Senior Backend Engineer - Fintech (Node.js/TypeScript, PostgreSQL)

Ranger Technical Resources, Inc.; Colombia; On-site; COP 150,000,000 - 230,000,000; Full time

Job summary

Ranger Technical Resources, Inc. is partnering with a fast-growing fintech across Latin America to hire a Senior Backend Engineer who can own complex systems for loans, payments, balances, applications, and external integrations.

You will build with Node.js, TypeScript, and PostgreSQL, contribute to backend architecture, reliability, and production decisions, and help raise engineering depth while staying hands-on with code.

Qualifications

• Bachelor's degree or equivalent experience in CS/engineering.
• 8+ years backend experience with ownership of complex production systems.
• Strong Node.js/TypeScript backend services, APIs, and integrations.
• Advanced PostgreSQL data modeling, transactions, indexing, and optimization.
• Experience with transactional systems, idempotency, and failure recovery.
• Proven influence on architecture, service design, and tradeoffs.
• Experience investigating incidents and improving reliability and observability.
• Experience operating backend apps in AWS or other clouds.

Responsibilities

• Design and build backend services, APIs, integrations, and transactional workflows using Node.js and TypeScript.
• Design PostgreSQL data models, transactions, indexes, queries, and database changes for correctness and performance.
• Protect data integrity through idempotency, concurrency controls, transactions, and failure handling.
• Design external integrations with timeouts, retries, duplicates, and partial failures.
• Influence backend architecture, service boundaries, and the placement of business logic.
• Evaluate technical debt and decide when improvements are necessary.
• Build observability into services via structured logging, metrics, monitoring, and alerts.
• Investigate production incidents, identify root causes, and implement fixes to prevent recurrence.
• Own backend capabilities from design to production improvements.
• Collaborate with Product, Data, Platform, QA, frontend, and full-stack engineers to deliver complete solutions.
• Challenge assumptions and propose better approaches to reduce risk or complexity.
• Improve engineering standards, code quality, testing, and architectural consistency.
• Use AI-assisted development tools while reviewing, testing, and taking responsibility for generated code.

Skills

Node.js

TypeScript

Data Modeling

Transactional Systems

System Design

API Design

Distributed Systems

Idempotency

Concurrency Control

Database Optimization

Query Optimization

Observability

AWS

Express.js

Technical Architecture

AI-Assisted Development

Education

Bachelor's degree in Computer Science, Software Engineering, or related field

Tools

PostgreSQL

Node.js

TypeScript

AWS

Job description

Ranger Technical Resources, Inc. is partnering with a fast-growing fintech across Latin America to hire a Senior Backend Engineer who can own complex systems for loans, payments, balances, applications, and external integrations.

You will build with Node.js, TypeScript, and PostgreSQL, contribute to backend architecture, reliability, and production decisions, and help raise engineering depth while staying hands-on with code.