Senior Software Engineer, Backend Remote, Massachusetts

Infinityy; Northern (KY); Hybrid; USD 130,000 - 190,000; Full time

Benefits offered by this job

Competitive compensation

Flexible remote/hybrid

Medical benefits

Unlimited PTO

Shape product & engineering culture

High autonomy

Job summary

Infinityy is reshaping real estate with an AI-powered, highly scalable backend platform. We seek a Senior Backend Software Engineer to architect core systems powering our discovery platform and AI-driven UX.

You will collaborate across product, design, and AI/ML teams, own backend services, and drive rapid iteration in a fast-paced, seed-stage environment. You will build reliable APIs, scale services on cloud platforms, and mentor peers while shaping engineering culture.

Qualifications

• 5+ years of professional backend development experience.
• Experience with AI coding agents and developer tools in daily workflow.
• Strong proficiency in C#/.NET and production-grade APIs/services.

Responsibilities

• Design, build, and maintain backend services and APIs powering Infinityy’s platform and AI features.
• Architect scalable solutions in C#/.NET, integrating SQL and NoSQL data stores.
• Develop cloud-native services on Azure or AWS with Functions, Data Factory, Service Bus, Event Grid, Lambda.
• Collaborate with AI teams to integrate LLMs and agentic frameworks.
• Own data pipelines, event-driven systems, and background processing workloads.
• Build for reliability, observability, resilience, and security.
• Contribute to DevOps, CI/CD, release automation, and infra management.
• Mentor engineers and contribute to engineering culture and practices.

Skills

C#/.NET

APIs & microservices

Azure/AWS

SQL Server

MongoDB

Distributed systems

AI coding agents

Observability/DevOps

LangChain

Tools

Azure

AWS

Job description

Infinityy is the most advanced property technology platform transforming the way real estate is marketed, experienced, and sold. Our AI-powered assistant conducts interactive tours, answers questions in over 70 languages, and captures valuable insights 24/7—empowering real estate professionals to engage buyers anytime, from anywhere. Infinityy creates collaborative virtual environments where prospects can explore properties alongside agents, friends, and family in real time, making the homebuying journey more informed and connected.

We are a company founded on the belief that modern AI isn’t just a feature—it’s a force multiplier for the entire business. From engineering to operations to customer experience, we leverage the most advanced AI tools and coding agents to accelerate development, enhance quality, and deliver value faster. Every team member works in an environment where AI is deeply integrated into daily workflows, enabling rapid iteration and high autonomy.

As a seed-stage startup, we move quickly, iterate constantly, and rely on team members who thrive in ownership-driven, fast-paced environments. If you want to build the future of real estate using cutting-edge technology, Infinityy is the place to do it.

Your Role

We are looking for a Senior Backend Software Engineer who will help architect and build the core backend systems powering our real estate discovery platform and AI-driven user experience. You will work closely with product, design, and AI/ML teams to shape the platform’s foundation, scale our services, and ensure reliability and performance. This is a hands-on role ideal for someone who enjoys early-stage ownership, greenfield software architecture, and building flexible systems that support rapid iteration.

What You’ll Do:

• Design, build, and maintain backend services and APIs supporting Infinityy’s core platform and AI-driven features
• Architect scalable solutions in C#/.NET, integrating with both SQL and NoSQL data stores (Microsoft SQL Server, MongoDB, etc.)
• Develop cloud-native services and workflows on Azure or AWS, leveraging tools such as Functions, Data Factory, Service Bus, Event Grid, Lambda, or equivalent
• Collaborate with the AI team to integrate LLMs and agentic frameworks (LangChain, LangGraph, Haystack, CrewAI, AutoGen, AI Foundry)
• Own the design and execution of data pipelines, event-driven systems, and background processing workloads
• Build for reliability, observability, resilience, and strong security practices
• Contribute to DevOps workflows, CI/CD pipelines, release automation, and infrastructure management
• Mentor other engineers and shape engineering best practices and culture
• Participate in product discussions, roadmap planning, and feature scoping—your voice will matter

Required Qualifications:

• 5+ years of professional backend software development experience.
• Recent, real-world experience using AI coding agents and developer tools, such as Claude Code, GitHub Copilot, Cursor, or similar, as part of your day-to-day engineering workflow.
• Strong proficiency in C#/.NET and building production-grade APIs and services.
• Hands-on experience with relational and NoSQL databases (SQL Server, PostgreSQL, MongoDB, etc.).
• Experience building and deploying applications on Azure or AWS.
• Familiarity with cloud-native tools (Functions/Lambda, Service Bus/SQS, Event Grid/EventBridge, Data Factory/Glue).
• Solid understanding of distributed systems, system design, and event-driven architecture.
• Strong sense of ownership and comfort working in a fast-paced, seed-stage environment.
• Excellent communication skills and ability to collaborate across disciplines
• Experience with Typescript or Python (preferred)
• Experience integrating AI systems, LLMs, embeddings, RAG pipelines, or agentic frameworks (e.g., LangChain, LangGraph, Haystack, CrewAI, AutoGen, AI Foundry) (preferred)
• DevOps or platform engineering experience (CI/CD, containerization, monitoring, observability) (preferred)
• Prior experience in early-stage startups (preferred)
• Passion for proptech, real estate technology, or building consumer-facing digital experiences (preferred)

What We Offer:

• Competitive compensation
• A flexible remote/hybrid work environment
• Medical benefits
• Unlimited PTO
• Ability to shape a product and engineering culture from the ground up
• High autonomy, trust, and impact
• A mission-driven team focused on transforming real estate through technology

We are committed to a diverse, equitable, and inclusive professional environment. We encourage individuals of all backgrounds to apply, and value each team members’ unique perspectives, recognizing they make our team stronger!

Infinityy is proud to be an Equal Opportunity Employer and all qualified candidates will receive consideration for employment, regardless of race, color, religion, sex, sexual orientation, gender identity, national origin, disability or veteran status.