Reactor Software Engineer I-II

Reactor Software Engineer

Antares is seeking a Reactor Software Engineer to build the software that operates, tests, and interfaces with our first-of-a-kind microreactor and its hardware-in-the-loop environments. This software sits between reactor controls, instrumentation, operator tools, simulations, and external data systems, collecting live signals, streaming telemetry, executing commands, and helping the system respond predictably to off-nominal conditions.

You will work across a codebase where the same controls and interfaces can run in simulation, on a bench or hardware test stand, and eventually against full-scale reactor hardware. In this role, you will help define data is acquired, validated, routed, displayed, and recorded. You will contribute to how commands are scheduled, gated, confirmed, and executed; and how faults are detected, surfaced, contained, and recovered from.

You will partner with controls, electrical, embedded systems, safety, and test teams to design, implement, and validate hardware-facing software for sensors, data acquisition systems, custom electronics, operator displays, simulations, and HIL/HITL environments. Your work will be central to ensuring the reactor can be safely operated, tested, diagnosed, and eventually deployed.

Key Responsibilities

• Develop reactor software for data acquisition, telemetry processing, command handling, state management, fault response, operator interaction, and automated test environments.
• Own features end-to-end, from test specs and interface definitions through implementation, code review, integration, and documentation.
• Build software that can drive both real instruments and in-memory simulations, keeping controls and interfaces consistent across simulation, bench, HIL/HITL, and reactor environments.
• Implement runtime control features such as timeline scheduling, event/gate handling, mode transitions, command validation, command feedback, and telemetry streaming.
• Create and maintain clear software interfaces for hardware adapters, telemetry sinks, DAQs, sensors, controllers, operator tools, and external data systems.
• Implement data validation and quality logic so telemetry can be marked as valid, invalid, stale, unavailable, suspect, or otherwise actionable by downstream software and operator tools.
• Develop fault-aware software behavior, including detection, classification, containment, recovery, reset behavior, diagnostics, logging, and observability.
• Write automated tests that validate real system behavior, including hardware-facing workflows whenever practical.
• Support simulation, HIL/HITL, hardware bring-up, integrated reactor testing, and debugging across software/hardware boundaries.
• Collaborate with electrical, embedded, controls, software, test, and systems teams to define interface control documents, communication schemas, data dictionaries, and integration test plans.
• Participate in design reviews, code reviews, test readiness reviews, and root-cause investigations during hardware integration and deployment campaigns.

Basic Qualifications

• Bachelor's degree in Computer Science, Computer Engineering, Electrical Engineering, Software Engineering, or a related technical field.
• Experience developing clean, maintainable production or project software for hardware-integrated, distributed, embedded, robotics, aerospace, automotive, industrial, or mission-critical systems.
• Software Engineer I: 0-2 years experience
• Software Engineer II: 2-5 years experience.
• Strong Python 3 fundamentals, including typed code, data classes or equivalent structured data models, exceptions, testing, and idiomatic code organization.
• Working knowledge of data structures, object-oriented design fundamentals, and software interfaces that are readable, testable, and maintainable.
• Familiarity with concurrent, asynchronous, or multi-process software patterns, such as asyncio, threads, multiprocessing, event loops, IPC, networking, or message passing.
• Experience integrating software with sensors, controllers, DAQs, instruments, power supplies, embedded systems, simulations, or other hardware-facing interfaces.
• Ability to design clear data models, state machines, command flows,…