Senior Back-End Engineer (Python)

Cornerstone Global Partners (CGP Group); Colombia; Remote; COP 381,959,000 - 572,938,000; Full time

Job summary

Cornerstone Global Partners (CGP Group) seeks a Senior Back-End Engineer based in Colombia for a fully remote role. You will own microservices, data pipelines, and the agents stack, turning raw data into structured records and search indices powering the platform.

You’ll work in a small team driving architecture decisions, shipping independently, and collaborating across AWS, Elasticsearch/OpenSearch, and GraphQL integrations.

Qualifications

• Production-grade Python and FastAPI experience.
• Experience building pipelines for large semi-structured data.
• Experience with Elasticsearch/OpenSearch index design and optimization.
• Practical GraphQL experience and cross-service API contracts.
• Strong AWS knowledge and containerized deployments.

Responsibilities

• Design and operate high-throughput data pipelines in Python (FastAPI) handling large-scale data feeds.
• Build extraction, parsing, and enrichment workflows turning raw files into structured records.
• Design and maintain Elasticsearch/OpenSearch indices and optimize bulk ingestions.
• Develop agent runtimes and tool-calling interfaces with state and persistence.
• Integrate with GraphQL APIs and external vendor APIs with robust error handling.
• Build resilient event-driven systems on AWS with retries and dead-letter handling.
• Profile and debug live pipelines to maintain speed and reliability.

Skills

Python

FastAPI

Async services

Data pipelines

Elasticsearch

AWS

GraphQL

PostgreSQL/SQLAlchemy

Tools

Elasticsearch/OpenSearch

GraphQL

AWS

PostgreSQL

SQLAlchemy

Kafka

Job description

Colombia (Remote) | Full-time | 1 Opening

Build the data and AI backbone of a platform at scale, with real ownership and fully remote from Colombia.

About Our Client

Our client is an AI-powered enterprise platform that automates end-to-end recruitment and workflow orchestration. Their platform runs at production scale, coordinating complex third-party integrations, processing large volumes of unstructured data, and running real-time, event-driven pipelines across multiple systems.

THE OPPORTUNITY

We're looking for a Senior Back-End Engineer, based in Colombia and working fully remote, to own microservices, data pipelines, and the agents stack. You'll build systems that take large volumes of raw, semi-structured, and unstructured data and turn them into clean structured records and search indices that power agent workflows and the core platform. You'll join a small, high-ownership team where engineers drive decisions from pipeline architecture to cloud infrastructure, design systems together, and ship independently without heavy process.

What You'll Do

• Design and operate high-throughput data pipelines in Python (FastAPI) that ingest, validate, and normalize large-scale data feeds
• Build extraction, parsing, and enrichment workflows that turn raw files into structured, searchable records
• Design and maintain Elasticsearch / OpenSearch indices, from schema design to bulk ingestion and retrieval optimization
• Develop agent execution runtimes and tool-calling interfaces, including state, context limits, persistence, and streaming
• Integrate with GraphQL APIs, internal services, and external vendor APIs with solid error handling and rate limiting
• Build resilient event-driven systems on AWS (SQS, ECS, S3, RDS) with idempotency, retries, and dead-letter handling
• Profile and debug live pipelines to keep them fast, reliable, and accurate under uneven workloads

What You Bring

• Deep, production-grade experience with Python and FastAPI, including async services and clean API contracts
• Hands-on experience building pipelines that process large volumes of messy or semi-structured data at scale
• Practical experience with Elasticsearch or OpenSearch (index design, mappings, bulk indexing, query optimization)
• Practical GraphQL experience, including schemas, mutations, and cross-service API contracts
• Strong working knowledge of AWS (ECS, SQS, S3, RDS) and deploying containerized services in production
• PostgreSQL or equivalent, plus async ORMs such as SQLAlchemy
• Experience with message queues (SQS, Kafka or similar), retry strategies, idempotency, and dead-letter queues
• Ability to turn ambiguous requirements into resilient designs without close supervision
• Comfort using logs, traces, metrics, and database profiling to diagnose live issues

NICE TO HAVE

• Experience with LLM APIs and agent workflows (LangGraph, LangChain, LiteLLM, structured outputs, tool calling)
• Familiarity with TypeScript and Node.js / NestJS
• Parsing complex documents (PDF, DOCX, large spreadsheets, JSON exports)
• Infrastructure-as-code (AWS CDK, Terraform, or similar)
• Workflow orchestration frameworks (Inngest, Temporal, or similar)

How You Work

• You explain your design decisions clearly in writing, so others can follow your reasoning without a call
• You bring a considered position to design reviews and change it when a better argument comes along
• You give and receive direct, specific feedback on code and designs without defensiveness
• You question complexity before adding it and favor the simplest solution that works

This posting may involve the use of AI tools to assist in reviewing applications; final hiring decisions are made by humans.