Software Engineer, Infrastructure
AI in this role
About Harmonic
At Harmonic, we are building a mathematical reasoning engine that operates with absolute precision. While most AI makes maximum-likelihood guesses, Harmonic's Aristotle uses Lean4 and reinforcement learning to verify its reasoning and results.
Following our Gold Medal-level performance on the 2025 International Math Olympiad (IMO) and the successful resolution of long-standing open problems, we are proving that AI can master the most rigorous domains of human thought. Backed by some of the world’s most prominent investors, we are intentionally scaling an elite technical team.
Visit our company blog to learn more about what we are working on!
About the Role
We are seeking a talented Software Engineer to build infrastructure systems from scratch, bridging the gap between our research and product development. In this role, you will develop robust, scalable software systems behind our product based on the discoveries and advancements in AI from our researchers. We are looking for a problem-solver that has experience working on complex, distributed systems and are passionate about advancements in AI and software development.
Key Responsibilities
Collaborate with AI research scientists to translate state-of-the-art research into practical, scalable software infrastructure
Participate in the entire software development lifecycle including: requirement analysis, design, coding, testing, reviewing, deployment, and support
Ensure the scalability, efficiency, and reliability of software systems through the entire development lifecycle
Write clean, efficient, and well-documented code
Work cross-functionally with product managers, designers, and other engineering teams to deliver high-quality product
Minimum Qualifications
BS in Computer Science, Engineering, or a related field
2+ years of relevant industry experience
Proficiency in one or more programming languages (e.g., Python, C++, etc)
Experience building, scaling, and maintaining large-scale distributed systems
Experience with modern software development practices including coding standards, code reviews, source control management, build and deployment processes, and testing.
Proven track record operating successfully in a fast-paced, collaborative environment
Preferred Qualifications
MS or PhD degree in Computer Science, Engineering, or a related field.
5+ years of relevant industry experience
Prior experience in developing products from concept to launch
Experience with building core cloud technologies including: infrastructure, security, platforms and services (e.g., AWS, Azure, GCP, Kubernetes, etc)
What We Offer
Unlimited PTO
401(k) matching
100% employer-paid health, vision, and dental benefits for employees and 50% coverage for dependents. Harmonic offers varied health coverage options to select what is best for you and your family.
Health Savings Account (HSA) available for qualifying health plans
Equal Opportunity Statement
Harmonic is committed to diversity and inclusivity in the workplace. We are an equal opportunity employer and do not discriminate on the basis of race, religion, national origin, gender, sexual orientation, age, veteran status, disability or any other legally protected status.
How we rate this
Software Engineer, Infrastructure at Harmonic rates 86 out of 100 for how much of the daily work is AI. That makes it Builds AI (AI Level 4 of 4). The level is about AI in the job, not seniority.
Builds AI. The job is building AI systems.
- ●●●● Builds AI80 to 100
- ●●●○ Works on AI60 to 79
- ●●○○ Uses AI40 to 59
- ●○○○ Little AI0 to 39
Levels come from how often the tools, models and workflows of the role are named in the posting itself. Open the description and count.
Prepare for this job
A free preview built only from this posting: what it asks for, what you could be asked in an interview, and how to adjust your resume.
Skills and AI tools this role asks for
Questions you could be asked
- Tell me about a research question you investigated. What did you find?
- How would you decide a model or AI system is ready to ship?
- Tell me about a time a model underperformed in production. How did you find out, and what did you change?
Adapt your resume
- List these exact terms on your resume: AI Research. An applicant tracking system matches the wording, not the idea.
- Attach one line of real, concrete experience to at least one of them — a tool named with nothing behind it rarely survives a human read.
- Lead with what you built, trained or shipped — this role is judged on the AI system itself, not the tools around it.
Want an expert to read your CV for this job?
Free. Send your CV and the role you want next. We reply by email within 2 to 4 business days.
Get a free CV reviewGet new software engineer jobs (Builds AI ●●●●) by email
One email a week with the new software engineer jobs (Builds AI ●●●●), each rated for how much AI is in the work. No recruiter spam, unsubscribe in one click.
Free. One email a week. Unsubscribe in one click.
Similar roles
Software Engineering roles that build AI, at other companies.
What kind of AI work fits you?
Answer 12 practical questions in about three minutes. Get a simple profile, the work it points to, and live roles to explore next.
Find my next step