Senior Backend Engineer (Python/AI)

Job description

Overview

Senior Backend Engineer (Python / GenAI) – Remote in LATAM (Mexico, Costa Rica, Colombia, Argentina, Peru, El Salvador, Dominican Republic).

At Tech9, we are driven by a clear vision—to empower organizations with AI-centered solutions that make them more adaptable, efficient, and future-ready.

As a company at the forefront of innovation, we help our clients build exceptional software that not only meets today’s needs but anticipates tomorrow's challenges.

Our approach blends cutting-edge AI technology, top-tier talent acquisition, and expert project management to ensure that businesses can scale effectively and deliver high-quality, world-class software on time and within budget.

Our partnerships speak volumes, with clients like Instructure, Young Living, Imagine Learning, Mars Corp., and many others trusting us to lead the way in software development.

We are rapidly growing across our offices in the US, LATAM, and India, and we're creating an environment where talented individuals can thrive, collaborate, and have fun while building transformative solutions.

If you're excited by the opportunity to work in a fast-paced, innovative environment where scaling and building the future of software is key, we’d love to hear from you.

Join us as we work together to redefine the world of software development!

Role Overview

We’re working with a company that builds AI-powered training simulations to help people improve real-world skills like leadership, communication, and decision-making.

Their platform is used by organizations in education, healthcare, and business to create safe, realistic environments where employees can practice important human skills.

To power these simulations, the company combines real-time audio/video, digital avatars, and AI, all running on a fast-moving backend infrastructure.

That’s where this role comes in.

We’re hiring a Senior Backend Engineer (Python/GenAI) to build the backend systems that make real-time AI experiences possible.

You won’t be building AI models yourself—but you’ll work alongside the AI team to develop the services and infrastructure that allow those models to be deployed, scaled, and used in live environments.

This is a driver role—you’ll be expected to bring new ideas, help shape processes, and take initiative in solving problems, not just wait for tasks to be assigned.

You’ll be part of a lean, startup-style AI team, where everyone contributes across a wide range of projects.

You won’t be siloed into just one product or feature—your work will span across multiple high-impact initiatives.

Your work will focus on:

• Developing backend services in Python that support real-time communication using LiveKit and WebSockets
• Building systems that make it easy to deploy, monitor, and scale AI features
• Working with AWS (EC2) and Kubernetes to ensure performance and reliability
• Creating tools and infrastructure that unblock AI engineers, allowing them to move faster
• Contributing to a platform used in live, multi-user environments where low-latency and high stability are critical

For context, here’s a snapshot of the broader tech stack used by our client team.

While you’re not expected to know all of these, you’ll interface with many of them:

• Python for backend services
• LiveKit for real-time audio/video streaming
• WebRTC and WebSockets for low-latency communication
• Unity to drive avatar simulations
• AWS Lambda, EC2, and Kubernetes for deployment and scaling
• Datadog for system monitoring
• LangChain and LangFuse for AI integration and observability

If you’re excited about being the software engineering expert on a high-performing AI team, this is a rare opportunity to apply your backend and systems knowledge to shape how cutting-edge AI is deployed and scaled in the real world.

You’ll use your core computer science and software engineering skills to build the infrastructure that makes AI work—fast, reliably, and at scale.

What You Need to Have

• 5+ years of experience in backend or full-stack software engineering, with a strong focus on Python
• Deep experience with real-time systems, including WebRTC, LiveKit, or similar live streaming platforms
• Experience with live, low-latency AI interactions
• Experience in scaling backend services, especially in distributed, production environments
• Proficiency with AWS (EC2, ECS, Lambda, etc.) and Kubernetes for orchestrating cloud-native services
• Expertise in debugging, logging, and performance optimization in production
• Solid experience with Docker and CI/CD pipelines
• Familiarity with deploying AI models into production environments and working alongside AI teams
• Experience with frameworks such as LangChain, LangFuse, Ray, and LLMOps tooling

Nice to Have

• Experience with LiveAgent-style integrations to power human-in-the-loop systems
• Background in LMS, streaming, or high-concurrency platforms
• Familiarity with event-driven architecture and asynchronous Python frameworks (e.g., FastAPI, asyncio)

Interview Process

Our interview process is designed to be efficient, respectful of your schedule, and never burdensome.

Each step has a purpose, and we use research-backed best practices to identify top-tier talent without wasting your time.

We aim to complete the process within 2–3 weeks, with 1–2 business days to respond after each step.

This role is targeted to start on October 13th or October 20th.

Interview Plan:

• Interview 1: (On-Demand HireVue) – 30 minutes
• Recruiter Q&A (not an interview) – 10–15 minutes
• Round 1: Internal Technical Round with Tech9 Team and Engineering Manager – 60–75 minutes
• Round 2: Technical Interview with Client – 90–120 minutes (two parts: take-home 30–60 minutes, then live session)
• Round 3: Culture Fit Interview with Client CTO – 30 minutes

Final Steps: We aim to finalize decisions and extend offers within a few business days after the final interview, with a rapid 1–2 business day cadence between steps.

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Required Skill Profession

Redes Y Sistemas