Jobs in the United States

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Added just now
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 just now
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 8 mins ago
E T Consultant
World Bank Group
Washington, DC
ITSFE is seeking a skilled and experienced Solution Engineer to join our growing team as an ET Consultant. The Solution Engineer will design, build, enhance, and support web-based solutions…
Added 12 mins ago
High-Speed Signal Integrity Engineer
Advanced Micro Devices, Inc
Santa Clara, CA
We are looking for a dynamic and motivated Signal Integrity Engineer to join our Server Platform Signal and Power Integrity (SIPI) team. As a member of AMD's Server Platform organization,…
Added 15 mins ago
IT Software Engineer, EA EPS
Micron Technology, Inc.
Boise, ID
Understand end-to-end business processes, system integrations, and data flows across enterprise planning platforms, and assess upstream and downstream impacts of application and software…
Added 17 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 18 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 19 mins ago
E T Consultant
World Bank Group
Washington, DC
ITSFE is seeking a skilled and experienced Solution Engineer to join our growing team as an ET Consultant. The Solution Engineer will design, build, enhance, and support web-based solutions…
Added 21 mins ago
J
Software Engineer Lead
Jobgether
Remote, United States
- $105,000 to $135,000 USD / year
This position is listed on behalf of a partner company, who manages all applications and next steps. Our partner is looking for a Software Engineer Lead based in the United States.
Added 21 mins ago
J
Senior Machine Learning Engineer, Inference
Jobgether
Remote, United States
- $250,000 to $300,000 USD / year
…steps. Our partner is looking for a Senior Machine Learning Engineer, Inference based in the United…
Added 23 mins ago
Sr. Engineer - Electrical Maintenance
MAHLE
Pithampur, IN
Data analysis skills for troubleshooting and resolving root cause analysis of machine defects.
Added 25 mins ago
Principal Electrical Engineer
Oracle
Santa Clara, CA · Burlington, MA
Oracle's Hardware Development Organization seeks to add an experienced On-Board Power Engineer to work within our Server Development team in Santa Clara, California or in Burlington MA. As…
Added 25 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 30 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 37 mins ago
DO
Engineer, Water Resources
Department of Water Resources
CA
- $6,488 to $12,152 USD / month
…of California with your insight, knowledge and modeling and data analysis skills? Discover your full potential and develop your career with us. The Central Valley Modeling Section is…
Added 40 mins ago
A
Mid-Level Civil Construction Engineer (4 years experience required)
AECOM
Fresno, CA
- $80,000 to $140,000 USD / year
The Construction Engineer will support the California High-Speed Rail program by contributing to engineering analysis, data management, and performance reporting. This role is suited for an…
Added 40 mins ago
A
Mid-Level Civil Construction Engineer (4 years experience required)
AECOM
Bakersfield, CA
- $80,000 to $140,000 USD / year
The Construction Engineer will support the California High-Speed Rail program by contributing to engineering analysis, data management, and performance reporting. This role is suited for an…
Added 40 mins ago
A
Mid-Level Civil Construction Engineer (4 years experience required)
AECOM
Sacramento, CA
- $80,000 to $140,000 USD / year
The Construction Engineer will support the California High-Speed Rail program by contributing to engineering analysis, data management, and performance reporting. This role is suited for an…
Added 40 mins ago
A
Civil Construction Engineer (2 years of experience required)
AECOM
Bakersfield, CA
- $80,000 to $120,000 USD / year
The Construction Engineer will support the California High-Speed Rail program by contributing to engineering analysis, data management, and performance reporting. This role is suited for an…
Added 40 mins ago
A
Civil Construction Engineer (2 years of experience required)
AECOM
Fresno, CA
- $80,000 to $120,000 USD / year
The Construction Engineer will support the California High-Speed Rail program by contributing to engineering analysis, data management, and performance reporting. This role is suited for an…
Added 40 mins ago
A
Civil Construction Engineer (2 years of experience required)
AECOM
Sacramento, CA
- $80,000 to $120,000 USD / year
The Construction Engineer will support the California High-Speed Rail program by contributing to engineering analysis, data management, and performance reporting. This role is suited for an…
Added 40 mins ago
Partner Solutions Engineer, gTech Ads Sellside, Global Exchange Platforms
Google
New York, NY
…external clients/partners. From concept design and testing to data analysis and support, you will oversee the technical execution and business operations of Google's online advertising…
Added 40 mins ago
Program Manager II, Software Quality Assurance and Testing, Platforms and Devices
Google
Mountain View, CA
…user-centered design to help users organize the health and wellness data, get insight from it, and take action toward their health goals. We do this with a suite of apps, services, and…
Added 40 mins ago
Data Center Electrical Engineer
Google
Bridgeport, CT
As a Data Center Services Electrical Engineer, you will play a crucial role in the field-level implementation and operational support of Google’s rapidly expanding data centers. You will be…
Added 40 mins ago
Hardware/Software Co-Design Engineer, Inference
Google
Sunnyvale, CA
…TPUs, Vertex AI for Google Cloud, Google Global Networking, Data Center operations, systems research, and much more.Individual pay is determined by factors including job-related skills,…

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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