Senior Backend Engineer

Job Title: Senior Backend Engineer - Python / AI / LLMs

Location: Remote (U.S. preferred)

Employment Type: Full-time

Salary: $120,000 - $180,000 + equity

Benefits: Competitive healthcare, flexible PTO, remote-first culture, home office stipend, wellness allowance, learning & development budget

About Us

We're a fast-moving startup on a mission to build AI-powered tools that make complex work simple, faster, and more intelligent. We leverage cutting-edge large language models (LLMs) to solve real problems across industries. Our team is small, senior, and passionate about what we build-every line of code makes a visible impact.

We're looking for a Senior Backend Engineer to join us in scaling the backend infrastructure that powers our AI systems.

What You'll Do

Design, build, and maintain backend services and APIs using Python (FastAPI, Flask, or Django)

Integrate and serve LLMs (e.g., OpenAI, Anthropic, Hugging Face, or open-source models) in production

Collaborate with ML engineers and product teams to deliver intelligent, scalable features

Build and optimize data pipelines for inference, prompt processing, and model fine-tuning

Architect systems that balance performance, security, and maintainability

Own projects end-to-end-from architecture and implementation to testing and monitoring

What We're Looking For

5+ years of backend software development experience

Strong proficiency with Python and cloud infrastructure (AWS, GCP, or similar)

Experience deploying and working with LLMs in real-world products

Deep understanding of RESTful APIs, asynchronous programming, and containerized services (Docker, Kubernetes)

Familiarity with data pipeline tools and task queues (Airflow, Celery, etc.)

Product mindset-you think beyond code and care about usability, performance, and impact

Bonus Skills (Not Required but Nice to Have)

Experience with FastAPI

Familiarity with vector databases (Pinecone, Weaviate, FAISS)

Prompt engineering or fine-tuning experience with LLMs

Background in NLP, search, or applied ML

Experience building dev tools, SaaS, or productivity platforms

Why You'll Love Working Here

Competitive salary ($120K-$180K) + meaningful equity

Fully remote, flexible work environment

Comprehensive health, dental, and vision insurance

Wellness, L&D, and home office stipends

Work on cutting-edge AI systems that ship to real users

Smart, low-ego team that values impact over bureaucracy

Oscar Associates Limited (US) is acting as an Employment Agency in relation to this vacancy.