Backend Developer, AI

Kiwi

. Design, build, and evolve scalable backend services and APIs using Node.js, TypeScript, and Express.js .

Posted 9/17/2026full-timeRemote • Colombia, ArgentinaSeniorLeadWebsite

Core Competencies

Role fit

Core Competencies

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Demonstrates extensive experience in designing and building scalable backend services using Node.js, TypeScript, and PostgreSQL, with a strong focus on API design, observability, and production support. Proven ability to manage technical solutions end-to-end while collaborating effectively with cross-functional teams in high-volume transactional environments.

Highest-signal resume keywords

Node.js DevelopmentTypeScript ProficiencyPostgreSQL ExpertiseAPI Design and IntegrationAWS Cloud Services

ATS Keywords

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Hard Skills

Backend EngineeringSoftware ArchitectureAutomated TestingEvent-Driven ArchitectureCI/CD PracticesORMs and Persistence PatternsObservability and TroubleshootingData ModelingAsynchronous ProcessingFinancial Workflows

Soft Skills

Problem-SolvingCommunicationOwnershipCollaborationTechnical Decision-Making

Tools & Technologies

Express.jsAWS LambdaTerraformDatadogSentryCloudFormationFastAPIDjangoECS/EKSRDS

Industry Keywords

FintechPaymentsBankingTransactional SystemsData Integrity

Tech Stack

Tools & technologies

AWSCloudDistributed SystemsDjangoJavaScriptNode.jsPostgresPythonTerraformTypeScript

About the role

Key responsibilities & impact

Design, build, and evolve scalable backend services and APIs using Node.js, TypeScript, and Express.js
Own technical solutions end-to-end from design and implementation through deployment, observability, and production support
Contribute to backend architecture and architectural and technical design decisions
Identify, prioritize, and address technical debt
Apply software design principles and patterns based on context and trade-offs
Design application boundaries and separation of concerns across services, business logic, and persistence layers
Design and optimize PostgreSQL schemas, queries, indexes, migrations, and transactional workflows
Build reliable financial workflows covering idempotency, concurrency, consistency, retries, failure handling, and reconciliation
Design and maintain REST APIs and integrations with internal systems and external providers
Design asynchronous and event-driven workflows
Build reliable, scalable, resilient, secure, and performant systems
Work with AWS infrastructure and cloud services in production systems
Improve production visibility through logging, metrics, tracing, monitoring, and alerting
Investigate production incidents, perform root-cause analysis, and implement sustainable solutions
Maintain engineering quality through automated testing, code reviews, documentation, and continuous refactoring
Use AI-assisted engineering tools for development, testing, debugging, code review, and productivity
Challenge technical decisions and improve engineering standards
Share knowledge and strengthen the engineering team’s technical capabilities
Collaborate with Product, QA, Data, Platform, and engineering teams to translate business requirements into technical solutions

Requirements

What you’ll need

8+ years of professional backend engineering experience, with significant experience building and operating production systems
Strong hands-on experience with Node.js and TypeScript in production environments
Experience with Express.js or comparable backend frameworks
Experience with Python and familiarity with backend frameworks such as FastAPI, Django, or similar is highly valued
Strong knowledge of software architecture, design principles, and design patterns, including their trade-offs and appropriate use cases
Strong understanding of relational databases and PostgreSQL, including data modeling, transactions, indexing, query optimization, migrations, and performance
Experience working with ORMs and persistence patterns, understanding both their benefits and limitations
Strong understanding of API design, authentication, authorization, versioning, security, and third-party integrations
Experience designing systems for failure scenarios, including retries, duplicate events, partial failures, race conditions, and external-service degradation
Solid understanding of distributed systems and asynchronous processing
Experience with automated testing at different levels, including unit, integration, and end-to-end testing
Production experience with AWS or comparable cloud infrastructure
Experience with CI/CD, containers, and modern software delivery practices
Strong understanding of observability and production troubleshooting
Ability to analyze architectural alternatives, identify trade-offs, and clearly explain technical decisions
Strong ownership, problem-solving, and communication skills
Ability to work autonomously on complex technical problems while collaborating effectively with the broader team
Experience in fintech, payments, lending, banking, or other highly transactional environments is nice to have
Experience building systems where financial correctness and data integrity are critical is nice to have
Experience with event-driven architectures, queues, messaging systems, and asynchronous processing is nice to have
Experience with AWS services such as Lambda, ECS/EKS, SQS, SNS, EventBridge, RDS, S3, and CloudWatch is nice to have
Experience with Infrastructure as Code, such as Terraform or CloudFormation, is nice to have
Experience with high-volume transactional systems and distributed architectures is nice to have
Experience implementing idempotency, outbox patterns, concurrency control, reconciliation processes, and fault-tolerant workflows is nice to have
Experience with observability platforms such as Datadog, Sentry, or similar tools is nice to have
Familiarity with DDD, Clean Architecture, Hexagonal Architecture, or similar architectural approaches is nice to have
Experience using modern AI coding assistants, agents, and AI-native development workflows is nice to have
Familiarity with LLMs, tool calling, MCP, agentic workflows, or AI integrations is a plus

Benefits

Comp & perks

The opportunity to work on critical financial products with direct impact on customers and business growth
High technical ownership and the opportunity to influence how the backend platform evolves
Meaningful architecture, scalability, reliability, and technical-debt challenges
An engineering environment where AI is becoming a core part of how we build software
A collaborative multidisciplinary team across Engineering, Product, Design, QA, Data, and Platform
100% remote work