Senior AI Experience Engineer — Build Production AI UIs
PortX, Inc.
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Job summary
PortX, Inc. seeks a Senior AI Experience Engineer in Seattle to design and deliver AI-powered features across web and mobile apps.
You will build production-ready AI experiences using LLMs, agents, and external APIs, focusing on intuitive, user-led interfaces and scalable workflows. You will prototype advanced AI capabilities, integrate third-party AI services, and collaborate with product, design, and backend teams to ensure high-quality experiences.
Qualifications
- At least 5 years of software engineering experience, backend or full-stack preferred.
- Advanced Python skills with production services experience.
- Experience creating AI agents using LangChain, Semantic Kernel, or similar.
- APIs and UI work with modern JS frameworks (React).
- Knowledge of foundation model APIs (OpenAI, Anthropic, Cohere, Google).
- Prompt engineering, tool chaining, and LLM-driven interactions.
- REST, embeddings, vector stores, and AI performance assessment.
Responsibilities
- Build AI-powered product features using OpenAI, Claude, Vertex AI, and custom APIs.
- Prototype and evolve smart user experiences including chat and workflows.
- Embed third-party AI services into web and mobile products with security and scalability.
- Collaborate with product, design, and UX to shape AI functionality.
- Optimize prompts, orchestration, and fallback mechanisms for consistency.
- Coordinate with data/backend teams to ensure reliable data for AI apps.
- Track and improve live AI experiences via analytics and experiments.
Skills
Tools
Job description
Seattle, WA
Full-time • Hybrid
PortX is a leading AI-powered data and integration company for modern banking, bringing systems together and data to life through our unified platform for modern integration, governed customer 360 data, and next-generation payments.
We're in strong growth mode, with opportunities for Senior Software Engineers, working in a high-impact environment, with a great culture that's open and rewarding, so it's a great time to join.
We’re committed to innovation and efficiency, and looking for a Senior AI Engineer with a passion for leveraging AI to transform the way software is built.
In addition to a competitive basic salary, benefits include an attractive equity package, insurance (medical, dental, vision), unlimited PTO, and 401(k).
About the Role
We are looking for an innovative and technically strong Senior AI Experience Engineer to create AI-powered products and experiences that are intuitive, effective, and user-led. The role involves designing, integrating, and improving AI functionality using LLMs, agents, and external APIs. The emphasis is not on model training or deep ML research, but on delivering polished production-ready AI experiences that users can rely on.
You’ll be well suited to this role if you are excited by the idea of building intelligent assistants, adaptive workflows, and high-quality AI features that feel useful, natural, and thoughtfully designed.
Key Responsibilities
Build innovative product features powered by AI technologies, using tools such as OpenAI, Claude, Vertex AI, and custom-built API solutions.
Rapidly prototype and evolve smart user experiences, including chat-based tools, summarisation capabilities, recommendation features, and automated workflows.
Embed third-party AI services into web and mobile products while maintaining high standards of security, responsiveness, and scale.
Collaborate with product managers, designers, and UX specialists to shape AI functionality into seamless customer experiences.
Optimise prompts, orchestration patterns, and fallback mechanisms to improve consistency and output quality.
Partner with data engineering and backend teams to ensure relevant, reliable data flows into AI-driven applications.
Track, test, and continuously enhance live AI experiences using analytics, experimentation, and human review processes.
Mandatory Qualifications
At least 5 years of experience in software engineering, preferably with a backend or full-stack background.
Advanced Python skills, with a track record of building and maintaining live production services.
Practical experience creating AI agents, using agent frameworks such as LangChain, Semantic Kernel, or similar custom-built solutions, and designing multi-step workflows.
Experience developing APIs and user-facing interfaces with modern frameworks such as JavaScript/TypeScript and React.
Knowledge of foundation model APIs from providers such as OpenAI, Anthropic, Cohere, and Google.
Experience in prompt engineering, tool chaining/orchestration, and designing interactions powered by LLMs.
Strong grasp of RESTful services, embeddings, vector stores, and methods for evaluating AI system performance.
Excellent interpersonal and collaboration skills, with the ability to work effectively across technical and product functions.
A proactive, ownership-led mindset, with the ability to navigate ambiguity and demonstrate rigorous, determined problem solving.
Preferred Qualifications
Experience with retrieval-augmented generation (RAG), memory components, model routing, or multi-agent systems.
Familiarity with AI agent monitoring tools such as Humanloop, PromptLayer, or LangSmith.
Experience working with Model Context Protocol (MCP)
Understanding of cloud-based infrastructure (AWS, Azure, or GCP) and scalable app deployment.
Knowledge of ethical AI practices and secure, responsible AI deployment patterns.
Why You’ll Love This Role
You’ll lead the development of next-gen AI experiences—transforming how users and systems interact with intelligent systems.
You’ll join a high-impact, fast-moving team with the autonomy to experiment and innovate.
You’ll help define the best practices in an emerging discipline at the intersection of engineering, design, and intelligence.
Why Join PortX
At PortX, you’ll be joining an amazing team with a great culture, working at the forefront of technological innovation. If you’re excited by the possibilities of AI-driven development, and excited by the opportunity to be part of a fast-growing company that’s revolutionizing data integration technology in the banking sector, we’d love to speak with you.
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