Jobs in the United States

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Added 1 min ago
CI
Embedded Software Test Automation Engineer
Cintal, Inc.
Chillicothe, IL
- $90,000 to $110,000 USD / year
We are committed to building a diverse, inclusive, and global team. Candidates must be authorized to work in the United States. We are pleased to offer visa sponsorship for eligible and…
Added 3 mins ago
AC
GENERAL ENGINEER
Air Combat Command
Shaw AFB, SC
- $89,508 to $116,362 USD / year
The primary purpose of this position is to serve as a professional general engineer, performing design, project programming, construction management/monitoring duties and improvement…
Added 7 mins ago
Senior Full Stack Java Engineer - Workforce Management (WFM)
Miratech
Remote, United States
We are looking for a Senior Full Stack Engineer to join the Workforce Management product stream and build enterprise-scale solution supporting forecasting, capacity planning, scheduling,…
Added 7 mins ago
Senior Full Stack Java Engineer - Workforce Management (WFM)
Miratech
Remote, United States
We are looking for a Senior Full Stack Engineer to join the Workforce Management product stream and build enterprise-scale solution supporting forecasting, capacity planning, scheduling,…
Added 24 mins ago
Senior Lead Engineer - Design Verification
Altera Corporation
San Jose, CA
Altera is seeking a Senior Lead Engineer - Design Verification to provide hands-on technical leadership for the verification of next-generation FPGA, programmable SoC, and platform…
Added 25 mins ago
A
Software Engineer – Distributed Systems
Alluxio
Foster City, CA
- $230,000 to $330,000 USD / year
As a Sr. Staff Software Engineer – Distributed Systems at Alluxio, you will lead the end-to-end architecture and technical evolution of our next-generation distributed data platform. You…
Added 26 mins ago
E T Consultant
World Bank Group
Washington, DC
…Funds and Trust Funds). ITSFI is additionally responsible for building its IT services using a shared platform that provides scale, leverage, reliability, and control while at the same time…
Added 28 mins ago
J
Senior Machine Learning Engineer, Inference
Jobgether
Remote, United States
- $250,000 to $300,000 USD / year
The ideal candidate is a senior-level machine learning inference or systems engineer with strong hands-on experience optimizing production inference engines and building scalable GPU…
Added 32 mins ago
O
Senior Network Developer
Oracle
Seattle, WA · Nashville, TN · Redwood City, CA · Santa Clara, CA · Reston, VA
- $91,400 to $187,000 USD / year
As a Sr Network Development Engineer, you will be responsible for helping design, build, test, deploy and operate highly scalable solutions to support Oracle’s next-generation Cloud…
Added 37 mins ago
Full Stack Java Engineer
Miratech
Remote, United States
We are looking for a Full Stack Engineer to design, develop, and support scalable cloud-native applications that power Workforce Management (WFM), Customer Experience (CX), and operational…
Added 44 mins ago
DO
Engineer, Water Resources
Department of Water Resources
CA
- $6,488 to $12,152 USD / month
Under the supervision of a Senior Engineer, Water Resources in the Central Valley Modeling Section of the Modeling Support Office, is responsible for developing and maintaining present and…
Added 47 mins ago
A
Railroad Bridge Engineer
AECOM
Sacramento, CA
- $140,000 to $240,000 USD / year
AECOM is seeking a Railroad Bridge Engineer for one of our offices in Sacramento, Bakersfield, or Fresno CA.
Added 47 mins ago
A
Railroad Bridge Engineer
AECOM
Fresno, CA
- $140,000 to $240,000 USD / year
AECOM is seeking a Railroad Bridge Engineer for one of our offices in Sacramento, Bakersfield, or Fresno CA.
Added 47 mins ago
A
Railroad Bridge Engineer
AECOM
Bakersfield, CA
- $140,000 to $240,000 USD / year
AECOM is seeking a Railroad Bridge Engineer for one of our offices in Sacramento, Bakersfield, or Fresno CA.
Added 47 mins ago
Process Engineer Staff
Plexus Manufacturing Sdn. Bhd.
Neenah, WI
When we invest in our people, we invest in building a better world.
Added 51 mins ago
EG
Quality Assurance Engineer - PHP
Eliassen Group
Cheyenne, WY
- $40 to $50 USD / hour
Our client seeks a results-driven Senior Quality Assurance Engineer to support Policyholder Portal applications. The role requires manual, automation, mobile, API, and database testing…
Added 51 mins ago
EG
Workday Adaptive Planning Engineer
Eliassen Group
Cheyenne, WY
- $65 to $75 USD / hour
Our client is seeking a Workday Adaptive Planning Engineer to design, build, and maintain financial planning and forecasting solutions. The role partners with FP&A, Accounting, and Finance…
Added 57 mins ago
I
Member of Technical Staff, Product Security
Inferact
San Francisco, CA
- $200,000 to $400,000 USD / year
…product, and forward-deployed engineering teams, and with the engineer who owns vLLM vulnerability management when an upstream issue affects our product. You'll set the direction for…
Added 58 mins ago
Software Engineer- Semiconductor Technology (C#/.NET)
Keysight Technologies, Inc.
Santa Rosa, CA
This role is about software engineering: designing, building and improving software that others depend on. We work closely with partner teams like test engineering: they own measurements…
Added 1 hour ago
Staff Machine Learning Engineer（Risk Intelligence/AI Agent）
OKX
San Jose, CA
Building machine learning systems for risk at a global crypto exchange is fundamentally different from conventional ML engineering. The data spans on-chain activity, fiat deposits and…
Added 1 hour ago
Senior Software Engineer - Cloud SaaS - IE&A
Jobgether
Remote, United States
…and next steps. Our partner is looking for a Senior Software Engineer – Cloud SaaS – IE&A based in the United…
Added 1 hour ago
Consultant, Data Engineer - Reference Data Management
AB3 Nationwide Life and Annuity Insurance Co
OH · AZ
As a Data Engineer, you’ll be responsible for acquiring, curating, and publishing data for analytical or operational uses. Data should be in a ready-to-use form that creates a single…
Added 1 hour ago
T
Elasticsearch Engineer *No C2C*
TEKsystems
Lincoln, MA
- $120,000 to $250,000 USD / year
Experience managing Elasticsearch index lifecycle policies, index templates, and data streams at scale, and building Kibana dashboards, visualizations, and lens-based analytics for security…
Added 1 hour ago
Electrical Engineer, RDPI
Amazon
Westboro, MA
As an Electrical Engineer on our team, you will design industrial control panels, select and integrate sensors and components, and develop electrical systems for packaging and sortation…
Added 1 hour ago
N
Seasonal & Regular Commission Sales - Natick Mall
Nordstrom
Natick, MA
- $15.25 USD / hour
…genuine care to every interaction. You love fashion, thrive on building relationships, and take pride in creating an experience that brings customers back. This is a professional sales role…

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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