Company Name: JIG-SAW US, Inc.

Job Details: Job detailsHere’s how the job details align with your profile.Paymissing preference$100,000 - $150,000 a yearJob typeFull-time 

Job Url: https://www.indeed.com/viewjob?cmp=JIG--SAW-US%2C-Inc.&t=Senior+Ai%2Fml+Engineer&jk=329bacd6a5b0ab54&q=javascript&xpse=SoAl67I3sYNKpxXqVZ0LbzkdCdPP&xfps=64b21c3f-bf37-4edc-b0fc-b562f50053a6&xkcb=SoBE67M3sYMs5JSNrx0JbzkdCdPP&vjs=3

Job Description: Who We Are
JIG-SAW operates 24/7 Operations Centers in Japan and Canada that proactively monitor systems, issue alerts, and deliver live incident response—keeping your web services and IoT environments secure and running smoothly.
JIG-SAW Inc. (Tokyo Stock Exchange: 3914)
Corporate site — https://jig-saw.com/en/NEQTO.ai — https://neqto.ai/
About the Role
Join us to build a game-changing, AI-driven IoT platform that ingests millions of sensor events, derives real-time insights, and powers mission-critical workflows for enterprise customers. As a Senior Backend Engineer, you’ll own core services end-to-end—from secure, multi-tenant APIs (auth, RBAC, billing) and high-throughput data ingestion (MQTT → time-series pipelines) to the reliability layer (observability, rate limiting, caching, retries, idempotency). You’ll shape data models across PostgreSQL + Prisma and MongoDB, define clear API contracts and performance SLAs with Frontend/AI teams, and raise the bar through testing, code reviews, and CI/CD. If you enjoy tackling hard performance problems, designing for scale, and turning ambiguous requirements into elegant systems, you’ll feel right at home here.
Application Requirements
 Education: Bachelor’s degree or higher in Computer Science (or closely related field) is required.
 Portfolio required: Please include links to your GitHub/GitLab, product sites, demos, or case studies. Applications without a portfolio will not be considered.
 Programming assessment: Candidates must pass a third-party programming service assessment as part of the screening process.

Required Skills

 Node.js 20 or later
 TypeScript 5
 Express 5
 Authentication/Authorization (JWT, OAuth2)
 PostgreSQL + Prisma 6
 MongoDB 6 or later

Nice-to-Have

 Generative AI (OpenAI, Anthropic Claude, Google Gemini), LangChain, agents, vector databases for RAG, prompt engineering
 WebSocket
 IoT (e.g., sensor/time-series pipelines, MQTT ingestion)
 REST API design (swagger-jsdoc + swagger-ui-express)

Experience Guideline

 5+ years of professional experience with Node.js, TypeScript, PostgreSQL, and MongoDB

Compensation & Benefits

 Competitive salary (market-based; location-dependent)
 Health, Dental, Vision insurance (U.S.)
 Paid Time Off (PTO): vacation, sick leave, company holidays
 Remote work

Job Type: Full-time
Pay: $100,000.00 - $150,000.00 per year
Benefits:

 Dental insurance
 Health insurance
 Paid time off
 Vision insurance

Education:

 Bachelor's (Required)

Experience:

 professional-level PostgreSQL: 5 years (Required)
 professional-level MongoDB: 5 years (Required)
 professional-level Node.js, TypeScript, Express: 5 years (Required)

Work Location: Remote