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AI Full Stack Engineer (Volunteer)
Solution Community
Remote, United States
Volunteer AI Full Stack Engineer (AI-Native / Rapid Development)
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Neural Electrode or Interface Fabrication and Characterization Engineer
Cahira Technologies
Boston, MA
We're hiring an engineer with strong background in designing, nano-fabricating and characterizing electrode/interface for neural electrical stimulation. Expertise in micro/nano-fabrication…
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Nanoelectronics Device Engineer
Cahira Technologies
Boston, MA
We're hiring a micro/nano-electronic device engineer with strong background in electronic device physics, semiconductor engineering and CMOS technology. You will be involved in developing…
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Micro-Nano Fabrication Engineer
Cahira Technologies
Boston, MA
We're hiring a micro/nano-electronic device engineer with strong background in electronic device physics and expertise in micro-nano fabrication skills. You will be involved in developing…
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AI/Machine Learning Engineer, Neuro-AI
Cahira Technologies
Boston, MA
Are you an exceptional AI/ML Engineer with a passion for transforming human capabilities and treating neurological diseases? Join Cahira Technologies, a groundbreaking neurotech startup…
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Senior Test Automation Engineer
HJ Staffing
Houston, TX
Our client’s Testing Automation Team is hiring a Senior Test Automation Engineer to help build and scale the automated testing backbone that keeps their software releases fast, stable, and…
Added 1 min ago
DA
ML Engineer - Robotics
Deccan AI
Mountain View, CA
- $160,000 to $320,000 USD / year
We’re looking for an ML Engineer – Robotics to design, train, and deploy intelligent models that power autonomous systems. You’ll work at the intersection of machine learning, control…
Added 1 min ago
DA
ML Engineer - Demand Geneneration / Research / Engineering
Deccan AI
Mountain View, CA
- $160,000 to $320,000 USD / year
We are looking for an ML Engineer – Demand Generation / Research / Engineering to build intelligent systems that leverage machine learning, data science, and AI to drive business growth and…
Added 1 min ago
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Founding Engineer - ML Research
Deccan AI
Mountain View, CA
- $160,000 to $320,000 USD / year
We’re looking for a Founding ML Research Engineer to help build and scale our AI research backbone from the ground up. This role sits at the intersection of applied machine learning and…
Added 1 min ago
Founding Engineer - Machine Learning
Deccan AI
Mountain View, CA
We’re looking for a Founding ML Engineer to build and scale core machine learning systems from the ground up. This is a hands-on role for someone who can move fast between experimentation…
Added 1 min ago
Sr. Manufacturing Execution Systems (MES) Engineer
Community Talent Partners
Raleigh, NC
Community Talent Partners is seeking an experienced Senior MES Engineer on behalf of a client in the industrial automation sector, based in Raleigh, North Carolina.
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Civil Engineer (Aviation)
Community Talent Partners
Cockeysville, MD
We are seeking a motivated Aviation Civil Engineer who is ready to take on increasing responsibilities in the design and management of landside civil engineering projects supporting…
Added 1 min ago
Software Engineer, Infrastructure (C++)
Fabri
Billerica, MA
We are looking for a Software Engineer, Infrastructure (C++) to build the software systems that connect Fabri's digital manufacturing process end-to-end.
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F
Software Engineer, Generalist (C++/Python)
Fabri
Billerica, MA · Boston, MA
- $140,000 to $180,000 USD / year
We are looking for a Software Engineer, Generalist to build the software systems that connect Fabri’s digital manufacturing process end-to-end.
Added 1 min ago
Software Engineer, Applied ML
Fabri
Billerica, MA
We are looking for a Software Engineer, Applied ML to build the software systems that connect Fabri's digital manufacturing process end-to-end.
Added 1 min ago
Senior Mechanical Engineer
Fabri
Billerica, MA
Fabri is seeking a Senior Mechanical Engineer to architect, design, and deliver the in-house equipment and infrastructure that defines our manufacturing processes. This is a foundational…
Added 1 min ago
F
Senior Foundry Engineer
Fabri
Boston, MA · Billerica, MA
- $115,000 to $140,000 USD / year
Fabri is seeking a Senior Foundry Engineer to build and own the process development of high-performance superalloy castings for demanding aerospace and space-industry applications. This…
Added 1 min ago
Principal Systems Engineer
Fabri
Boston, MA
Fabri is seeking a Principal Systems Engineer to architect, design, and deliver the in-house equipment and infrastructure that defines our manufacturing processes. This is a foundational…
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F
Operations Engineer
Fabri
Billerica, MA
- $120,000 to $130,000 USD / year
Fabri is seeking a hands-on Operations Engineer to join our fast-growing foundry team.
Added 1 min ago
Metallurgical Process Engineer
Fabri
Billerica, MA · Boston, MA
Fabri is seeking a Metallurgical Process Engineer to build and own the solidification science behind high-performance investment castings for demanding aerospace and space-industry…
Added 1 min ago
Mechanical Engineer
Fabri
Billerica, MA
Fabri is seeking a Mechanical Engineer to design and build the equipment that powers every step of our casting process. You will own mechanical systems from concept to commissioned…
Added 1 min ago
Sr. SDE, AWS Agentic WorkSpaces - Forefront (Agentic Harness)
Amazon.com Services LLC
Seattle, WA
…into our consoles and SDK. As a Senior Software Development Engineer you will be a key contributor to our agentic harness - the always-on platform layer that hosts our LLM agents: the agent…
Added 2 mins ago
Software Engineer, XR Developer
Aether
Remote, United States
We're looking for a sharp, ambitious Frontend Engineer with strong CAD / 3D skills to take ownership of key parts of our in-browser solar configurator - a Three.js-powered design engine…
Added 2 mins ago
Software Engineer, Three.js
Aether
Remote, United States
We're looking for a sharp, ambitious Frontend Engineer with strong CAD / 3D skills to take ownership of key parts of our in-browser solar configurator - a Three.js-powered design engine…
Added 2 mins ago
Senior CAD Engineer (Remote)
Aether
Remote, United States
We're looking for a sharp, ambitious Frontend Engineer with strong CAD / 3D skills to take ownership of key parts of our in-browser solar configurator - a Three.js-powered design engine…

Gradientflo Labs

Backend Developer (Founding Team)

San Francisco, CA, United States

$32,000 to $40,000 USD / year

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Job details

Pay: $32,000 to $40,000 USD / year
Experience: 10+ years backend engineering experience (Python, REST/async).
Posting language: English

Original job description

Role Overview You will own Vibecoderz’ engine room. Every interaction the TutorAgent orchestrates, every artifact generated, every certification issued - it all runs through your services. From Firestore schemas to FastAPI microservices and background workflows, you’ll design and build the backbone that powers Superficient Learning for developers worldwide. This role goes beyond writing APIs - you will define system contracts, data models, and scalability patterns that allow Vibecoderz to serve 100K+ concurrent learners with sub-100ms latency. You’ll work in lockstep with FE, AI, Prompt, and DevOps to ensure the platform’s foundation is secure, performant, and future-proof. You’ll use Linear for sprints, Notion for PRDs, and GitHub for repos, collaborating across the team to make backend decisions visible, reproducible, and accountable.

Key Responsibilities

Service Architecture & APIs - Design, build, and maintain FastAPI microservices with clean modular boundaries.
Data Modeling & Schemas - Define Firestore schemas for users, courses, artifacts, results, and certifications. Manage Neo4j Developer Graph integration.
Asynchronous Workflows - Implement Cloud Tasks + Cloud Workflows for long-running jobs (certificate generation, artifact rendering, learner graph updates).
Commercial Layer - Integrate Stripe (subscriptions) and SendGrid (transactional email) via Firebase extensions. Ensure compliance with billing and audit standards.
Performance & Scale - Optimize services for high throughput with async I/O. Achieve <100ms API response time under load.
API Gateway & Security - Expose services through GCP API Gateway with JWT verification, rate limiting, and role-based access.
CI/CD Pipelines - Collaborate with DevOps to maintain GitHub Actions pipelines for automated testing, containerization, and deployment to Cloud Run.
Testing & Reliability - Write integration tests, contract tests, and load tests. Ensure regression-free releases.
Monitoring & Observability - Instrument services with OpenTelemetry for distributed tracing, logging, and metrics. Ensure failures are detectable and recoverable.
Cross-Team Collaboration - Work closely with PM to refine PRDs in Notion, track sprint execution in Linear, and align with AI/FE on contract stability.
Problem Solving - Anticipate bottlenecks (data modeling, latency, scaling) and propose architectural solutions.

Success Metrics

90 Days (Probation):

Deploy FastAPI → Cloud Run service with API Gateway routing.
Ship Firestore schema for Developer Graph (MVP).
Integrate Stripe test billing and SendGrid notifications.

12 Months:

Scale backend to handle 100K+ concurrent learners.
Maintain 99.9% uptime with zero Sev1 backend-originated outages.
Optimize p95 API response time <100ms under production load.
CI/CD coverage >90% with automated regression tests.

Must-Haves

10+ years backend engineering experience (Python, REST/async).
Deep expertise in distributed systems, scalable APIs, and async I/O.
Hands-on GCP experience (Cloud Run, Firestore, Pub/Sub, API Gateway).
Proven delivery of high-scale backend systems in product companies.

Nice-to-Haves

Experience with Neo4j Graph DB.
Prior work on AI product integrations (LLM orchestration, eval pipelines).
Knowledge of Pub/Sub patterns for agentic systems.
Startup or founding engineer background.

Tech Stack Visibility

Core Services: FastAPI, Python Async, Google Cloud Run
Routing & Security: Google Cloud API Gateway, Firebase Auth
Data: Firestore, Neo4j Aura (Developer Graph), Redis
Workflows: Cloud Tasks, Cloud Workflows
Commercial: Stripe (Firebase Extension), SendGrid (Firebase Extension)
CI/CD: GitHub Actions, Docker
Observability: OpenTelemetry, Google Cloud Trace
Tools: Linear (execution), Notion (PRDs), GitHub (repos)

Assessment Objective: Validate ability to build scalable FastAPI backend services with async workflows and integrations.

Challenge (Candidate PoC):

Build a FastAPI backend powering an AI Tutor mock system with:

/generate-course endpoint → Input: “Teach me React Hooks.” Output: structured course outline (JSON).
/generate-artifact endpoint → Generates quiz or slide deck JSON artifact.
/generate-miniapp endpoint → Returns runnable JS snippet.
Store all results in Firestore (schemas for userId, courseId, artifactId).
Trigger Cloud Task for certificate generation (mock PDF).
Fire Firestore trigger → Send transactional email via SendGrid extension.
Secure endpoints with Firebase JWT verification through API Gateway.

Deliverables:

FastAPI app deployed on Cloud Run.
Firestore schema + example populated data.
Postman collection for API requests.
GitHub repo with modular code + CI pipeline.
Short Loom walkthrough demo.

Evaluation Criteria:

Service Architecture & Code Quality (30%)
Data Modeling & Schema Design (20%)
Async Workflow & Cloud Task Integration (20%)
API Security & Performance (15%)
Documentation & Testing (15%)

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