Backend Software Engineer

Backend Software Engineer

Location: San Francisco (Hybrid - in-office 3+ days/week in downtown SF)

About Billables AI

At Billables AI, we’re building an AI-powered SaaS platform to transform how professional service providers work, freeing them to focus on the most creative and high-value parts of their business. We build workflows that eliminate manual overhead – starting with automated billable time tracking for attorneys.

We sit close to the core of how our customers operate and generate revenue. The systems we build need to be reliable, scalable, and thoughtfully designed, and the features we deliver have real, day-to-day impact for our fast-growing customer base.

We’re a small, experienced team based in San Francisco. We move quickly, prioritize impact, and empower engineers to drive projects end-to-end.

About the role

We’re looking for a backend engineer to help build and scale the core systems behind our platform. You’ll work on problems from early ideas through production – shaping requirements, making technical decisions, and working cross-functionally to deliver the right outcomes. You’ll work closely with backend, frontend, and AI engineers, and collaborate with leadership, go-to-market, and customers directly.

You might be a senior engineer who’s worked in startups before, or someone earlier in your career who’s already shown you can get a lot done and take initiative in fast-moving environments. This role is a great fit if you like owning meaningful parts of a system and making pragmatic trade-offs to ship.

What you’ll work on

Design, build, and maintain backend services (Python, gRPC, Postgres, Redis)

Work across a service-oriented architecture and integrate with third-party systems

Own projects end-to-end: clarify requirements, propose solutions, implement, and iterate in production

Scale systems that ingest and process large volumes of activity data

Improve reliability, performance, and observability across services

Make thoughtful trade-offs between speed, quality, and scalability

Contribute to system architecture and long-term technical direction

Step outside your primary lane when needed – frontend, infrastructure, etc.

What we’re looking for

Strong track record of deploying and maintaining high-quality, production-ready code in a modern environment

Proficiency in Python and strong backend fundamentals (APIs, data modeling, system design)

Experience building and scaling distributed systems or microservice architectures

A high ownership mindset – you take responsibility for outcomes, not just code

Comfort moving quickly and making decisions without perfect information

Actively use AI tools (LLMs, copilots, etc.) as part of your day-to-day development workflow

Clear communicator who can engage with both technical and non-technical stakeholders

Experience in early-stage or fast-moving environments

Nice to have

Experience with gRPC or similar RPC frameworks

Experience with DevOps/infrastructure (Docker, IaC, CI/CD)

Experience working with AI/ML systems or integrating LLMs into products

Tech stack (not exhaustive)

Python, gRPC, Postgres, Redis, Azure, Docker

Why this role

You’ll work on systems that are central to how our customers run their business

You’ll have real ownership early – not just implementation work

You’ll be part of a small, collaborative team where your decisions meaningfully shape the product and architecture

How to apply

Ready to join our team at Billables.ai? Please send your resume to [email protected]. We look forward to hearing from you!

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