Middle Support Engineer (Node.js)

masterborn-2; United States; Remote; USD 78,000 - 123,000; Full time

Benefits offered by this job

Paid time off

Learning budget

Health insurance

Sport benefit

Job summary

Masterborn-2 zoekt een mid-level Support Engineer voor een US-gebaseerd betalingsproduct. Je onderhoudt en verbetert een schaalbare Node.js backend, triageert issues tijdens de 14:00-22:00 CET/CEST shift en levert tijdige fixes binnen een Scrum-team.

Je debugt Node.js/TypeScript services op AWS, schrijft leesbare code en vertaalt user stories naar praktische oplossingen. Deze rol combineert hands-on troubleshooting met proactieve productverbeteringen en kennisdeling.

Qualifications

• 2+ years of commercial experience building production Node.js apps.
• Experience debugging AWS services (Cognito, CloudWatch, SQS, SES, Lambda).
• Strong JavaScript (ES2018+), OOP, clean code; backend framework experience (Express.js).
• Experience with SQL databases using ORMs/Query Builders (Sequelize, Knex).
• Familiarity with NoSQL data stores like MongoDB or Redis.
• English C1 for client communication; Polish C1 for internal coordination.

Responsibilities

• Triage incoming client reports, prioritize bugs, and drive issues to resolution during the 14:00-22:00 CET/CEST shift.
• Debug Node.js/TypeScript services running on AWS, review error tracking and infra.
• Write and maintain readable JavaScript code following SOLID, KISS, design patterns.
• Modify and design basic database structures across SQL and NoSQL stores.
• Translate user stories into working solutions and estimates with the team.
• Contribute to the internal knowledge base and share trends and techniques.

Skills

Node.js

JavaScript

Express.js

AWS

SQL

NoSQL

ORMs

Redis

MongoDB

Polish (C1)

English (C1)

Tools

Docker

GitHub Actions

Job description

Role overview

This position focuses on maintaining and improving a modern, scalable web application for a US-based payments product, working as a mid-level Support Engineer on a Node.js backend stack. The engineer serves as the technical contact during the afternoon/evening shift (14:00-22:00 CET/CEST), triaging issues, debugging production systems, and contributing code fixes. The work blends hands-on troubleshooting with proactive product improvements inside a Scrum team.

Responsibilities

• Triage incoming client reports, prioritize bugs, and drive issues to resolution during the 14:00-22:00 CET/CEST shift.
• Debug modern Node.js/TypeScript services running on AWS, reviewing error tracking tools, infrastructure, and third-party integrations.
• Write and maintain readable JavaScript code, applying SOLID, KISS, and established design and architecture patterns.
• Modify and design basic database structures across SQL and NoSQL stores, and document delivered solutions.
• Translate user stories and business complexity into working solutions and estimates in collaboration with the team.
• Contribute to the internal knowledge base and share emerging trends, techniques, or libraries with peers.

Requirements

• 2+ years of commercial experience building production Node.js applications.
• Working knowledge of AWS services used for debugging, such as Cognito, CloudWatch, SQS, SES, and Lambda.
• Solid grasp of modern JavaScript (ES2018+), OOP, clean code principles, and at least one backend framework, preferably Express.js.
• Hands-on experience with relational SQL databases using ORMs or query builders (e.g., Sequelize, Knex).
• Familiarity with NoSQL or in-memory data stores such as MongoDB or Redis.
• C1-level English for client communication and documentation, plus C1-level Polish for internal team coordination.
• Strong problem-solving instincts, attention to detail, and comfort delivering high-quality work under tight timelines.

Nice to have

• Prior support, on-call, or other customer-facing engineering experience.
• TypeScript fluency, additional backend frameworks, or serverless background.
• Comfort with Docker for local environments and GitHub Actions for CI pipelines.
• Working in Agile/Scrum teams with daily code-quality reviews.
• Basic React debugging skills.
• Open-source contributions or familiarity with automation tools such as n8n, Zapier, or Make.

Benefits and work setup

• B2B contract at PLN 10,000-16,000 + VAT per month, full-time and long-term.
• 100% remote, hybrid, or on-site options available based on preference.
• Paid time off, a learning budget, health insurance, and a sport benefit.
• Access to internal design and tech talks, regular feedback cycles, and Scrum team rituals.
• Recruitment flow: CV review, recruiter phone screen, soft-skills interview, technical interview with a specialist, and final feedback.