Founding Engineer (Python, TypeScript & React)

Contractor · Remote in LATAM · Full-time · North American Eastern Time (ET) hours

Our client is an early-stage company building software for analytical testing laboratories and other regulated industries. It is an industry that quietly touches billions of lives: the work inside it is slow, manual and consequential, and the decisions made every day deserve to be faster, more consistent, and easier to stand behind.

As a Founding Engineer, you will build the product end to end. It is one product deployed in more than one place: the company's cloud on AWS, a customer's own Microsoft Azure environment, and, for the most restricted sites, a machine with no internet access. You will own it from the server to the screen, working directly with the founders.

Responsibilities

• The engine: build containerized Python workers (FastAPI, NumPy, SciPy) that make the same decision on every machine, byte for byte.
• Instrument files: read the binary files laboratory instruments produce, and write the system's decisions back into them so the lab's own software still opens them.
• The review application: build it in TypeScript and React, with SVG and Canvas charting over large datasets, Web Workers for heavy parsing, and exports to ZIP, XLSX and PNG.
• New test methods: turn a new laboratory test into a working module with the founders, following a written playbook.
• Cloud infrastructure: run on AWS (S3, SQS, ECS Fargate, RDS, KMS) today, with the same containers deployable to Azure (Container Apps or AKS, Blob Storage, Key Vault, Azure Database for PostgreSQL).
• Customer-hosted deployments: package and release the application so it runs inside a customer's own cloud tenant, behind their firewall, with their data staying in their environment.
• Air-gapped deployments: run the same containers on a Linux or Windows server with no internet, including signed, versioned offline updates.
• The record: implement immutable storage, hash-chained audit events and ten-year retention in every environment.
• Multi-tenancy and security: own PostgreSQL row-level security, IAM, SSO and secrets management.
• Delivery: maintain Terraform, GitHub Actions CI/CD that blocks regressions, Playwright end-to-end tests, and monitoring and logging.

Tech Stack

• Backend: Python, FastAPI, NumPy, SciPy, SQLAlchemy
• Frontend: TypeScript, React, Vite, SVG, Canvas, Web Workers
• Data: PostgreSQL, S3 / Azure Blob Storage
• Containers: Docker, Docker Compose
• Cloud: AWS (S3, SQS, ECS Fargate, RDS, KMS, IAM) and Microsoft Azure (Container Apps / AKS, Blob Storage, Key Vault, Azure Database for PostgreSQL, Entra ID)
• Infrastructure and delivery: Terraform, GitHub, GitHub Actions
• Testing: pytest, Playwright
• Systems: Linux, Windows Server

Requirements

• Strong Python and strong TypeScript / React. You are at home on both sides, not visiting one of them.
• SQL and PostgreSQL well beyond basic CRUD.
• Hands-on experience with Docker and containerized deployment.
• Production experience on AWS, and working experience with Microsoft Azure or a willingness to get there quickly.
• Infrastructure as code with Terraform, and CI/CD pipelines in GitHub Actions.
• You care about exact numbers: you know why the same calculation can give different answers on two machines, and how to stop it.
• Comfortable taking apart a binary file format nobody documented.
• You have shipped software that runs in someone else's environment, not just your own cloud.
• You have built a data-heavy interface that stays fast, not a CRUD app with a chart library dropped in.
• You use AI coding tools hard (Cursor, Claude Code, Codex, etc.), and you are ruthless about reviewing what they write.

Nice to Have

• Signal processing, chromatography or other scientific data.
• Regulated software: audit trails, data integrity, validated systems.
• Azure and AWS in the same product.
• Air-gapped installs and Windows Server administration.

Who You Are

• A critical thinker who pushes back.
• Proactive: nobody is going to hand you a ticket.
• Wants ownership of the schema, the screen, the server and the alarm that wakes you up.
• Fast without being sloppy.
• Able to handle adversity.
• Comfortable talking with scientists and customers' IT teams, not just other engineers.
• Someone with the desire to be great.

Additional Information

• Working hours: North American Eastern Time (ET).
• Not required: a specific number of years of experience (what matters is whether you can do the work) or any degree or higher education.

What We Offer

• Competitive USD Compensation — Get paid in USD.
• 100% Remote Work — Work from anywhere in Latin America.
• Equipment Provided — We provide the equipment you need to do your best work.
• Paid Time Off — Enjoy 12 PTO days per year to rest, recharge, and take time for yourself.
• Local Public Holidays — Celebrate all official holidays in your country.
• Birthday Off — Enjoy your special day, on us!
• Career Growth Opportunities — Keep learning, developing your skills, and advancing your career.
• Recognition Program — Your contributions matter, and we make an effort to celebrate them.
• Paid Approved Leaves — Receive paid leave for eligible, approved absences, in accordance with company policies.