Senior Scientific Software Engineer (Fed Gov)

RESPEC is seeking a Senior Scientific Software Engineer to support scientific computing work for a large National Laboratory. You’ll help sustain and modernize computational modeling software used in a high-consequence environment, with a focus on reliable, maintainable code and performance on Linux and HPC systems.

About RE/SPEC Inc.

• RESPEC is 100% employee-owned , which means we take ownership of every challenge.
• Here, your ideas drive real solutions.
• Since 1969, we’ve tackled complex challenges in energy transition, infrastructure resilience, digital transformation, and sustainability.
• We bring deep technical knowledge, real-world experience, and a commitment to work that matters.
• If you're looking for a place where your contributions have real impact, you’ll fit right in.

Responsibilities

• Sustain, analyze, and modernize scientific software, including legacy systems.
• Refactor code to improve portability, efficiency, maintainability, and stability.
• Support computational modeling across conceptual, process, and numerical models.
• Debug, profile, benchmark, and assess software performance and scalability.
• Support Linux development, HPC workflows, and job-scheduler use.
• Apply software quality practices, testing, and verification and validation.
• Document source code, technical debt, risks, and software workflows.
• Support reproducible builds, scientific data workflows, and migration readiness.
• Perform work in accordance with applicable Nuclear Quality Assurance (NQA-1) requirements.

Requirements

• Technical Experience Master’s degree in computer science, engineering, or a related discipline, such as environmental science, mathematics, or physics, and at least 5 years of relevant experience in computational modeling, software development, and documentation; or Bachelor’s degree in a related discipline and at least 10 years of relevant experience.
• Recent project experience At least one project within the 5 years preceding the response deadline involving both computational modeling and software development in a regulated, safety-critical, high-consequence, or equivalent mission-critical environment.
• Ability to describe the project’s environment, tasks, responsibilities, and deliverables, and explain why the work was high-consequence or mission-critical.
• Scientific programming with Fortran, Python, and C and/or C++ .
• GNU/Linux or equivalent development environments, including build, compilation, and debugging toolchains.
• HPC systems and job schedulers such as Slurm or equivalent.
• Bash or equivalent Unix/Linux shell scripting.
• Software quality practices, testing, and scientific data formats and workflows.
• Debugging, profiling, performance analysis, and legacy-code modernization.
• Git or equivalent version control and reproducible builds.
• Source-code documentation tools such as Doxygen or equivalent.
• Python 2 and Python 3 C and C++ OpenMPI, MPICH, or Intel MPI Serial and parallel scientific codes
• If you’re someone who sees problems as opportunities, you’ll thrive here.
• At RESPEC, you’ll work alongside clients to take on critical problems .
• Depending on your expertise, you might design infrastructure in remote locations, develop renewable energy solutions for global projects, or apply data-driven technology to improve mining and water systems.

Benefits

• Featured benefits: Flexible Work Schedules Paid Parental Leave 401(k) & ESOP (with company match up to 4%) Professional Development and Training Tuition Reimbursement Employee Assistance Program Medical/Dental/Vision Insurance Plans All your information will be kept confidential according to EEO guidelines.
• Big challenges need bold thinkers.

We do not accept unsolicited resumes from third-party recruiters.