Jobs in the United States

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Added 6 mins ago
Senior Robotics Engineer
Azalea Robotics Corporation
Berkeley, CA
As a Senior Robotics Engineer at Azalea Robotics, you will own core autonomy software end to end: from the localization, mapping, and steering that drive the mobile bases in our ARC 1…
Added 8 mins ago
Senior Controls Engineer
Churchill Technologies
Grand Haven, MI
The Senior Controls Engineer is responsible for the design, development, programming, and commissioning of control systems for automated machinery and industrial processes. This role…
Added 8 mins ago
Full-Stack Mobile Software Engineer
Spirit AI
Alexandria, VA · Arlington, VA · Fairfax, VA · Tysons, VA · Washington, DC
🌟 Full-Stack Mobile Engineer (iOS & Android)
Added 9 mins ago
Data Engineer
Deep Digital Solutions Group
United States
Job Description: Deep Digital are seeking a highly skilled and experienced Senior Data Engineer with a proven track record in successfully implementing, optimizing, and maintaining the data…
Added 10 mins ago
FS
Principal Software Engineer (Embedded Systems)
Fastechnowiz Solutions LLC
Norwalk, CT
- $190,000 to $200,000 USD / year
As a software engineer, you'll tackle challenges that blend hardware and software - working on things like machine learning for organizing and categorizing algorithms, real-time system…
Added 12 mins ago
T
Full Stack Engineer
Talented.co
Bellevue, WA
- $140,000 to $180,000 USD / year
We are a rapidly growing tech company focused on AI Voice. We are looking for a talented and passionate Full Stack Engineer to join our dynamic team and contribute to the development of…
Added 13 mins ago
Engineering Manager
Kyoto Fusioneering America
Oak Ridge, TN
…governance structures, design authority frameworks, formal change control processes, and configuration baseline management across all…
Added 14 mins ago
Associate Director, Power Systems Engineering
Scout Clean Energy
Boulder, CO
…transformers, breakers, protection systems, SCADA systems, power plant control systems, substations, and transmission…
Added 14 mins ago
LA
Junior Environmental Engineer
LaBella Associates
Rochester, NY
- $65,000 to $85,000 USD / year
We are looking for an engineer who is interested in solving water resources and environmental challenges through a combination of traditional engineering and nature-based approaches. A…
Added 14 mins ago
B
Construction Inspector - PTV Roadway
BKF
Anaheim, CA
- $125,000 to $160,000 USD / year
Advises Resident Engineer or Agency Project Manager and informs contractors of any variances from approved plans and specifications
Added 14 mins ago
B
Construction Inspector - PTV Roadway
BKF
Newport Beach, CA
- $125,000 to $160,000 USD / year
Advises Resident Engineer or Agency Project Manager and informs contractors of any variances from approved plans and specifications
Added 14 mins ago
B
Construction Inspector - PTV Roadway
BKF
Riverside, CA
- $125,000 to $160,000 USD / year
Advises Resident Engineer or Agency Project Manager and informs contractors of any variances from approved plans and specifications
Added 14 mins ago
B
Construction Inspector - PTV Roadway
BKF
Los Angeles, CA
- $125,000 to $160,000 USD / year
Advises Resident Engineer or Agency Project Manager and informs contractors of any variances from approved plans and specifications
Added 14 mins ago
B
Construction Inspector - PTV Roadway
BKF
San Bernardino, CA
- $125,000 to $160,000 USD / year
Advises Resident Engineer or Agency Project Manager and informs contractors of any variances from approved plans and specifications
Added 14 mins ago
B
Construction Inspector - PTV Roadway
BKF
Laguna Beach, CA
- $125,000 to $160,000 USD / year
Advises Resident Engineer or Agency Project Manager and informs contractors of any variances from approved plans and specifications
Added 14 mins ago
B
PTV Traffic Signal Inspector
BKF
Anaheim, CA
- $125,000 to $160,000 USD / year
Advises Resident Engineer or Agency Project Manager and informs contractors of any variances from approved plans and specifications
Added 14 mins ago
B
PTV Traffic Signal Inspector
BKF
Newport Beach, CA
- $125,000 to $160,000 USD / year
Advises Resident Engineer or Agency Project Manager and informs contractors of any variances from approved plans and specifications
Added 14 mins ago
B
PTV Traffic Signal Inspector
BKF
Riverside, CA
- $125,000 to $160,000 USD / year
Advises Resident Engineer or Agency Project Manager and informs contractors of any variances from approved plans and specifications
Added 14 mins ago
B
PTV Traffic Signal Inspector
BKF
Los Angeles, CA
- $125,000 to $160,000 USD / year
Advises Resident Engineer or Agency Project Manager and informs contractors of any variances from approved plans and specifications
Added 14 mins ago
B
PTV Traffic Signal Inspector
BKF
San Bernardino, CA
- $125,000 to $160,000 USD / year
Advises Resident Engineer or Agency Project Manager and informs contractors of any variances from approved plans and specifications
Added 14 mins ago
B
PTV Traffic Signal Inspector
BKF
Laguna Beach, CA
- $125,000 to $160,000 USD / year
Advises Resident Engineer or Agency Project Manager and informs contractors of any variances from approved plans and specifications
Added 17 mins ago
MN
Engineer - Life Safety Systems & Telecom (NY)
Micron New York Semiconductor Manufacturing LLC
Clay, NY
- $82,000 to $169,000 USD / year
As a Fire Alarm / Life Safety Systems Engineer, you will provide technical leadership for life-safety systems across construction projects. You will independently evaluate developments,…
Added 17 mins ago
RT
[Ram Chirimunj] Software Engineer
RTC Talent
San Francisco, CA
- $125,000 to $175,000 USD / year
We’re looking for a Software Engineer with 2+ years of professional experience to join our small but mighty team. You’ll work closely with founders and other engineers to design, build, and…
Added 17 mins ago
S
Software Engineer
SSTi
Dahlgren, VA
- $150,000 to $180,000 USD / year
SSTi is seeking a Software Engineer in safety-critical software development for missile systems and weapon system test equipment. The ideal candidate will drive design, development,…
Added 17 mins ago
Chief Engineering
Hyatt Centric SouthPark Charlotte
CHARLOTTE, NC
The Chief Engineer at a Hyatt hotel leads the engineering and maintenance department, managing the physical plant, equipment, and facility operations to ensure guest safety, comfort, and…

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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