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Lead I&C Field Engineer
Randstad USA
Chandler, AZ
- $59.35 to $77.03 USD / hour
…engineering excellence in an Onsite role as a Lead I&C Field Engineer in Chandler, AZ. The ideal candidate holds a Bachelor of Science degree along with 8+ years of experience in…
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Lead Salesforce Engineer
Randstad USA
Remote, United States
- $85 to $95 USD / hour
We're seeking an experienced IT engineer to contribute to our CRM platform. Reporting directly to the Senior Director, Salesforce Platform leader on our Enterprise Products and Platforms…
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Senior Software Engineer, AWS
Randstad USA
Remote, United States
- $75 to $85 USD / hour
…skills,resilient,Troubleshoot,AWS certification,AWS Certified DevOps Engineer - Professional,AWS Certified Developer - Associate,AWS Certified Solutions Architect -…
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Facilities Project Engineer
Randstad USA
Morris Plains, NJ
- $50 to $60 USD / hour
Join Our Client in an Onsite role as a Facilities Project Engineer in Morris Plains, NJ to drive transformative healthcare engineering! Requires BS in Engineering + 5+ yrs exp in GMP clean…
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Principal Software Engineers (Software Developers)
Randstad USA
Woburn, MA
- $186,161 to $186,200 USD / year
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MI
Technical Author
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- $30 to $37 USD / hour
Automotive experience is REQUIRED (Technician, Shop Foreman, Service Advisor, Technical Trainer, Field Engineer, Technical Writer, or similar background)
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Project Engineer
Cemtek Environmental
Santa Ana, CA
Project Engineer – Environmental Monitoring Systems
Added 1 min ago
UX Product Owner
STC
United States
Work with the Systems Architect and Systems Engineer to distill broader architectural principles into actionable UX system-level requirements and features.
Added 1 min ago
UX Scrum Master
STC
United States
…execution and the strategic flow managed by the Release Train Engineer…
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UX Test Engineer
STC
United States
…part of its growing EED support team, STC is seeking a Test Engineer to support the Consolidated Cumulus User Experience (Dashboard)…
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Product Manager (7342)
DeliverThat
Canton, OH
- $105,000 to $125,000 USD / year
The Merchant lane's mission: every merchant can get an order delivered, routed to the right fulfillment, visible in their Dashboard, and can change how they work with us without an engineer.
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E
Senior Account Manager
Everbridge
Remote, United States
- $100,000 to $110,000 USD / year
5+ years of dedicated experience in a successful sale, account management, sales engineer, or relevant role is required, working with Healthcare accounts
Added 1 min ago
SG
Technical Intern, Building Technology Summer 2027
Simpson Gumpertz & Heger
Boston, MA
- $30.25 to $38.25 USD / hour
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Professional Services Engineer - TAC
iDirect GOVERNMENT
Remote, United States
We are seeking an innovative, creative, and experienced Professional Services Engineer (PSE) who is ready for the challenges, responsibilities, and rewards that come with working in a…
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AI Engineer
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Jacksonville, FL
We are seeking an experienced AI Engineer to join a growing technology team focused on building intelligent, scalable, and cloud-native applications. This role is ideal for a hands-on…
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Data Engineer
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We are seeking a Senior Data Engineer to join a growing data and analytics team responsible for building modern, cloud-based data platforms that drive business intelligence, reporting, and…
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Furnace Mechanical Engineer I
T.EN
Houston, TX
The Furnace Mechanical Engineer – New Graduate supports the design, engineering, and technical execution of industrial furnaces, fired heaters, and associated mechanical equipment for…
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Audio Systems Engineering Intern
Starkey
Eden Prairie, MN
- $30 USD / hour
…and on-time hearing products to the market. The Audio System engineer intern will be responsible for assisting Audio system engineers in tasks related to the development and integration of…
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Associate Design Engineer, PWB Design
Moog Inc
Buffalo, NY
- $65,000 to $100,000 USD / year
Our team in the Space Sector’s Actuation and Avionics Business Unit is looking for an Associate Design Engineer, PWB Design to design complex, multilayer, high density, high power, high…
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System Engineer - Mid
Full Visibility LLC
Quantico, VA
Full Visibility is seeking a Systems Engineer Mid with
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Explosives Engineer
Accurate Energetic Systems Llc
McEwen, TN
…applications, is in search of a mechanical, manufacturing, or process engineer to join our growing team in middle TN. The candidate is expected to work in a fast paced manufacturing…
Added 2 mins ago
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Director of MEP Engineering
Trilon Group
East Brunswick, NJ
- $190,000 to $210,000 USD / year
An active New Jersey Professional Engineer (PE) license, with the ability to obtain licensure in surrounding states.
Added 3 mins ago
Senior Salesforce Engineer (Hybrid)
Enova International
Chicago, IL · 175 W. Jackson Blvd Chicago, IL
Senior Salesforce Engineer I: $98,000-$130,000
Added 4 mins ago
Power Electrical Engineer
HDR
Greenville, SC · Columbia, SC · Fort Mill, SC · Charleston, SC
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Structural Engineer
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…environment. This isn’t just a job, it’s a chance to lead innovation, engineer impact, and build a legacy of…

Spirit AI

Full-Stack Mobile Software Engineer

Alexandria, VA, United States
Arlington, VA, United States
Fairfax, VA, United States
Tysons, VA, United States
Washington, DC, United States

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Job details

Posting language: English

Original job description

🌟 Full-Stack Mobile Engineer (iOS & Android) About Spirit Spirit is an angel-backed, ambitious startup building an emotional, ethically-designed AI companion product that blends beautiful 3D/AR experiences, voice, and contextual memory - all powered by AI. Our goal is to create companions that feel alive, personal, and emotionally intelligent - not just chatbots, but presence. We’re a lean, hands-on team where every engineer owns major pieces of the experience. You’ll work directly with founders and AI engineers to define how people emotionally connect with digital beings - from interface to infrastructure.

About the Role We’re looking for a Full-Stack Mobile (and Web!) Engineer who can take Spirit from prototype to production. You’ll architect and build our cross-platform mobile app (iOS & Android), integrating real-time 3D avatars, LLM-driven interactions, and cloud-backed personalization. You’ll own both the frontend (React Native + AR) and backend (Node.js, Python, AWS) layers, ensuring seamless communication between the mobile client, our AI services, and memory databases. This role is perfect for someone who loves both creative engineering and product thinking - designing interfaces that feel magical while ensuring the systems behind them are fast, secure, and scalable.

Responsibilities

Design and build Spirit’s cross-platform mobile app (React Native + Expo or Flutter).
Design and build Spirit’s 3D web app (NextJS, Typescript, Tailwind).
Implement immersive 3D and AR experiences using React Native ARKit, Three.js, or Unity as a Library for avatar rendering and animation.
Develop APIs and backend services (Node.js + Express / NestJS or Python + FastAPI) that handle chat sessions, user memory, and personalization.
Integrate LLMs and AI APIs (OpenAI, Anthropic, or local inference models) for conversational and emotional intelligence.
Build real-time pipelines for chat, voice, and avatar interaction using WebSockets / Socket.IO.
Design and manage databases for context persistence (PostgreSQL + Redis or MongoDB + vector search like Pinecone / FAISS).
Deploy and scale backend systems using AWS (ECS / Lambda / API Gateway / DynamoDB) or GCP Cloud Run + Firestore.
Collaborate with designers to ensure fluid, emotionally resonant UI/UX - including transitions, animations, and interactions.
Maintain best practices in testing, version control (Git), CI/CD (GitHub Actions), and code documentation.
Drive architectural decisions for mobile performance, offline caching, and data privacy.

Tech Stack Frontend

React Native (TypeScript), Flutter for iOS/Android and NextJS, TailwindCSS for Web App
Expo / React Navigation / Redux Toolkit for structure
Three.js, Babylon.js, or Unity (as plugin) for 3D/AR
Lottie / Reanimated / Framer Motion for animation
WebRTC / WebSocket / Voice APIs for real-time communication

Backend

Node.js + Express/NestJS or Python + FastAPI
GraphQL / REST API integration
OpenAI, Gemini APIs for LLM integration
WebSocket / Socket.IO for low-latency messaging
Authentication via Clerk, Firebase Auth or Cognito

Database / Storage

PostgreSQL / Supabase for structured data
Redis / Pinecone / FAISS for embeddings and short-term memory
S3 / Cloud Storage for media, voice, and avatar assets

Cloud & DevOps

AWS (ECS Fargate, Lambda, API Gateway, S3, RDS) or GCP (Cloud Run, Firestore)
Docker for containerization
Kubernetes for container orchestration
GitHub Actions / CircleCI for CI/CD
Monitoring with Datadog or OpenTelemetry

Requirements

Proven experience building mobile and web apps (React Native or Flutter) from scratch.
Solid backend development experience (Node.js or Python) and ability to design RESTful or GraphQL APIs.
Strong grasp of frontend architecture, component design, and state management.
Knowledge of databases (SQL and NoSQL) and cloud deployment pipelines.
Familiarity with AI/LLM API integration (e.g., OpenAI, Hugging Face).
Excellent sense of UI/UX design, especially in animation, microinteractions, and user emotion.
Passion for real-time systems, 3D interfaces, and AR experiences.

Nice to Have

Prior experience with ARKit / ARCore / Unity3D.
Experience optimizing 3D rendering or motion design on mobile.
Exposure to LLM memory systems or vector databases.
Familiarity with privacy-first data design and local caching.
A personal app, open-source contribution, or creative tech project that showcases your imagination.

Why Join Spirit?

Work directly with founders on a product that merges AI, art, and emotion.
You’ll ship live to users - not into a backlog.
Learn cutting-edge tools in LLMs, AR, and 3D while shaping an early product from zero to launch.
Contribute ideas to product, design, and AI direction - you’re not just an engineer, you’re a co-creator.
Flexible remote setup, creative autonomy, and fast growth potential.
Exceptional contributors will be considered for early equity and leadership roles.
Be part of a collaborative, mission-driven team that values innovation, experimentation, and creative problem-solving.

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More about this job

Skills

React Native
Node.js
Python
AWS
Communication skills
Flutter
Next.js
Unity
PostgreSQL
Redis
MongoDB
Amazon DynamoDB
Google Cloud
Collaborate with designers
Git
CI/CD
GitHub
Documentation
TypeScript
React
GraphQL
DevOps
Docker
Kubernetes
Datadog
Back-end development
SQL
NoSQL
Hugging Face
UX design

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