MasterBorn

Designs, builds, and scales custom software

Middle Backend Developer - Node.js

Backend EngineeringConfirmed live in the last 24 hours

Full-timeWrocław, PolandPLN10k - PLN18k /mo

About the Job

Requirements

At least 2 years of commercial experience with Node.js.
Practical experience with at least one Node.js backend framework, such as Express.js, NestJS, or Fastify, including familiarity with its basic APIs and features and work on 1–2 projects using such technologies.
Strong proficiency in TypeScript, including practical experience with static typing, advanced types, and TypeScript compiler configuration.
Experience potentially includes using NoSQL or in-memory databases as data stores.
Experience working with SQL databases for integration and basic design, using an ORM or query builder such as Prisma or Knex.
Practical understanding of AI and large language models, including context, prompts, and limitations, and hands-on experience contributing to AI-powered backend features such as integrating large language model APIs, basic retrieval-augmented generation flows, or simple agent-style workflows.
Experience integrating AI into daily development for prototyping, boilerplate, and tests, and verifying and adapting the output to production-quality standards.
English proficiency at B2 level to cooperate with American clients.
Polish proficiency at C1 level to communicate within the team.
Ability to translate business complexities, including user stories and tasks, into solutions and estimates.
Ability to diagnose issues, suggest solutions, and make decisions based on project requirements.

Responsibilities

Write readable, testable, maintainable JavaScript and TypeScript code using object-oriented programming principles.
Own backend features from understanding requirements through implementation, testing, and deployment.
Document delivered code and technical decisions.
Review other developers’ code, provide constructive feedback, and share knowledge.
Participate directly in designing and modifying basic database structures and API contracts.
Propose pragmatic improvements and proactive ideas or solutions to enhance the product and team processes.
Share insights with the team to diagnose issues, communicate risks, and focus on solutions.
Participate in project discussions, refinements, and technical decision-making.
Listen to client needs and, after consulting the team, suggest practical solutions.
Support less experienced team members through code review, explanations, and pair programming.
Use AI tools responsibly in daily work, verifying and adapting results to production standards.
Stay current with trends and news, share them with the team, and teach others.

Desired Qualifications

Daily experience working in Agile or Scrum with people of similar skills and monitoring code quality.
Basic experience with AWS services.
Basic experience with Docker, including preparing and debugging environments and connecting components for local work.
Experience working at the very beginning of product development or creation.

Salary Range: 10000 to 18000 (Currency: PLN) (Pay period: per-month-salary)

We are looking for a skillful Backend Developer to join one of our teams working with US clients - referrals from the high-end American IT market.

Our tech stack is built around React, Node.js and TypeScript. We are working with well-established companies and sometimes startups in their early stages (MVPs), which makes the job full of diversity and exciting challenges while crafting cutting-edge solutions.

Enjoy the flexibility of working within the Polish time zone and collaborate with clients from diverse industries such as FinTech, SportsTech, MedTech, and many others.

Contract summary:

Rate: PLN 10.000 - 18.000 + VAT (B2B)
Contract: B2B/UZL, paid days off, 100% remote (or hybrid/onsite - as you prefer), Polish time zone, Europe-based, flexible hours, full-time position, long-term contract, Scrum Teams and more
Perks and Benefits: 3,000 PLN annual training budget, Multisport, Luxmed, Cafeteria Platform, Tech-talks, Learning sessions, and more
Tools you'll use: Apple MacBook Pro, Slack, GSuite, GitHub, Jira, Coda, FigJam, Claude Code

Your future tasks:

Writing readable, testable and easy-to-maintain JS/TS code with OOP flavor
Taking ownership of backend features from understanding requirements through implementation, testing and deployment
Writing documentation for delivered code and technical decisions
Code review of other developers in the team, including constructive feedback and knowledge sharing
Direct involvement with the design and modification of basic DB structures and API contracts
Propose pragmatic improvements and proactive ideas/solutions to enhance the product and team’s work processes
Share insights with the team to diagnose issues, communicate risks and focus on solutions
Actively participate in project discussions, refinements and technical decision-making
Listen to the client's needs and, after consulting the team, suggest practical solutions
Support less experienced team members through code review, explanations and pair programming
Use AI tools responsibly in daily work, verifying and adapting results to production standards

About you - Tech skills & Experience:

2+ years of commercial experience in Node.js
Good experience with at least one Node.js backend framework (e.g. Express.js, NestJS, Fastify, etc) - you know most of its basic APIs/features, worked on at least 1-2 projects involving such technologies
Strong proficiency in TypeScript. You have practical experience with static typing, advanced types, and configuring TS compilers, treating it as your primary language to build robust and type-safe backend applications
Potentially worked with NoSQL databases and/or in-memory databases and utilized them as a data store
Worked with SQL databases (integration-wise and as a basic design skill) with ORM or query builder tool (ie. Prisma, Knex)
Understands how AI/LLMs work in practice (context, prompts, limitations) and has hands-on experience contributing to AI-powered backend features (e.g. integrating LLM APIs, basic RAG flows, or simple agent-style workflows)
Integrates AI seamlessly into daily development workflow - uses it for prototyping, boilerplate, and tests, while always verifying and adapting output to production-quality standards

About you - Soft Skills:

English level B2 to cooperate with American clients
Polish level C1 to communicate easily within the team
Open-minded to new challenges (e.g. different frameworks)
Understand the significance of MVP and prioritize the pursuit of excellence and high-quality outcomes, even amid tight project timelines.
Communicate with the team to efficiently translate business complexities (user stories/tasks) into solutions (results/estimations)
Staying on top with trends/news, sharing them, teaching others and aiming for the best quality solutions
Strong problem-solving abilities to diagnose issues, suggest solutions, and make decisions based on project requirements.

Nice to have:

Worked in Agile/Scrum on a daily basis consisting of people with similar skills and monitoring code quality on a daily basis
Basic experience with AWS - used some services in specific cases
Basic experience with Docker - know how to prepare and debug the environment and connect things up to work locally
Worked in the very beginning of the product development/creation stage
Understand the significance of MVP and aim to deliver top-notch results, even amid tight project timelines

Recruitment Process:

CV Review
Phone call with our Recruiter (15min)
Soft-skills interview with our Recruiter (45 min)
Technical interview with our Senior Specialists (1,5h)
Decision and feedback 🥳

Meaningful projects, top-notch experts and value-driven workplace

Sound good?

Apply now!

About the Company

MasterBorn

Designs, builds, and scales custom software

MasterBorn is a full‑service software development partner that helps clients design, build, and scale custom software products. It works by collaborating with clients to turn their vision into practical software, delivering results faster and with smarter decisions, while providing expert support at every step from discovery through delivery to scaling. What sets MasterBorn apart from competitors is its end‑to‑end, hands‑on partnership approach—covering design, development, architecture, and ongoing scaling with a team of experienced professionals—so clients can reduce risk and move from idea to a shipped product quickly. The company's goal is to help organizations turn their ideas into scalable software solutions by delivering the right product, on time, with the guidance of experienced engineers and consultants.

Company size: 11-50
Company stage: Not listed
Total funding: Not listed
Headquarters: Austin, TX
Founded: 2016

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