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Added 1 min ago
Software Engineer (TS/SCI CI Poly Required)
Community Talent Partners
Alexandria, VA · Annapolis, MD · Aurora, CO · San Diego, CA
As a Software Engineer, you will join a high-performing agile team supporting secure enterprise systems. You will be involved in the full software development lifecycle, utilizing Scaled…
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
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…
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 3 mins ago
Backend Software Engineer ($10,000) - Washington, DC
Jobs Xchange
Washington, DC
Are you a backend software engineer with a passion for building the future of communication, even if you're not actively searching? Imagine contributing your expertise to a cutting-edge…
Added 3 mins ago
Senior Software Quality Engineer
Abbott Laboratories
Sylmar, CA
Evaluate verification and validation strategies, test coverage, traceability, and defect management activities to ensure requirements, risk controls, cybersecurity considerations, and…
Added 4 mins ago
Billing Engineer
Tailscale
Remote, United States
We’re seeking a highly skilled and motivated Software Engineer to join our growing team. You will work as part of the engineering team to:
Added 4 mins ago
Billing Engineer
Tailscale
Remote, United States
We’re seeking a highly skilled and motivated Software Engineer to join our growing team. You will work as part of the engineering team to:
Added 5 mins ago
UI
Test Engineer
Ulysses Inc.
San Francisco, CA
- $110,000 to $160,000 USD / year
We're hiring two Test Engineers to test Mako underwater vehicles, Leviathan surface systems, and the equipment that connects them. You'll establish performance and readiness for deployment,…
Added 5 mins ago
UI
Subsea Acoustics Engineer
Ulysses Inc.
San Francisco, CA
- $145,000 to $190,000 USD / year
…team is lean, hands-on, and fast - we prototype in the shop, test on the water, and ship. If you want to work at the frontier, there's no frontier bigger than the…
Added 5 mins ago
UI
PNT Software Engineer
Ulysses Inc.
San Francisco, CA
- $180,000 to $260,000 USD / year
…team is lean, hands-on, and fast - we prototype in the shop, test on the water, and ship. If you want to work at the frontier, there's no frontier bigger than the…
Added 5 mins ago
UI
Mechanical Engineer
Ulysses Inc.
San Francisco, CA
- $130,000 to $180,000 USD / year
…team is lean, hands-on, and fast - we prototype in the shop, test on the water, and ship. If you want to work at the frontier, there's no frontier bigger than the…
Added 5 mins ago
UI
Manufacturing Design Engineer
Ulysses Inc.
San Francisco, CA
- $130,000 to $180,000 USD / year
We're looking for a Manufacturing Engineer to build the tooling and test infrastructure that makes that possible - and "tooling" undersells it. A good part of what you build will be…
Added 5 mins ago
UI
Embedded Systems Engineer
Ulysses Inc.
San Francisco, CA
- $140,000 to $180,000 USD / year
…team is lean, hands-on, and fast - we prototype in the shop, test on the water, and ship. If you want to work at the frontier, there's no frontier bigger than the…
Added 5 mins ago
UI
Electronics Engineer
Ulysses Inc.
San Francisco, CA
- $135,000 to $180,000 USD / year
…team is lean, hands-on, and fast - we prototype in the shop, test on the water, and ship. If you want to work at the frontier, there's no frontier bigger than the…
Added 5 mins ago
GL
QA Automation Engineer (Founding Team)
Gradientflo Labs
San Francisco, CA
- $24,000 to $32,000 USD / year
As the founding QA Automation Engineer, you’ll design frameworks that validate not just code but also AI outputs. From traditional E2E flows to specialized agent evaluation pipelines,…
Added 5 mins ago
GL
Prompt Engineer (Founding Team)
Gradientflo Labs
San Francisco, CA
- $24,000 to $32,000 USD / year
…will design those “thought patterns.” As the founding Prompt Engineer, you’ll build a prompt library and evaluation system that ensures Vibecoderz produces consistent, safe, and…
Added 5 mins ago
GL
Head of Growth (Founding Team)
Gradientflo Labs
San Francisco, CA
- $24,000 to $32,000 USD / year
…and monetization levers. You know how to run growth like an engineer: structured, data-driven, and always…
Added 5 mins ago
GL
Full Stack Developer (Founding Team)
Gradientflo Labs
San Francisco, CA
- $40,000 to $60,000 USD / year
Added 5 mins ago
GL
DevOps Engineer (Founding Team)
Gradientflo Labs
San Francisco, CA
- $24,000 to $32,000 USD / year
As the founding DevOps engineer, you will design our CI/CD pipelines, observability stack, infra-as-code, and security posture from day zero. You’ll ensure that when a developer ships code,…
Added 5 mins ago
GL
Backend Developer (Founding Team)
Gradientflo Labs
San Francisco, CA
- $32,000 to $40,000 USD / year
Integrate Stripe test billing and SendGrid notifications.
Added 5 mins ago
GL
AI Engineer (Founding Engineer – AI)
Gradientflo Labs
San Francisco, CA
- $24,000 to $32,000 USD / year
You will be the intelligence architect of Vibecoderz. As the AI Engineer, you’ll design, implement, and optimize the multi-agent orchestration system that powers the TutorAgent,…
Added 6 mins ago
Site Reliability Engineer Internship
Metasys
Remote, United States
The Site Reliability Engineer (SRE) is responsible for the ultimate stability, performance, and scalability of our entire integrated supply chain e-commerce platform. You will apply…
Added 6 mins ago
DevSecOps Engineer Internship
Metasys
Remote, United States
The DevSecOps Engineer is responsible for automating, integrating, and enforcing security controls throughout the entire development lifecycle, from code commit to production deployment.…
Added 6 mins ago
DevOps Engineer Internship
Metasys
Remote, United States
The DevOps Engineer is responsible for automating, streamlining, and maintaining the infrastructure and deployment pipelines for our entire integrated platform. You'll ensure rapid,…

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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