Backend NestJS Developer (Poland)

Productiv; United States; Remote; USD 120,000 - 180,000; Full time

Job summary

Productiv is seeking a proactive Backend Developer to own and improve a live microservices platform. You will investigate bugs, implement changes across services, and ship features with AI-assisted tooling while maintaining strong code quality.

You will work in a highly autonomous, production-focused environment, balancing incident response with feature delivery and ensuring robust integrations with ERP, CRM, and payment providers.

Qualifications

• Proven ownership from bug report to production solution.
• Experience building backend services with Node.js and TypeScript.
• Strong NestJS experience, including modules, controllers, services, DI, and middleware.
• Solid REST fundamentals: service-to-service, versioning, error handling.
• Relational databases experience; PostgreSQL queries and migrations.
• Debug distributed systems across multiple services using logs and metrics.
• Risk-aware judgment for local fixes vs rollouts in payments and live data.
• Experience integrating third-party systems (payments, CRMs, ERPs, identities).
• Understanding OAuth 2.0, JWT, SSO, and machine-to-machine auth.
• Comfortable with agentic development and AI coding tools.
• Ability to write tests that prevent regressions.
• Clear written and verbal communication for status updates and docs.

Responsibilities

• Resolve production issues across distributed microservices and trace requests end-to-end.
• Support incident response with root-cause analysis, fixes, and regression tests.
• Deliver enhancements to services, including payment adjustments and integrations.
• Work within a layered architecture from API gateway to adapters.
• Maintain integrations with external platforms (ERP, CRM, payment systems, email, cloud storage).
• Manage data changes with migration scripts and live-data testing.
• Collaborate with QA and product to clarify behavior and verify fixes.
• Improve observability and documentation; participate in code reviews.

Skills

Ownership

Node.js

TypeScript

NestJS

REST APIs

PostgreSQL

Distributed systems

Authentication

Observability

Testing

AI coding

Tools

Docker

Kubernetes

AWS

Git

Job description

About the role

We are seeking a proactive, technically strong Backend Developer to keep a live, business-critical microservices platform healthy while delivering meaningful improvements on top of it.

This is a hands-on role with a high degree of autonomy: you'll take a bug report or change request, investigate it across the codebase, and see it through to production. You'll balance production support with feature engineering, backed by a supportive team, and we're embracing agentic development with AI coding agents to ship efficiently without compromising quality.

Key responsibilities

• Resolve production issues: Triage, diagnose, and resolve issues across distributed microservices, tracing a request from the user-facing API down to the services that talk to external systems.
• Support incident response: Investigate root causes, apply fixes, add regression tests, and document findings so issues don't recur
• Deliver enhancements: Build improvements to existing services, including new versions of certification programs, scorecard and scoring changes, payment adjustments, and integration updates
• Work within the architecture: Follow established patterns and shared internal libraries in a layered service architecture, from the API gateway through the business logic services down to the adapters that integrate with external systems
• Maintain integrations: Maintain and extend integrations with external platforms for performance data, CRM, enterprise resource planning (ERP), payment processing, email, and cloud file storage
• Manage data changes: Write and update database migration scripts and investigate data-related production issues carefully against live data
• Partner with QA and product: Answer testers’ questions, clarify expected behavior, help reproduce issues, and support verification so fixes and features can be signed off smoothly. Ask product clarifying questions early and confirm intent and edge cases
• Improve observability and documentation: Contribute structured logging, masking of sensitive data, and clearer production visibility, and take part in code review while keeping documentation current as the platform grows

Required qualifications

• Proven ability to take ownership of a problem from start to finish, from initial bug report or change request through to a tested, deployed solution
• 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 REST/HTTP fundamentals, including service-to-service communication, API contracts, versioning, and error handling
• Comfortable with relational databases, writing and reviewing PostgreSQL queries, and safe migration practices
• Experience debugging distributed systems where a single feature spans several services, reading logs and metrics to find root causes rather than symptoms
• Sound judgment about risk, including the difference between a safe local fix and a change that calls for a rollout plan, particularly for payments, authentication, and live data
• Experience integrating third-party systems (payment providers, CRMs, ERPs, identity providers) behind a clean internal interface
• Understanding of authentication patterns: OAuth 2.0, JWT verification, single sign-on (SSO), and service-to-service (machine-to-machine) authentication
• Comfortable with agentic development, using AI coding agents and tooling to investigate, build, and ship work efficiently while keeping a careful eye on quality
• Ability to write tests that confirm fixes and prevent regressions
• Excellent written and verbal communication, including clear status updates, incident notes, pull request descriptions, and documentation others can act on

Nice to have

• Experience supporting a platform through the transition from active build to maintenance-and-enhancement mode
• Familiarity with adapter patterns that isolate external systems from core business logic
• Experience with webhook-driven integrations, including verifying signatures, scoped service-to-service authorization, and safely handling repeated inbound events
• Familiarity with containers and orchestration (Docker and Kubernetes) and services deployed on a major cloud provider such as AWS
• Experience with observability practices such as structured logging and masking of sensitive data