Middle Backend Developer, Node.js

MasterBorn Software

. Write readable, testable, and maintainable JavaScript/TypeScript code with an OOP approach .

Posted 9/18/2026full-timeRemote • PolandJuniorMid-Level💰 PLN 10,000 - PLN 16,000 per monthWebsite

Core Competencies

Role fit

Core Competencies

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Demonstrates strong capabilities in writing maintainable JavaScript and TypeScript code, with a focus on OOP principles and backend feature ownership. Proficient in collaborating with clients across various industries, providing solutions, and mentoring team members through code reviews and pair programming.

Highest-signal resume keywords

Node.js Backend DevelopmentTypeScript ProficiencyExperience with NoSQL and SQL DatabasesAI-Powered Backend FeaturesAgile/Scrum Methodologies

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

JavaScriptTypeScriptNode.jsExpress.jsNestJSFastifyNoSQL DatabasesSQL DatabasesPrismaKnex

Soft Skills

Problem-SolvingCollaborationKnowledge SharingCommunication

Tools & Technologies

DockerGitHub ActionsAWS

Industry Keywords

FinTechSportsTechMedTechAI/LLM Context

Tech Stack

Tools & technologies

AWSDockerJavaScriptNode.jsNoSQLSQLTypeScript

About the role

Key responsibilities & impact

Write readable, testable, and maintainable JavaScript/TypeScript code with an OOP approach
Own backend features from requirements analysis through implementation, testing, and deployment
Write documentation for delivered code and technical decisions
Review other developers’ code and provide constructive feedback and knowledge sharing
Design and modify basic database structures and API contracts
Propose pragmatic improvements and proactive ideas for the product and team processes
Share insights to diagnose issues, communicate risks, and focus on solutions
Participate in project discussions, refinements, and technical decision-making
Understand client needs and suggest practical solutions after team consultation
Support less experienced team members through code review, explanations, and pair programming
Use AI tools responsibly, verifying and adapting results to production standards
Collaborate with US clients across FinTech, SportsTech, MedTech, and other industries

Requirements

What you’ll need

2+ years of commercial experience in Node.js
Good experience with at least one Node.js backend framework, such as Express.js, NestJS, or Fastify
Strong proficiency in TypeScript, including static typing, advanced types, and TypeScript compiler configuration
Experience with NoSQL and/or in-memory databases
Experience with SQL databases and ORM or query builder tools such as Prisma or Knex
Hands-on experience contributing to AI-powered backend features, such as LLM API integration, basic RAG flows, or simple agent-style workflows
Practical understanding of AI/LLM context, prompts, and limitations
English level B2
Polish level C1
Ability to work with different frameworks and understand MVP priorities
Strong problem-solving abilities
Knowledge of SOLID and KISS principles
Knowledge of design and architecture patterns
Knowledge of Docker and GitHub Actions
Basic usage of AWS services
Agile/Scrum experience, Docker, AWS, and early-stage product development experience are nice to have

Benefits

Comp & perks

B2B/UZL
Paid days off
100% remote, or hybrid/onsite according to preference
Flexible hours
Full-time position
Long-term contract
Polish time zone
Scrum Teams
Learning budget
Budget for health insurance and sports
Regular feedback, support, and real learning opportunities
Access to internal Design Talks and Tech Talks
Apple MacBook Pro
Slack, GSuite, GitHub, Jira, Coda, FigJam, Claude Code