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Legion Intelligence via Greenhouse

Senior Software Engineer - Machine Learning (Remote US)

United States $170k–200k/yr senior
still open verified 1d ago posted 65d ago seen 2h ago
Apply at job-boards.greenhouse.io

This is the employer's own posting, not a copy on a job board.

What we know

Is it still open?

Confirmed still open

Last checked 1d ago — checked against the employer's own applicant tracking system, which is the company answering directly.

We re-read the employer's own applicant tracking system and the posting was still there. That is the company answering directly.

Check this listing's status as JSON

How old is it?

Posted 65d ago

The date the source published, not the day we noticed it (2026-08-05). Last seen at its source 2h ago.

We have tracked this listing since 9 Oct 2026 (1 days). The employer's own board has carried it every time we have read it, most recently 2 hours ago.

Is it remote?

The listing says yes

The location field doesn't say remote, so our assessment is based on the title or the description. Read the listing before applying.

Who may apply?

United States

The description agrees: it names United States.

What the ad says
…must be domiciled in the U.S. (must live permanently and maintain home address in the US)*** ***As a step in the application process you will be required to provide legally authorized Identification t…
…must live permanently and maintain home address in the US)*** ***As a step in the application process you will be required to provide legally authorized Identification to show verification o…

Pay

$170k–200k/yr

Read out of the job description by us, not from a structured field. Shown in the posting's own currency and period; we never convert.

Skills named in the ad

A/B TestingKubernetesLLMMachine LearningObservabilityPythonRAGRustTroubleshooting

Recognised terms only, from a fixed vocabulary — this is what CV matching compares against.

Carried by 1 source

The listing

About Legion

Let’s be real, AI isn’t magic; Legion was built to move beyond AI hype—delivering secure, reliable systems that work alongside the people tackling the world’s most critical challenges.

Born from a Department of Defense partnership and trusted by leaders across government and enterprise, Legion embeds intelligence inside complex systems, unlocking data, accelerating human workflows, and strengthening mission-critical systems. We don’t replace workflows—we optimize them, ensuring quality, efficiency, and reliability inside the platforms our partners already use.

With world-class collaborators like Palantir, Nvidia, HPE, and Oracle, we’re building intelligent infrastructure that enhances human capability and drives impact at the edge and across a range of enterprises.

We’re looking for bold thinkers and doers to join us in shaping the future of AI that’s secure, grounded, and built to work.

Staff Applied Machine Learning Engineer (Remote USA)

***This role requires expert level in development and deployment of machine learning models***

***US Citizenship or Greencard (Permanent US Residency) is required due to US Government contract requirements***

***You must be domiciled in the U.S. (must live permanently and maintain home address in the US)***

***As a step in the application process you will be required to provide legally authorized Identification to show verification of eligibility through third party provider CLEAR ID***

Senior Software Engineer, Machine Learning

As a Senior Software Engineer, Machine Learning, you will design, build, and evolve the core AI capabilities that power intelligent experiences across our enterprise AI platform. You will integrate modern foundation models into production systems, develop reusable AI capabilities, and continuously improve their quality, reliability, and performance. Working closely with cross-functional teams, you will transform advances in AI into secure, scalable, and production-ready capabilities that accelerate innovation across the platform.

Responsibilities

  • Design, build, and maintain the core AI capabilities that power intelligent experiences across the platform.
  • Develop reusable capabilities for model integration, reasoning, multimodal understanding, structured generation, evaluation, and other foundational AI functionality.
  • Optimize the AI systems that power these capabilities through experimentation, quantitative evaluation, context engineering, and iterative refinement.
  • Apply your production software engineering experience to build backend services, APIs, and distributed AI systems.
  • Partner closely with cross-functional partners to deploy scalable AI services that enable product teams to rapidly build AI-powered experiences.
  • Rapidly prototype emerging AI techniques and translate successful experiments into production-ready platform capabilities.
  • Support production systems by debugging failures and continuously improving latency, reliability, observability, and operational performance.
  • Stay current with advances in AI engineering, foundation models, and applied machine learning, applying them where they create meaningful customer value.
  • Optimize AI systems for performance, latency, reliability, scalability, and cost.
  • Contribute to a collaborative engineering culture focused on ownership and continuous learning.

Required Skills and Qualifications

  • Bachelor’s or Master’s degree in Computer Science, Machine Learning, or a related technical field, or equivalent practical experience.
  • 5+ years of experience building production software systems.
  • Strong software engineering skills with experience in Rust, Python, or similar programming languages.
  • Proven ability to build scalable backend services, distributed systems, APIs, or data-intensive applications.
  • Hands-on experience integrating large language models or other foundation models into production applications.
  • Ability to design, evaluate, and improve AI systems through experimentation, quantitative evaluation, and continuous iteration.
  • Familiarity with modern AI engineering patterns such as structured outputs, tool calling, context engineering, multimodal systems, or AI workflows.
  • Strong understanding of software engineering best practices, including testing, observability, reliability, and maintainability.
  • Demonstrated ability to take ownership of technically ambiguous projects from design through production.
  • Excellent communication and collaboration skills with the ability to work effectively across cross-functional teams.
  • Growth mindset and low ego, with a willingness to learn, adapt, and collaborate.

Preferred Skills and Qualifications

  • Experience building reusable AI capabilities or shared AI services.
  • Familiarity with deploying, optimizing, or serving open-source foundation models.
  • Knowledge of evaluation frameworks, benchmarks, or datasets for AI applications.
  • Experience with Kubernetes, cloud-native infrastructure, or distributed systems.
  • Experience developing production software in Rust.
  • Familiarity with retrieval-augmented generation (RAG), multimodal AI, AI agents, or model orchestration.
  • Domain expertise building complex AI systems such as multimodal reasoning, long-running inference workflows, AI agents, or model orchestration.
Compensation Information
$170,000—$200,000 USD

Equal Opportunity Statement

Legion provides equal employment opportunities to all employees and applicants for employment and prohibits discrimination and harassment of any type without regard to race, color, religion, age, sex, national origin, disability status, genetics, protected veteran status, sexual orientation, gender identity or expression, or any other characteristic protected by federal, state or local laws.

Apply at job-boards.greenhouse.io