Senior Software Architect & Tech Lead (C++, C#, Python)

SYSTRA UK & Ireland; Greater London; Hybrid; GBP 90,000 - 120,000; Full time

Job summary

SYSTRA is seeking a Principal Consultant (Software Development) in London to design, build, and maintain Paramics Discovery using C++, C#, and Python, across the full software lifecycle. You will collaborate with cross-functional teams to deliver reliable, testable software while championing engineering best practices.

You will mentor less experienced developers, contribute to architectural decisions, and help optimise CI/CD pipelines.

Qualifications

• Proficient in C++. Strong command of modern C++ (C++14/17/20), including memory management and templates.
• Proficient in C#: .NET Core / .NET 6+, async programming and OOP design patterns.
• Proficient in Python: scripting, automation, data processing, or back-end service development.
• Software Engineering Fundamentals: algorithms, data structures, design patterns, and SOLID principles.
• Debugging & Testing: experience with unit testing frameworks and profiling complex systems.
• Version Control: Git-based workflows, branching strategies, pull requests, and code reviews.
• Communication: ability to explain technical decisions clearly to technical and non-technical stakeholders.
• Configuration and deployment of solutions.

Responsibilities

• Design, develop, and maintain SYSTRA's proprietary microsimulation software Paramics Discovery using C++, C#, and Python across the full software development lifecycle.
• Write clean, efficient, well-documented code with emphasis on testability and performance.
• Participate in architectural and design discussions, contributing proposals and trade-off analysis.
• Review code from peers and provide constructive feedback that raises the quality bar.
• Collaborate with DevOps colleagues to optimise CI/CD pipelines and ensure smooth deployments.
• Interact with SQL databases - writing, reviewing, and optimising queries and stored procedures.
• Mentor less experienced developers, supporting their technical growth and embedding best practices.
• Contribute to test strategies including unit, integration, and performance testing.
• Participate in agile ceremonies: sprint planning, stand-ups, retrospectives, and technical refinements.
• Demonstrate behaviours aligned with SYSTRA’s behavioural framework by fostering a culture of excellence, collaboration, respect, and empowerment.

Skills

C++

C#

Python

Software engineering fundamentals

Debugging & testing

Version control

Communication

Configuration & deployment

Tools

Git

Docker

Jenkins

GitLab CI

Azure DevOps

AWS

SQL

Job description

SYSTRA is seeking a Principal Consultant (Software Development) in London to design, build, and maintain Paramics Discovery using C++, C#, and Python, across the full software lifecycle. You will collaborate with cross-functional teams to deliver reliable, testable software while championing engineering best practices.

You will mentor less experienced developers, contribute to architectural decisions, and help optimise CI/CD pipelines.