Posh · 5 hours ago
Senior Software Engineer, Backend (AI)
NYC Metro Area
Full-time
Hybrid
Mid, Senior Level
3+ years expPosh is a company focused on fostering human connections through its community-building platform. They are seeking a Senior Backend Engineer to join their AI R&D team, where the role involves designing and implementing scalable backend systems and AI features to enhance user experiences.
Consumer SoftwareEvent ManagementTicketing
Responsibilities
Build and Scale AI Services: Design, build, and maintain scalable backend services and APIs for AI-powered features, writing primary production code in Python
Architect Multi-Agent Systems: Move beyond standard RAG to design and implement complex, hierarchical Multi-Agent Systems that can perform sophisticated, multi-step tasks
Implement Evaluation and Fine-Tuning: Build robust frameworks to evaluate the quality of AI systems and manage fine-tuning pipelines to continuously improve model performance
Own Cloud Infrastructure with IaC: Define, deploy, and manage our AI infrastructure using Terraform. You'll be responsible for scaling our container-based serverless solutions while ensuring reliability and performance
Optimize for Efficiency: Deeply analyze the tradeoffs between model performance, latency, and cost to make pragmatic, business-aware technical decisions when using managed AI services
Integrate Across the Stack: Collaborate with our core engineering teams by occasionally working in TypeScript (Node.js) to integrate AI features into our main application
Qualification
Required
3–6+ years of backend or full-stack engineering experience, with a proven track record of shipping high-quality, scalable systems in fast-paced environments
Deep expertise in Python and its ecosystem for web services and data processing
Strong experience with Infrastructure as Code (Terraform), a major cloud platform (e.g., GCP, AWS, Azure), and deploying containerized applications
A passion for shaping 0→1 products in a lean, fast-paced R&D environment where you'll help define new playbooks for AI-native experiences
Preferred
Pragmatic AI/ML Exposure: Familiarity with managed AI services (e.g., Vertex AI, AWS Bedrock), working with LLMs, or building advanced AI systems is a plus
Experience with model evaluation frameworks (e.g., RAGAs, LangSmith, DeepEval) or fine-tuning is helpful but not required
The ability to think about tradeoffs between cost, latency, and performance is valuable
Experience with open-source agentic frameworks (e.g., LangGraph, CrewAI, Strands, etc) is a plus
Experience with MLOps, data engineering, or a background in consumer, marketplace, or event-driven platforms
Company
Posh
Create and discover events. Find your world.
51-200 employees
H1B Sponsorship
Posh has a track record of offering H1B sponsorships. Please note that this does not
guarantee sponsorship for this specific role. Below presents additional info for your
reference. (Data Powered by US Department of Labor)
Distribution of Different Job Fields Receiving Sponsorship
Represents job field similar to this job
Trends of Total Sponsorships
2025 (1)
Funding
Current Stage
Growth StageTotal Funding
$66.84MKey Investors
Goodwater CapitalCompanyon Ventures,EPIC VenturesPareto Holdings
2025-12-30Undisclosed· $35.81M
2024-07-23Series A· $22M
2023-12-12Undisclosed· $4M
Leadership Team
Eli Taylor-Lemire
Co-Founder / Chief Technology Officer
Varun Goel
Strategic Partner, Seed Investor
Recent News
alleywatch.com
2026-01-14
Business Insider
2025-10-15
Company data provided by crunchbase