Senior Software Engineer, Fermat Commerce
Agents
$220-250k
+ Equity package
AI native commerce platform
Open for applications
AI native commerce platform
21-100 employees
Open for applications
$220-250k
+ Equity package
21-100 employees
Company mission
To provide lighting-fast creation of high-converting, dynamic shopping experiences.
Role
Who you are
- If you love turning ambiguous problems into shipped experiences—and you have experience taking AI products to market in the last 12 to 18 months, this role is for you
- 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
Desirable
- 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)
What the job involves
- We’re searching for a product‑minded Software Engineer to help build out Pierre,
- FERMÀT’s AI Agent, into a production‑grade intelligence engine that powers personalization, automation, and operational insights across our commerce platform
- You will design and build LLM‑powered features end‑to‑end: orchestration (tools/agents/function‑calling), retrieval, evaluations and productionization (APIs, observability, cost/latency)
- 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
Our take
The rise of social media has awarded substantial social currency to influencer culture. Fermàt Commerce enables brands to embed shopping inside of influencer content, allowing consumers to do their online shopping whilst engaging with their daily content.
The eCommerce ecosystem has seen recent change with privacy policies, like the recent Apple privacy shift that prevents third-party cookie tracking, massively increasing the cost of discovering new customers. CEO, Rishabh Jain, was well placed to tackle this industry problem coming from LiveRamp. He understood the necessity of allowing brands to effectively scale first-party interactions and own first-party data.
Although relatively young, Fermàt’s integrated and frictionless solution for brands and influencers alike has raised multiple rounds of funding. This capital will see operations scale up, further product development, and increased partnerships, akin to that with Shopify.
Freddie
Company Specialist at Welcome to the Jungle
Company
Funding (last 2 of 3 rounds)
Jun 2025
$45m
SERIES B
Mar 2024
$17m
SERIES A
Total funding: $74m
Company HQ
China Basin, San Francisco, CA
Leadership
Rishabh Jain
(Co-Founder & CEO)Previously co-founded OpenLab app and Invisergy, acting as CEO for both. Spent nearly 6 years at LiveRamp, eventually as Vice President/Head of Innovation and New Business Initiatives.
Shreyas Kumar
(Co-Founder & CTO)Spent over 7 years at LiveRamp, eventually as Senior Director of Engineering. Studied and taught at Harvey Mudd College until 2014.
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