.net Software Developer Ground Control System (GCS)

Randstad Digital is specialized in the recruitment of middle and senior positions for the Digital Market.Our client is the leading , defence, and security sectors on a global scale and he is looking for a .net Software Developer – Ground Control System (GCS) for Caldas da Rainha/Lisbon.We are looking for a highly skilled .net Software Developer to help design, build, and evolve Ground Control System — the core software that plans, monitors, and controls our unmanned aircraft missions.In this role, you will contribute across different GCS initiatives depending on business needs, from real-time flight systems to mission tooling, payload control, comms/messaging, and operator workflows.

You will also play a key role in our transition towards an agentic development approach, enabling more autonomy, automation, and AI-assisted engineering across the team.This role is ideal for someone who thrives in complex technical environments, values high ownership, and wants to help shape the future of a mission-critical product used globally. 1.

Technical Ownership & DeliveryDesign, build, and maintain backend components of the Ground Control System using C#/.NET.Implement robust real-time systems that manage telemetry, mission planning, payload operations, and operator workflows.Improve performance, reliability, and scalability across different modules of the GCS codebase.Contribute to modernizing architecture, tools, and engineering practices as the system evolves.2.

Architecture & System DesignDesign APIs, messaging flows, asynchronous pipelines, and multi-threaded components for high-reliability environments.Contribute to architectural decisions around modularity, data flows, error-handling, and system decomposition.Work with classification systems, message processors, payload interfaces, and complex stateful components.Help shape architectural direction in collaboration with software architects and product owners.3.

Agentic Development & AutomationAs part of the agentic engineering roadmap, you will:Use AI/LLM-based tools to accelerate development, refactoring, documentation, and testing.Support the design of internal us agents that assist with coding, validation, CI/CD, and documentation.Promote automation and tooling that reduces manual effort and increases engineering leverage.Help define safe, reviewable, and high-quality AI-assisted workflows for the team.4.

Quality, Reliability & OperationsEnsure high-quality code through strong testing strategies, clean patterns, and consistent documentation.Analyse complex performance and concurrency issues, especially in real-time data environments.Improve system observability through structured logging, instrumentation, and monitoring.Collaborate with DevOps and QA to ensure smooth delivery pipelines and reproducible builds.

Experience2+ years of professional software development experience.Background in C# and .NET (Framework and/or .NET 6+).Experience building real-time, high-availability, or mission-critical systems.Experience with large desktop or client applications (WPF experience is a plus).Technical SkillsProficiency in C#, async programming, multi-threading, and memory management.Experience designing APIs, distributed systems, or event-driven workflows.Familiarity with: Messaging systems (RabbitMQ, Kafka, etc.); Docker / containerisation; CI/CD tooling (GitLab, GitHub, Jenkins, etc.); Observability stacks (ELK, Graylog, Prometheus, Grafana); Data streaming or real-time telemetryExperience with WPF/MVVM or desktop application architecture is an advantage.Mindset & Soft SkillsStrong sense of ownership and engineering autonomy.Ability to navigate ambiguity and contribute to architectural decisions.Excellent debugging, problem-solving, and system-design thinking.Strong communication skills and collaborative mindset.Enthusiasm for automation, AI-assisted development, and continuous improvement.