Mid-Level Full-Stack Developer (Python + HTLM/JavaScript)

About the Role

We are looking for a Mid-Level Full-Stack Developer to join a fast-moving startup client building an AI-based product in the US healthcare. You’ll own features end-to-end: a FastAPI backend and server-rendered, dynamic HTML on the frontend.

This is a hands-on role for someone who ships. The team keeps processes light and bureaucracy minimal, and delivery expectations are high. AI-assisted development is central to how the team works, so the candidate needs a strong sense of AI coding. That means knowing how to use AI tools to move fast, and knowing when to question, refine, or reject what they produce.

At Vitamin Software , we partner with ambitious companies to build software that solves real-world problems. For this engagement, you’ll be embedded with a startup client working at the forefront of AI products.
What You’ll Do

- Build and maintain backend services and HTTP APIs in Python with FastAPI.

- Build interactive UI in server-rendered HTML: Jinja templates, HTMX, Alpine and Tailwind. The work is dynamic pages, not a heavy single-page app.

- Add LLM features through the existing model layer: prompts, structured output, failure cases, and an eval for each prompt you add or change.

- Use an AI coding tool every day, and review what it writes for correctness, security and fit with the code around it before it is committed.

- Design PostgreSQL tables and queries, including the ones that have to stay fast.

- Move slow or multi-step work onto the background worker, Temporal, instead of holding an HTTP request open.

- Work directly with founders and product and take a ticket from the written spec to something merged.

- Raise concerns early about scope, risk or a better approach, and come with a proposal.

Requirements

- 3–5 years of professional experience in full-stack or backend-leaning web development.

- A strong Python and FastAPI background is enough. The codebase is FastAPI.

- Solid JavaScript, HTML and CSS, including dynamic interfaces without a React-style frontend.

- You have used an LLM inside a product or your own workflow, and you can tell a good model response from a bad one.

- You use an AI coding assistant and you reject generated code that is wrong, insecure or larger than the change needs.

- You have used Linear or another issue tracker.

- You understand HTTP APIs, sessions, and how a multi-tenant web app keeps one customer’s data off another’s.

- You are comfortable with Git: branches, pull requests and reading a diff.

- English at B2 or better.

- You can work remotely, own a ticket, and ship without waiting to be told the next step.

Bonus (Nice-to-Have)

- Experience with HTMX, Alpine.js or Svelte.

- Experience with Temporal or another workflow engine (Celery, Airflow, Prefect).

- Familiarity with the Claude API or other model provider APIs.

- Previous experience on an early-stage or greenfield product.

Contract Details

- Type: Independent contractor (B2B)

- Location: Romania (remote)

- Commitment: Full-time

- Duration: Project-based with potential for ongoing collaboration

- Payment range: 25- 30 USD/ hour

The Recruiting Process

- HR discussion – 30 minutes

- Technical interview – 60 minutes

- Offer discussion – 30 minutes

Why You Should Be Excited

You’ll work on an AI product being built right now, with a team that moves fast and trusts its people. There’s little process between your work and production, and you’ll grow your skills in modern AI-assisted development alongside people who care about building things well.

At Vitamin Software , you’ll be part of a lean, close-knit international team where every voice counts, and every contribution is valued.

Apply today and help build what’s next in AI!
Salary: 25 - 30 USD/ hour
Originally posted on Himalayas