java
• Python
• React
• Security
• TypeScript
• ASP.NET
• NodeJS
• AWS
• Ansible
• Azure
• CI/CD
• Docker
• Eclipse
• Fortran
• Helm
• JUnit
• JavaScript
• Kubernetes
• LLM
• Machine Learning
• MongoDB
• NoSQL
• Oracle
• PostgreSQL
• Product Manager
• SQL
• Terraform
• Web

• Bachelors 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 strong enough to explain technical trade-offs to both product managers and junior engineers with equal clarity
• Minimum qualifications may be acquired through technical schools or equivalent related experience
• Candidates having qualifications that exceed the minimum job requirements will be considered for higher level roles based on experience, additional job requirements, and business needs

We are Landmark, a Halliburton company, and we build 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, delivered as cloud-native SaaS platforms and enterprise on-premises solutions. We offer roles across multiple teams and technology stacks, including geoscience, drilling engineering, reservoir engineering, production engineering, E&P data management, cloud and platform infrastructure, data services, developer tooling, and AI-assisted analytics. We build small, high-ownership teams, offer competitive compensation including bonus and long-term incentive programs, a strong career path, and a role where our technical judgment shapes what gets built. The position is located in Milton Park, Abingdon, Oxfordshire, United Kingdom.