Jobs in the United States

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Added 3 mins ago
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Elasticsearch Engineer *No C2C*
TEKsystems
Lincoln, MA
- $120,000 to $250,000 USD / year
Experience with log ingestion pipeline design, including parsing, enrichment, and normalization across heterogeneous log sources such as network, endpoint, identity, and cloud
Added 3 mins ago
IG
Cyber ISSE - Secret
Insight Global
Lincoln, MA
- $60 to $70 USD / hour
A federal client is seeking a Cyber Security Engineer support all aspects of acquisition, system engineering reviews, and milestone entrance/exit criteria in Lexington, MA. Responsibilities…
Added 3 mins ago
Manufacturing Engineer III
General Atomics
Acton, MA
We have an exciting opportunity for an Optical Payload Manufacturing Engineer to join our team in Acton, MA!
Added 3 mins 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 3 mins ago
Senior Technical Engineering Leader - Guidewire PolicyCenter & Policy Lifecycle
MAPFRE Insurance
Webster, MA
…This role will be instrumental in driving the architecture, design, development, and modernization of critical policy administration capabilities that support product configuration,…
Added 3 mins ago
Product Definition Engineer - Designer
GE Aerospace
Lynn, MA
The PDE Designer supports the engineering function to perform the design, test, or integration required to define and support assigned components, assemblies or systems that meet business…
Added 3 mins ago
Staff Quality Systems Engineer
J&J Family of Companies
Danvers, MA
We are searching for the best talent for a Staff Quality Systems Engineer to lead and optimize CAPA and Nonconformance (NC) processes within a regulated medical device environment. This…
Added 3 mins ago
QA Engineer- INDIA
Insight Global
Westborough, MA
We are looking for a strong QA Engineer to join our team! This role is responsible for supporting the Test Engineering team in the planning, development, and maintenance of a comprehensive…
Added 3 mins ago
SDE II, Perception and SLAM, Autonomous Mobility
Amazon
North Reading, MA
…robot. We are looking for an enthusiastic Software Development Engineer to join our perception, localization, and machine learning team. You will be part of an exceptional group of…
Added 3 mins ago
RF Product Test Engineer
Insight Global
North Reading, MA
Seeking an RF-focused Product Verification Engineer to develop automated test solutions, validate RF instrumentation products, design test hardware, and troubleshoot integration issues.…
Added 3 mins ago
Quality Assurance Engineer
Zoll Medical Corporation
Chelmsford, MA
The Product Quality Assurance Engineer supports product quality throughout the product lifecycle, with a focus on complaint investigations, risk management support, and product quality…
Added 3 mins ago
Senior Supplier Quality Engineer
Zoll Medical Corporation
Chelmsford, MA
…to be a part of ZOLL!Job SummaryThe Senior Supplier Quality Engineer will be a leader on the Supplier Quality team, expected to be subject matter expert with regard to Supplier Quality…
Added 3 mins ago
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Electrical Engineer
Pfizer
Andover, MA
- $82,700 to $137,900 USD / year
…improving patients' lives. Whether you are involved in the design and development of manufacturing processes or supporting the upkeep of critical systems, engineering is crucial to ensuring…
Added 3 mins ago
Senior Frontend Engineer - Hashicorp Vault
IBM
LOWELL, MA
…work with diverse technologies, partners, and industries to design, develop, and deliver solutions that power digital transformation. With a culture that values innovation, growth, and…
Added 3 mins ago
Senior Product Security Engineer
IBM
LOWELL, MA
The Secure Lifecycle Management (SLM) organization is seeking a Product Security Engineer to partner closely with the engineering teams responsible for HashiCorp Vault, Boundary, and Radar.…
Added 3 mins ago
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Software Engineer II
Insight Global
Marlborough, MA
- $70 to $75 USD / hour
Insight Global is seeking a Software Engineer II for a top medical technology client. This candidate will join a growing team supporting the development of an innovative digital diagnostics…
Added 3 mins ago
Staff Engineer - Software Engineering
Capital One
Cambridge, MA
As a Staff Engineer at Capital One, you will be a part of a community of technical experts working to define the future of banking in the cloud.
Added 4 mins ago
Senior Quality Engineer
Medtronic
Boxborough, MA · Boston, MA
The Senior Quality Engineer serves as a quality representative supporting manufacturing operations, process improvements, product quality initiatives, and regulatory compliance activities.…
Added 4 mins ago
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Network Infrastructure Engineer II
Akamai Technologies, Inc.
Boston, MA
- $83,200 to $149,800 USD / year
As a Network Infrastructure Engineer II, you will oversee operations in our global data centers. You will monitor and maintain our data centers, networks, and servers worldwide. You will…
Added 4 mins ago
Senior Ellucian Technical and Integrations Engineer
State of Massachusetts
Boston, MA
Added 4 mins ago
Senior Network Engineer
Cognizant
Boston, MA
Cognizant is seeking a Senior Network Engineer to design, implement, secure, operate, and optimize enterprise datacenter, campus, branch, wireless, and hybrid-cloud networks. This role…
Added 4 mins ago
Software Engineer II
Amentum
Boston, MA
The Software Engineer II will perform full stack development with C# program, ReactJS, MVC, Linq, and rest API development in NET Core platform. This position is US remote teleworking…
Added 4 mins ago
Senior Design Manager (Data Center)
Jacobs
Boston, MA
…high-performance computing infrastructure. We are seeking a Senior Design Manager - AI Data Center White Space Design to provide technical leadership for the planning, design, construction,…
Added 4 mins ago
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Senior Program Manager & Key Client Lead, Data Centers
Ramboll Americas Engineering Solutions, Inc.
Boston, MA
- $150,000 to $225,000 USD / year
…from early site and power strategy through interconnection, design, and construction support? This role combines program delivery with executive client engagement and measurable growth…
Added 4 mins ago
AI Automation Architect - Manufacturing and MES processes- Remote
Cognizant
Boston, MA
…fundamentally connect people with processes. Within Cognizant IOT, we engineer industry-aligned, IoT-enabled products that merge industry needs with human drivers. Our intelligent products…

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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