Andotechnologies

Senior Backend Engineer (Contract to Hire)

Latin & South America | Remote. Posted 3 months ago

The role

A Senior Backend Engineer will own the PostgreSQL data layer and Python/FastAPI services on AWS. You will build and harden infrastructure, design API contracts, and extend AI/ML capabilities.

What you will do

  • Design PostgreSQL schemas, indexes, and queries.
  • Own performance troubleshooting for high-write workloads.
  • Build, operate, and harden AWS infrastructure using Terraform.
  • Use AI agents as a core part of writing, testing, and shipping code.
  • Design, build, and scale backend services in Python/FastAPI.
  • Own REST/OpenAPI contracts shared across web and mobile apps.
  • Extend AI-assisted features using AWS Bedrock, Claude, and MCP integrations.
  • Collaborate with data/ML on forecasting pipelines.
  • Write and maintain pytest test suites and strengthen CI/CD gates.
  • Participate in architecture decisions, code review, and mentor other engineers.

Required qualifications

  • 5+ years of professional backend engineering experience, including production Python (FastAPI, Flask, or Django).
  • Strong PostgreSQL expertise in schema design, indexing, query optimization, and migrations.
  • Solid AWS experience building and operating services on Lambda, RDS, and/or App Runner.
  • Experience designing, versioning, and documenting REST APIs (OpenAPI/Swagger).
  • Comfortable with containerized local development (Docker / Docker Compose).
  • Startup mindset: self-starter who works well independently and with ambiguity.
  • Strong instincts for testing, code review, and pragmatic architecture trade-offs.
  • Excellent written communication.

Nice to have

  • Experience with ML/data tooling (Pandas, NumPy, time-series forecasting).
  • Experience integrating LLM APIs or agentic tooling (Claude, Bedrock, MCP) into production products.
  • Familiarity with Next.js/React/TypeScript.
  • Background in workforce management, scheduling, HR tech, or other vertical SaaS.
  • Prior experience at an early-stage startup.
  • Experience mentoring engineers or leading technical design for a small team.

About the company

Ando is building AI-native workforce infrastructure for the 80M hourly workers in the U.S. and hundreds of millions globally. It is a Seed-stage company backed by Slow Ventures.