Backend Developer

Productiv; Polska; Hybrid; PLN 180,000 - 280,000; Full time

Benefits offered by this job

Remote

Flexible engagement

Job summary

Productiv is seeking a proactive Backend Developer to sustain a live microservices platform and deliver meaningful improvements. You will own bug reports, investigate across the codebase, and ship changes to production with autonomy and a team focused on quality.

The role emphasizes AI-assisted development, strong observability, and robust integrations with external systems. Responsibilities include triage of production issues, incident response, and delivering enhancements such as updates to

Qualifications

• Proven ability to take ownership of a problem end-to-end.
• Production experience building and maintaining backend services with Node.js and TypeScript.
• Strong experience with NestJS and modular backend design.
• Solid REST/HTTP fundamentals and service-to-service communication.
• Comfortable with PostgreSQL and safe migration practices.
• Experience debugging distributed systems and tracing root causes.
• Understanding of OAuth 2.0, JWT, SSO and machine-to-machine auth.
• Experience using AI-assisted coding tools for efficient development.
• Ability to write tests to confirm fixes and prevent regressions.
• Excellent written and verbal communication, status updates, and documentation.

Responsibilities

• Triage, diagnose, and fix production issues across microservices.
• Investigate root causes, apply fixes, and add regression tests.
• Deliver enhancements to existing services and integrations.
• Follow architecture patterns and internal libraries across API gateway to adapters.
• Maintain and extend integrations with external platforms (ERP, CRM, payments).
• Write and update database migration scripts and handle data-related issues safely.
• Collaborate with QA and product to clarify expected behavior and edge cases.
• Improve observability through structured logging and clear production visibility.

Skills

Node.js

TypeScript

NestJS

REST APIs

PostgreSQL

Distributed systems

OAuth 2.0

JWT / SSO

Testing

Observability

Tools

Docker

Kubernetes

AWS

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

All our positions are Remote and are available as Full Time Employment or B2B Contracts