Full-Time
Senior Software Engineer
Agents
Posted on 2/7/2025
Fermat
51-200 employees
Direct-sales commerce infrastructure for creators
Compensation Overview
$190k - $220k/yr
Company Does Not Provide H1B Sponsorship
San Francisco, CA, USA
In Person
 Software Engineering (2) |
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- 4+ years of professional software engineering experience.
- 12–18 months building and shipping LLM-powered products (from prototype to GA) with meaningful customer adoption. Please include links, demos, or a brief write-up if possible.
- Strong Python and TypeScript experience. Solid systems design and API fundamentals.
- Hands-on with LLM APIs, embeddings, vector databases, retrieval patterns and agent/tool design.
- Pragmatic prompt engineering and prompt/version control
- Production chops: cloud (GCP), containers, CI/CD, monitoring/alerting; comfort owning services in prod.
- Product sense, clear communication, and a bias to ship.
- Take AI products to market: prototype quickly, instrument, A/B test, and iterate based on quality, conversion impact, latency, and cost.
- Own LLM orchestration: multi-agent systems, tool use, function‑calling, structured outputs, routing, context windows, retrieval and evals.
- Build evaluation & observability: golden datasets, automated evals, prompt/version management and monitoring.
- Productionize reliably: scalable APIs/services, workers/queues, caching and provider failover. Optimize performance while keeping costs reasonable.
- Data foundations: integrate first‑party events and catalog data; respect data contracts.
- Vendor strategy: evaluate and integrate multiple model providers (e.g., OpenAI, Anthropic, Google) while tracking quality, cost, and reliability.
- Raise the bar: document best practices, lead design reviews, and mentor engineers on AI patterns.
- E-commerce, recommendations, ranking or ads experience.
- Experience with streaming responses, Streamable HTTP/SSE/WebSocket patterns for real-time AI interactions.
- Real-time personalization and event pipelines (e.g., Kafka, pub/sub).
- Front-end (React) skills for rapid prototyping of AI UX.
- Experimentation/analytics tools (e.g., PostHog or similar).
Fermat Commerce builds a commerce infrastructure that helps creators and publishers sell directly to their audiences on the open web. Its platform lets creators onboard quickly, manage their products, images, and rates, and engage customers without middlemen. The product updates dynamically, tracks precise conversion attribution, and shortens the purchase funnel to boost sales. The company differentiates itself by focusing on creators and publishers who want direct control over sales and relationships, offering better rates and smoother onboarding through open web integration. The goal is to enable direct, high-conversion sales for creators while charging for the commerce infrastructure services that power these transactions.
Company Size
51-200
Company Stage
Series B
Total Funding
$74M
Headquarters
San Francisco, California
Founded
2021
Simplify's Take
What believers are saying
- Over 1 billion weekly AI interface users create massive addressable market for AI search commerce solutions.
- Full-funnel agencies adopting content commerce platforms signals strong demand for integrated ad-to-conversion solutions.
- $45M Series B funding from VMG accelerates feature development and competitive positioning in emerging category.
What critics are saying
- Shopify Magic generates AI-optimized landing pages natively, directly replacing FERMÀT's dynamic product page value.
- Google Shopping Graph integrates agentic shoppers into search results, bypassing FERMÀT's AI Search Commerce Engine.
- OpenAI Store launches integrated commerce for GPT users, rendering FERMÀT's engine obsolete for AI-driven traffic.
What makes Fermat unique
- FERMÀT uniquely bridges AI discovery and conversion by routing high-intent traffic from ChatGPT, Claude, and Gemini to optimized post-click experiences.
- Privacy-first commerce infrastructure unifies shopper signals without third-party cookies, addressing post-iOS tracking collapse.
- Agentic commerce specialization positions FERMÀT as category leader before mainstream adoption of AI agent purchasing.
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Benefits
Health Insurance
401(k) Retirement Plan
401(k) Company Match
Paid Parental Leave
Unlimited Paid Time Off
Home Office Stipend
Wellness Program
Equity Package
Growth & Insights and Company News
6 month growth
↓ -1%1 year growth
↑ 1%2 year growth
↑ 36%Cisco alum joins Finchetto to drive optical switching for AI. Former Cisco VP and Saisei Networks founder backs British startup's bid to shake up the switch market April 13, 2026 Optical network switch developer Finchetto has poached a Cisco alum to serve as a senior advisor. John Harper joins, having most recently served at Fermat, where, per his LinkedIn page, he was the firm's VP of engineering. - Finchetto Highlights of his lengthy CV include a seven-year engineering VP stint at Cisco, where he was responsible for routing, security, and related aspects of the firm's IOS software. Harper's prior roles also include spells at Hewlett Packard Enterprise (HPE) and Anagran. He also previously founded Saisei Networks, which developed a software tool providing advanced traffic management and analytics. It went on to be acquired by FirstWave in 2023. At Finchetto, Harper will serve as strategic advisor for the firm's technology and product roadmap, with the business looking to shake up the switch market with its AI-focused, fully optical, and passive line of network switches. Harper will work with Finchetto's founders and the board to "refine the company's long-term technical and commercial direction," the firm said upon announcement. "I've been involved in computer networking for large businesses that set the industry tone, and Finchetto's approach to photonic networking is genuinely distinctive with profound implications for AI and high-performance compute infrastructure," Harper said. "I'm looking forward to applying everything I've learned across the networking industry over the course of my career to help Finchetto realize its potential and expand in new ways." He'll be working with another recent hire, Kevin Crain, who serves as the firm's VP of engineering and product. Crain spent more than two decades at Intel across a variety of roles, culminating in director for accelerated compute and graphics marketing. "[Crain] and [Harper] bring exactly the combination of engineering rigor, product thinking, and strategic perspective that will help us turn Finchetto's optical switching breakthrough into a category-defining platform for AI and cloud infrastructure," said Mark Rushworth, co-founder and CEO of Finchetto. The startup's photonics-based networking switches aim to solve both power and latency issues in data center interconnects. Its fully-optical, passive systems are designed to reduce energy consumption and offer ultra-low port-to-port latency. Rushworth previously claimed its switch - which is currently in prototype - "can bring energy consumption down by over 20x, reduce latency by 40x and switch at the speed of the surrounding transceivers." The British-based startup is working with BT to identify potential use cases where its switch lines could be used to boost telecom networks. Finchetto also recently teamed up with Irish integrated lasers firm Pilot Photonics to leverage the latter's line of nanosecond tunable lasers in the development of Finchetto's switch devices. More in workforce & skills.
FERMÀT raises to launch ai-powered commerce platform.
When we started FERMÀT, we saw an urgent need: marketers were struggling to deliver tailored shopping experiences across the multitude of channels consumers use to engage with brands. Privacy shifts had broken many of the traditional playbooks, and the tools on the market weren’t designed for marketers who wanted to match every message with a journey.
VMG Leads Investment in Platform Generating Shopping Journeys for Human and Agentic Shoppers SAN...
FERMÀT, a Bay Area-based AI-native commerce platform, has raised $45 million in a Series B funding round led by VMG Partners, with participation from QED Investors, Greylock, Bain Capital Ventures and Courtside Ventures.