Senior Full-Stack AI Engineer (Web + iOS)

TWG Global AI•Santa Monica, CA

7d•$190,000 - $200,000•Onsite

About The Position

At TWG Group Holdings, LLC (“TWG Global”), we drive innovation and business transformation across a range of industries—including financial services, insurance, technology, media, and sports—by leveraging data and AI as core assets. Our AI-first, cloud-native approach delivers real-time intelligence and interactive business applications, empowering informed decision-making for both customers and employees. We prioritize responsible data and AI practices, ensuring ethical standards and regulatory compliance. Our decentralized structure enables each business unit to operate autonomously, supported by a central AI Solutions Group, while strategic partnerships with leading data and AI vendors fuel game-changing efforts in marketing, operations, and product development. You will collaborate with management to advance our data and analytics transformation, enhance productivity, and enable agile, data-driven decisions. By leveraging relationships with top tech startups and universities, you will help create competitive advantages and drive enterprise innovation. At TWG Global, your contributions will support our goal of sustained growth and superior returns, as we deliver rare value and impact across our businesses. The Role We're hiring a Senior Software Engineer to build agentic AI products across web, backend, and iOS. You'll own features end-to-end, from agent design and orchestration logic through React UIs and native mobile clients, and you'll be responsible for the evaluation systems that keep agent quality from regressing as the platform grows. You should be comfortable moving between a Spring Boot service, a Python agent layer, a React frontend, and a Swift iOS app in the same week. You should also have strong opinions about how to measure whether an agent is getting better. You'll work closely with product, design, and other engineers, and you'll mentor more junior teammates.

Requirements

5+ years building production software at scale
Hands-on experience building real LLM and agent applications, not demos. You've designed tool interfaces, orchestrated multi-step workflows, handled failure modes in agent loops, and shipped something users depend on
Direct experience with agent evaluation: building golden datasets, running offline evals, scoring tool calls and trajectories, and using eval results to drive prompt, model, and architecture changes. Familiarity with frameworks like Braintrust, LangSmith, Inspect, or comparable custom harnesses
Strong React, including state management, component design, and performance
Strong Java with Spring Boot, plus working proficiency in Python
iOS development with Swift and SwiftUI, including App Store release experience and APNs
Relational database design (PostgreSQL preferred)
Comfort with distributed systems, async messaging, and modern service architecture
Cloud infrastructure (AWS, GCP, or Azure) and CI/CD
Bachelor's degree in CS, Engineering, or equivalent practical experience

Nice To Haves

Experience with LangGraph specifically, or having built comparable orchestration from scratch
Multi-provider LLM work (Anthropic, OpenAI, Google, xAI) and MCP servers or clients
Redis Streams or similar async messaging at production scale
Multi-tenant SaaS with non-trivial RBAC and auth
On-device ML on iOS (CoreML, NLContextualEmbedding) or audio pipelines (Whisper, TTS)
Prior experience working with Palantir Foundry is a big plus
Work on real-world AI applications with high-impact clients

Responsibilities

Design, build, and operate agent-based software that executes multi-step tasks with tools, memory, and stateful workflows using LangGraph or equivalent frameworks
Build and maintain evaluation pipelines for LLM and agent quality: offline eval suites, regression tests, tool-call and trajectory scoring, and the dashboards and tooling that make results actionable
Lead development of React frontends with clean component architecture, sensible state management, and real performance work
Ship features in our native iOS app, including UI, networking, push notifications, and release management
Design and maintain backend services, REST APIs, and data models in Java (Spring Boot) and Python
Contribute to system design across multi-tenant infrastructure, auth, and async messaging
Drive code quality, testing discipline, and engineering standards
Mentor junior engineers and raise the bar through code review and design feedback