AI Product Engineer (Nexus)

Fireworks AI; San Mateo (CA); On-site; USD 180,000 - 260,000; Full time

Job summary

Fireworks AI is seeking a product-minded engineer to join as a Member of Technical Staff, owning surfaces that drive our intelligent router, FireConnect integrations, and the core platform for AI workloads.

This high-autonomy IC role ships production-grade features end-to-end for deeply technical users, spanning frontend React/TypeScript, backend Python/Go, APIs, and data layers, with emphasis on measurable impact.

Qualifications

• 3+ years as a software engineer with user-facing products.
• Strong full-stack experience across frontend, backend, APIs.
• Experience shipping developer-facing products.
• Experience with AI tooling and inference platforms.

Responsibilities

• Own surfaces end-to-end from problem understanding to design, shipping, and monitoring usage.
• Build routing and migration layers that optimize cost while directing tasks to appropriate models.
• Extend and integrate FireConnect with external APIs to enable easy adoption.
• Collaborate with Infrastructure, Applied Research, Growth, Data, and Design to turn platform capabilities into developer-friendly products.
• Instrument everything you build and iterate based on data.

Skills

3+ years software engineering

Full-stack development

React/TypeScript

Python/Go

APIs

Developer experience

Ownership

AI tooling

Tools

React

TypeScript

Python

Go

Job description

• We’re looking for a product-minded engineer to join as a Member of Technical Staff and own the surfaces that make this real: the intelligent router that scores and directs every request, the cost-observability and enterprise-control layers that give an org visibility over its entire AI footprint, the FireConnect integrations that make adoption a single command, and the core platform underneath; inference APIs, the developer console, and fine-tuning workflows
• This is a high-autonomy IC role on a small team building something that ships to production the day you write it, at a scale almost nowhere else can offer
• You’ll own features end to end — from understanding the problem, to designing the solution, to shipping it, to watching how developers actually use it
• Own product features end-to-end across Nexus and the broader Fireworks platform, the intelligent router, FireConnect harness integrations, cost observability, enterprise controls and policy, the developer console, API surfaces, the model playground, fine-tuning workflows, and billing, scoping the problem, building it, shipping it, instrumenting it, and iterating on real usage
• Build the routing and migration layer that scores request difficulty in real time and sends routine work to open models while passing hard tasks through to a customer’s existing provider, the system that delivers 3–5x cost reductions without sacrificing quality
• Make adoption frictionless: extend FireConnect and our Anthropic- and OpenAI-compatible APIs so a team can drop Nexus into their existing tools with just a base URL and a model ID, and improve the caching and infra paths that turn that into material cost savings
• Work across the full stack, frontend (React/TypeScript), backend services (Python, Go), APIs, and data layers, to ship polished, production-quality product surfaces for deeply technical users
• Build for products evolving week to week: new models, new serving paths, new consumption models, new enterprise controls, and new multi-agent harness tooling
• Partner closely with Infrastructure, Applied Research, Growth, Data, and Design to turn raw platform capability into products developers love
• Instrument everything you build and let the data tell you where the friction is — then remove it

If you’re the kind of engineer who ships things other people think are impossible, on timelines other people think are impossible, this is a place where that has enormous leverage and nothing standing between you and impactStrong product instincts: you optimize for the developer experience, not just the diffThe ability to operate at high velocity with extreme ownership: you ship fast, make pragmatic trade-offs, and don’t wait to be told what to buildA track record of shipping developer-facing products: APIs, dashboards, consoles, CLIs, or developer tools3+ years as a software engineer, with meaningful time spent building and shipping user-facing productsStrong full-stack skills, comfortable across frontend (React/TypeScript), backend (Python, Go, or similar), APIs, and databasesGenuine end-to-end ownership, you’re as comfortable scoping an ambiguous problem as you are deploying the fix at 2amYou build with AI tools every day, and you have sharp intuition for what a great AI developer experience feels like from the insideComfort in a fast-moving, founder-led environment where the product changes week to week and you’re drawing the map as you walk itExperience building for deeply technical users, where the product surface is an API as much as a UIExperience building products on top of complex infrastructure, inference platforms, cloud services, data platforms, or ML tooling