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Harmonic

Software Engineer, Infrastructure

London
Level
Mid
Work type
On-site · London

Not stated in the posting: salary, visa.

Open. First seen 2 October 2026.

Apply on the company's site →

About the role

Harmonic's standard text

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)
Harmonic's standard text

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.

What this role asks for

In most of Harmonic's ads

Python

Named in most of its open postings, whatever the role.

57% of this description is written for the role. The rest is Harmonic's standard text, folded away below.

Read against Harmonic's other open postings on this site.

The team: Engineering

This role is one of 10 open in Engineering.

WHAT THE TEAM WORKS WITH, ACROSS ITS POSTINGS

Python (8 of 10), C++ (4 of 10), AWS (3 of 10), Azure (3 of 10), GCP (3 of 10), Kubernetes (3 of 10), Machine Learning (3 of 10)

OTHER ROLES ON THIS TEAM

From the team and dates on Harmonic's own job board.

Salary context

18 other open postings titled Software Engineer, Infrastructure state a salary: median USD 180,000 to USD 275,000 a year.

See Software Engineer salaries in London →

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