Backend NestJs Developer

Accountabilities:: Investigate, diagnose, and resolve production issues across distributed microservices, tracing requests from user-facing APIs through services and external integrations. Support incident response by identifying root causes, implementing fixes, adding regression tests, and documenting findings to prevent recurrence. Develop and deliver enhancements to existing services, including certification program updates, scorecard and scoring changes, payment adjustments, and integration improvements. Maintain and extend the platform's layered service architecture, following established patterns and shared internal libraries across API gateways, business logic services, and external system adapters. Maintain integrations with third-party platforms covering performance data, CRM, ERP, payment processing, email, and cloud file storage. Write and update database migration scripts and investigate production data issues carefully, particularly when working with live data. Collaborate with QA and product teams to clarify expected behavior, reproduce issues, confirm requirements, and support testing and release verification. Improve production observability through structured logging, sensitive-data masking, and clearer system visibility. Participate in code reviews and keep technical documentation accurate and up to date as the platform evolves. Use AI coding agents to investigate, develop, and deliver solutions efficiently while validating generated code and maintaining engineering standards. Requirements: Proven ability to take ownership of technical problems from initial bug reports or change requests through testing, deployment, and resolution. Production experience building and maintaining backend services with Node.js and TypeScript. Strong experience with NestJS or a comparable structured backend framework, including modules, controllers, services, dependency injection, and middleware. Solid understanding of REST and HTTP fundamentals, including service-to-service communication, API contracts, versioning, and error handling. Experience with relational databases, particularly writing and reviewing PostgreSQL queries and following safe database migration practices. Proven ability to debug distributed systems involving multiple services, using logs and metrics to identify root causes rather than symptoms. Sound technical judgment and risk awareness, especially when making changes involving payments, authentication, and live production data. Experience integrating third-party systems such as payment providers, CRM and ERP platforms, and identity providers through well-designed internal interfaces. Understanding of authentication and authorization patterns, including OAuth 2.0, JWT verification, single sign-on (SSO), and machine-to-machine authentication. Familiarity with agentic development and practical experience using AI coding agents to investigate, build, and ship software while carefully reviewing their output. Ability to write effective tests that validate fixes and prevent regressions. Excellent written and verbal communication skills, including the ability to produce clear status updates, incident reports, pull request descriptions, and actionable documentation. Nice to have: Experience supporting a platform transitioning from active development to ongoing maintenance and enhancement. Familiarity with adapter patterns that isolate external integrations from core business logic. Experience with webhook-driven integrations, including signature verification, scoped service-to-service authorization, and safe handling of repeated inbound events. Familiarity with Docker, Kubernetes, and services deployed on major cloud platforms such as AWS. Experience with observability practices, including structured logging and sensitive-data masking. Benefits: Fully remote work arrangement for candidates currently residing in Latin America. Full-time employment or B2B contract options. Opportunity to work on a live, business-critical microservices platform. Supportive team environment with a high degree of autonomy and ownership. Opportunity to use modern AI coding agents and contribute to evolving agentic development practices. Salary, healthcare coverage, and specific paid leave details are not specified in the job description.