Jobs Poland, Node.js

SKELAR is a venture builder that builds international IT product companies according to the rules of the venture capital world. Together with our co-founders, we assemble strong teams to launch tech businesses and win in global markets.

We are currently looking for a Backend Engineer (MarTech).

We are Leaply, an ecosystem of digital and physical products designed to help people build healthy habits and improve their quality of life. We operate in global markets - the US, Tier 1, Europe, and beyond.

In June 2024, we launched an app focused on habit-building, using a subscription-based monetization model and a performance-first marketing approach (Meta, Google, TikTok). Within the first two months, we achieved positive unit economics and are now on track to grow 10x by the end of the year.

Our team is building its third business together, with successful exits behind us and a deep understanding of our niche and target audience. We move fast, communicate openly, and set ambitious goals.

What you’ll do:
— Build and evolve a unified marketing technology platform — not just a collection of tools, but a cohesive system that directly drives business performance;

— Take full ownership of 5+ existing services (Hokuto, UA automation, Creo Factory, Revealbot, Creo-translate): evaluate their current state, identify architectural bottlenecks, and systematically improve reliability, scalability, and maintainability;

— Develop and maintain production-grade integrations with Meta / TikTok / Google — ensuring robust error handling, rate limiting, retries, and clear monitoring so the system operates reliably without silent failures;

— Redesign the tracking architecture by shifting from client-side to server-side (CAPI pattern for Facebook and similar platforms), implement proper test coverage, and build tools that allow Growth Managers to independently configure tracking for their funnels;

— Eliminate manual operational workflows (e.g., in Airtable) and enable marketing teams (UA managers, designers, growth managers) to operate independently without engineering support for routine tasks;

— Proactively identify and implement new martech solutions before they become bottlenecks - shaping the long-term vision of the domain and driving technical and product priorities.

This role is for you if...

Must-have

— 3+ years of commercial backend development experience;

— Node.js / TypeScript as the main stack;

— Strong experience building reliable API integrations — including error handling, rate limiting, retries, and webhooks;

— GCP experience — Cloud Functions, Cloud Run, BigQuery, Firestore, or similar cloud environments;

— Systems thinking — able to see the system beyond individual tasks; independently designs architecture and defines development priorities;

— High level of autonomy — does not require a PM to define tasks; identifies problems and proposes solutions independently;

— Ability to collaborate with non-technical stakeholders — UA managers, designers, growth managers;

— Ownership mindset — proactively identifies risks, drives solutions, and thinks in terms of business impact;

— Uses AI as part of their workflow to move faster and think broader.

Nice-to-have

— Experience with Meta Business SDK / TikTok Marketing API / Google Ads API;

— Understanding of performance marketing — ROAS, CAPI, pixels, attribution;

— Experience building server-side tracking (e.g., Facebook CAPI or similar);

— Experience with marketing automation tools (Airtable automations, Make/Zapier, or custom solutions);

— Experience working on B2C subscription products with aggressive performance marketing.

SKELAR is an environment for self-realization of people who are able to create successful companies. We call such companies the next big everything. We believe in their power and scale.

To do this, we have created all the opportunities within our venture builder:

— 8 infrastructure teams that help businesses close any issues: from recruiting and communications to finance and legal issues;
— A community of founders who have already launched more than one business and can share practical experience;
— Internal clubs by professional areas: marketing, development, finance, recruiting, brand ambassadorship;
— Trainings, courses, attending conferences;
— Health insurance.

BrainRocket is a global company creating end-to-end tech products for clients across Fintech, iGaming, and Marketing. ‍Young, ambitious, and unstoppable, we've already taken Cyprus, Malta, Portugal, Poland, and Serbia by storm. Our BRO team consists of 1,300 bright minds creating innovative ideas and products. We don’t follow formats. We shape them. We build what works, launch it fast, and make sure it hits.

❗️Please note that this role is office-based for Poland, Warsaw.

❗️If you need to be relocated, we take care of the process.

We are looking for a skilled Team Lead Back-end Developer (Node.js) to join our team in Warsaw, Poland.

✅Responsibilities:
✔️ Being transparent with the team about challenges, failures, and successes;
✔️ Hiring and training technical personnel;
✔️ Determining project requirements and developing work schedules for the team;
✔️ Delegating tasks and achieving daily, weekly, and monthly goals;
✔️ Liaising with team members and management to ensure projects are completed to standard;
✔️ Motivating staff and creating a space where they can ask questions and voice their concerns;
✔️ Delegating work and assignments to team members;
✔️ Collaborating with their team to identify and fix technical problems;
✔️ Advanced level of English.

And for the Developer part:
✔️ In-house platform development;
✔️ 3rd party API integrations;
✔️ Actively participate in developing new features from scratch;

✅ Requirements:

✔️ At least 8+ years of experience, 3+ years in leadership;
✔️ Excellent technical, diagnostic, and troubleshooting skills;
✔️ Strong leadership and organizational abilities;
✔️ Knowledge of JavaScript and the ECMAScript 6 standards;
✔️ 3+ years of commercial experience with Node.js;
✔️ 5+ years of commercial experience in web development;
✔️ Commercial experience of working with DB;
✔️ Commercial experience in implementing REST and WebSockets;
✔️ Experience of GIT version control system;
✔️ Experience with databases MySQL;
✔️ Experience with RabbitMQ;
✔️ Experience with Redis.

✅Nice to Have:
✔️ Experience with TypeScript.

✅ We offer excellent benefits, including but not limited to:

🚀 Career growth opportunities in an international and dynamic environment;
📚 Opportunity to develop language skills with partial compensation for language courses;
🎁 Special gifts for birthdays, weddings, and newborns;
🏝️ 20 working days of paid annual vacation, plus paid sick leave;
🍲 Office snacks and refreshments;
🏋️‍♂️ Sports package to support a healthy lifestyle;
🩺 Comprehensive medical insurance for you and your partner;
📍 Comfortable office with great facilities in a prime location;
 🎉 Exciting corporate events, team-building activities, and international company parties.

Bold moves start here. Make yours. Apply today! 

BrainRocket is a global company creating end-to-end tech products for clients across Fintech, iGaming, and Marketing. ‍Young, ambitious, and unstoppable, we've already taken Cyprus, Malta, Portugal, Poland, and Serbia by storm. Our BRO team consists of 1,300 bright minds creating innovative ideas and products. We don’t follow formats. We shape them. We build what works, launch it fast, and make sure it hits.

❗️Please note that this role is office-based for Poland, Warsaw.

❗️If you need to be relocated, we take care of the process.

We are looking for a skilled Senior Node.js Developer to join our team in our Warsaw office.

✅ Requirements:

✔️Strong knowledge of JavaScript and the ECMAScript 6 standards;

✔️5+ years of commercial experience with Node.js and Nest.js;

✔️5+ years of commercial experience in web development;

✔️Commercial experience of working with high-load SQL or NoSQL databases;

✔️Commercial experience of implementing the REST, GraphQL, and WebSockets;

✔️Understanding of the TDD principles and experience of writing tests;

✔️Understanding of microservice architecture principles;

✔️Experience of GIT version control system;

✔️Experience with RabbitMQ;

✔️Experience with Redis;

✔️Experience with databases MongoDB, MySQL;

✔️At least an Intermediate level of English.

✅ Will be a plus:

✔️2+ years of hands-on experience developing over CI/CD/Micro Services architecture/Containers;

✔️Experience with Kubernetes;

✔️Experience with Nats;

✔️Experience with TypeScript.

✅ Duties and opportunities:

✔️In-house platform development;

✔️3rd party API integrations;

✔️Actively participate in developing new features from scratch.

✅ We offer excellent benefits, including but not limited to:

🚀 Career growth opportunities in an international and dynamic environment;
📚 Opportunity to develop language skills with partial compensation for language courses;
🎁 Special gifts for birthdays, weddings, and newborns;
🏝️ 20 working days of paid annual vacation, plus paid sick leave;
🍲 Office snacks and refreshments;
🏋️‍♂️ Sports package to support a healthy lifestyle;
🩺 Comprehensive medical insurance for you and your partner;
📍 Comfortable office with great facilities in a prime location;
 🎉 Exciting corporate events, team-building activities, and international company parties.

Bold moves start here. Make yours. Apply today! 

Our Mission and Vision
 

At Solidgate, our mission is clear: to empower outstanding entrepreneurs to build exceptional internet companies. We exist to fuel the builders — the ones shaping the digital economy — with the financial infrastructure they deserve. To achieve that, we’re on a bold path: to become the #1 payments orchestration platform in the world.
 

About the Team and Role
 

As a Node.js Engineer in the Launch Team, you’ll power the backend behind the Digital Onboarding. Our mission is to ensure Solidgate works with compliant merchants while making the onboarding experience fast, seamless, and scalable.
 

You will build the fastest path from “I’m interested” to “I’m live.”
 

Why it’s different

• You’ll reduce Time-to-Live — directly impacting growth.
• You’ll shape the evolving Node.js stack (no legacy drag).
• You’ll design resilient, durable and scalable systems targeting 99.99% uptime.
• You’ll use AI to ship faster and embed AI-powered features into the product.
   

Tech Stack

Launch is one of the first teams driving the Node.js stack at Solidgate.
 

We don’t just adopt tools — we define standards, practices, and engineering culture that other teams follow. What we use:

• Fastify — lightweight, high-performance web server
• gRPC + Protobuf — typed service-to-service communication
• PostgreSQL + Drizzle ORM — reliable data layer with a modern query builder
• Kafka (@platformatic/kafka) — streaming-first, event-driven architecture
• Vitest — unit and functional testing

Plus custom solutions: distributed locks, metrics, streamers, and more.

Explore our full technology stack ➡️ here (https://solidgate-tech.github.io/)

The stack is still evolving — meaning real influence. No legacy baggage. Just modern Node.js running on mature architectural rails inspired by the Golang ecosystem.
 

What you’ll be doing

• Designing a flexible compliance rule engine. You’ll help design a rule engine capable of supporting multiple regulatory frameworks while remaining flexible and easy to adapt as policies change. The system should also be able to detect when rule updates require re-evaluating previously approved merchants and trigger the appropriate compliance workflows.
• Building systems with full traceability. We operate on highly sensitive compliance data, where transparency and accountability are essential. You’ll build systems that provide end-to-end auditability, ensuring every action can be traced.
• Ensuring reliability of mission-critical services. The data produced by this platform powers multiple downstream systems, including financial settlement processes and banking integrations used to open MIDs for merchants. You’ll work on building services that are highly available, durable, and resilient, ensuring the reliability of critical business operations.
• Leveraging AI for smarter document processing. You’ll help introduce GenAI-powered capabilities to streamline document processing and verification flows, reducing manual work for compliance teams and significantly accelerating merchant onboarding.
   

Who you are

• Strong ownership and clear tech POV.
• You ship production-ready systems, not just features.
• 2+ years of Node.js backend experience with solid TypeScript skills.
• Confident with testing (unit/integration/e2e).
• Comfortable with distributed systems principles.
   

Nice to have: GenAI, Next.js, compliance-heavy domains (GDPR/SOC2), Golang experience.
 

Why Join Solidgate?

High-impact role. You’re not inheriting a perfect system — you’re building one.
Great product. We’ve built a fintech powerhouse that scales fast. Solidgate isn’t just an orchestration player — it’s the financial infrastructure for modern Internet businesses. From subscriptions to chargeback management, fraud prevention, and indirect tax — we’ve got it covered.
Massive growth opportunity. Solidgate is scaling rapidly — this role will be a career-defining move.
Top-tier tech team. Work alongside our driving force — a proven, results-driven engineering team that delivers. We’re also early adopters of cutting-edge fraud and chargeback prevention technologies from the Schemes.
Modern engineering culture. TBD, code reviews, solid testing practices, metrics, alerts, and fully automated CI/CD.

💌 The Extras: 30+ days off, unlimited sick leave, free office meals, health coverage, and Apple gear to keep you productive. Courses, conferences, sports and wellness benefits — all designed for ideas, focus, and fun.

Tomorrow’s fintech needs your mindset. Come build it with us.

Company is looking for a Senior Backend Engineer to help build the infrastructure that secures the world’s software supply chains. You’ll work closely with top-tier engineers to design and ship high-performance, secure systems at scale.

This role is a great fit for someone who thrives in fast-moving environments, enjoys solving deep technical challenges, and wants their work to have real impact.

    Responsibilities

• Design, build, and maintain scalable backend services and APIs
• Develop reliable, secure, and high-performance systems in a production environment
• Work with SQL and NoSQL databases to support application needs and performance goals
• Collaborate with engineers to design and improve microservices - based architecture
• Contribute to clean, maintainable codebases and strong engineering standards

• Troubleshoot and resolve complex issues across services and infrastructure

   

  Requirements

• Bachelor’s degree in Computer Science or a related field
• 5+ years of backend development experience building scalable applications
• Strong proficiency in Node.js
• Advanced knowledge of PostgreSQL, Redis, or MongoDB under high load
• Familiarity with cloud services and microservices architecture: must have experience breaking down monolithic applications into microservices.
• Excellent problem-solving skills and a commitment to clean, maintainable code
• Proven track record of solving performance bottlenecks in high-volume data systems.
• Experience with SAST, SCA, or relevant security tools.

Moon Active is one of the world's top mobile game companies, our teams leverage cutting-edge technologies to craft fun and interactive games enjoyed by millions worldwide. We produce exciting and engaging entertainment for players across the globe and pride ourselves on developing top-quality casual games that invite and allow players to connect with one another.

As a BackEnd Developer, you will be working in a scrum team implementing new features and improving existing code for our most popular game. We are looking for a Strong developer to join an engineering team that is responsible for building complex, high-scale, and real-time systems.

We work with Node.js/Redis/Neo4j/K8s/Microservices, 24/7 serving 100k req/sec, 200k+ req/sec at peaks, Redis used as the main storage, handling terabytes of data and 200M ops/min.
 

Responsibilities:

• Delivering new game features every few weeks;
• Building distributed systems and microservices;
• Mainly developing real-time mobile game server with Node.js and Redis;
• Working with the Kyiv-based cross-functional team that also includes Unity developers and QAs.

Requirements:

• Backend development experience (any OOP language, ex. Node.js, Java, C#, etc.);
• Familiarity with Node.js - advantage;
• Willingness to operate within an AI-first approach for development productivity and feature integration;
• Experience with distributed systems and microservices architecture;
• Experience with NoSQL databases (ex. Redis);
• Experience with Backend development of real-time web services;
• Experience in a high scale system will be a plus;
• Experience working with Scrum teams will be a plus;
• Good spoken and written English is a MUST.

Benefits:

Why join Moon Active? 

• Be part of a leading global mobile gaming company with a unique product enjoyed by millions;
• Thrive in an exceptional, innovative, and dynamic environment;
• Enjoy full transparency and open communication with talented colleagues across teams;
• Take advantage of tremendous opportunities for professional growth and career advancement within a rapidly expanding company;
• Influence and help build personalized product experiences that impact millions of users worldwide.

We offer:

• Generous compensation; paid vacation and sick leave;
• Extensive medical and life insurance coverage for you and your family;
• CrossFit & running classes at the office and MultiSport card;  
• Comfortable and modern office located on Królewska 16 street in Warsaw;
• Free daily breakfasts and lunches, and a fully stocked kitchen with snacks and fruits;
• Latest tech equipment, including macOS devices;
• Training & Development/Tuition reimbursement;
• Friend Referral Program with generous bonuses;
• Fun and collaborative workplace culture with regular Friday Happy Hours and team gatherings;
• Relocation bonus for candidates moving to Warsaw;
• Bicycle and Car parking.

We Play to Win! We Play it Smart! We Play as a Team!

We are committed to investing in our employees and fostering a workplace that champions innovation, creativity, and collaboration. At Moon Active, we empower our team members to unleash their potential and achieve remarkable results every day. We encourage bold decision-making and believe that every individual has a significant impact on our success. Join us and level up your career in a supportive and high-achieving environment!

SKELAR — це venture builder, який будує міжнародні продуктові IT-компанії за правилами світу венчурних інвестицій. Разом із ко-фаундерами збираємо сильні команди, щоб запускати продуктові IT-бізнеси та перемагати на глобальних ринках.

Зараз ми в пошуку Middle/Senior Backend Engineer до нашої партнерської компанії.

Це платформа для особистого та духовного розвитку, що створена на основі християнських цінностей.
Ми допомагаємо людям знаходити відповіді на найважливіші питання в житті: від глибшого розуміння віри до покращення стосунків з близькими завдяки персоналізованим планам. Наші користувачі отримують доступ до уроків, інтерактивних опитувальників та відеоматеріалів, що створюють цілісний досвід навчання.

Наша стратегія — стати глобальною платформою, де зможуть взаємодіяти десятки мільйонів християн, сотні організацій та тисячі наставників і пасторів.

Ключові досягнення, якими ми пишаємось:

• Користувачі люблять нас: середня оцінка в App Store, Google Play та Trustpilot — 4.7/5.
• Ми стрімко зростаємо: лише за останній рік команда збільшилася в 4 рази.
• Ми є партнером Meta, що підтверджує високий рівень нашого продукту та довіру технологічних лідерів.

Ми розвиваємося з неймовірною швидкістю, і кожен член команди має можливість швидко рости разом із компанією — як професійно, так і особисто. Компанія підтримує навчання через менторинг, внутрішні освітні ініціативи та доступ до зовнішніх курсів.

Окремо варто підкреслити: ми широко інтегруємо AI-інструменти у всі процеси. Ми вже використовуємо інтеграції з MCP-серверами у повсякденних інструментах, AI Code Review та автоматизацію ключових рутинних задач. Це дозволяє нам зосереджуватись на креативності та інноваціях, а не на рутині.


Hard skills:

— 3+ років комерційного досвіду з Node.JS;
— Досвід проєктування надійних і масштабованих систем обробки повідомлень (черги, retry-механізми, idempotency);
— Досвід роботи в хмарних середовищах (AWS / GCP);
— Досвід роботи з Docker, створення CI/CD пайплайнів (Github Actions, etc.).

Will be a plus:

— Досвід роботи з Task Schedulers (BullMQ, EventBridge, etc.);
— Досвід роботи з системами для Observability та Alerting (Prometheus, Grafana);
— Знання і практичний досвід з інструментами Infrastructure as Code (Terraform);
— Досвід інтеграції no-code / low-code сховищ (Airtable).

Soft Skills:

— Овнершип повного циклу розробки — готовність брати участь у всіх етапах, від ідеї до продакшн-релізу, а не обмежуватися виконанням окремої складової;
— Тісна співпраця з маркетинг-командою — уміння занурюватися в бізнес-контекст і разом знаходити можливості для автоматизації та масштабування;
— Орієнтованість на рішення — здатність приходити з пропозиціями щодо рішень, а не лише підсвічувати проблеми;
— Постійний розвиток — прагнення вдосконалювати власні знання й навички та застосовувати їх у практичних проєктах;

Tasks:

— Розробка та підтримка системи автоматизації creative production за допомогою AI, яка передбачає генерацію ідей, створення креативів, їх пост-аналіз.

— Побудова і розвиток рішень для автоматизації менеджменту реклами в Google Ads, TikTok Ads

— Покращення та масштабування in-house платформи для створення та керування рекламою в Meta (Facebook) Ads

Ти працюватимеш у команді з досвідченими інженерами, продакт-менеджерами та аналітиками. У нас — культура колаборації, постійного розвитку та високі стандарти якості.

Що ми пропонуємо:

— Роботу над продуктом, що змінює життя людей і допомагає мільйонам християн у світі.
— Можливість впливати на розвиток продукту на ранніх стадіях масштабування.
— Сильну команду, яка допомагає рости та розвиватись.
— Можливості для навчання: обмін досвідом з Senior-інженерами інших успішних проєктів екосистеми, внутрішні школи та освітні події, 13 професійних комʼюніті, а також можливості відвідувати різноманітні зовнішні курси;
— Комфортні офіси в Києві та Варшаві, та один з найкращих пакетів бенефітів на ринку: страхування, 20 робочих днів відпустки, обіди та сніданки тощо.

На звʼязку команда expla 🤟

Ми займаємось performance-маркетингом з 2015 року. Якщо просто: ми допомагаємо великим IT-продуктам знаходити «своїх» людей по всьому світу. Ми не дуже любимо гучні епітети, але цифри кажуть, що ми на правильному шляху:

• входимо в топ-100 клієнтів Google у Європі,
• привели понад 60 млн користувачів для наших партнерів,
• ми - ключовий партнер для рекламодавців у США, Канаді та Великій Британії.

Але найбільша гордість - наші люди. Завдяки їхнім відгукам ми увійшли в топ-3 продуктових компаній за версією DOU у 2026 році!

Наша команда відповідає за всі внутрішні маркетингові сервіси: трекери, аналітики, оптимізатори і тд. Ми шукаємо Full-Stack Developer, що буде розробляти новий функціонал, масштабувати існуючі рішення та брати участь у проектуванні архітектури платформи.

It’s a match, якщо ти маєш досвід з:

• TypeScript / Node.js
• NestJS
• Angular
• PostgreSQL / TypeORM
• ClickHouse
• Redis
• AWS (SQS, S3, Secrets Manager, etc.)
• Monorepo (Nx)

Буде плюсом, якщо маєш: 

• досвід роботи з highload / adtech / martech-проєктами,
• розуміння принципів роботи трекінгу та атрибуції трафіку,
• досвід роботи з message brokers (RabbitMQ / SQS / AMQP),
• досвід роботи з Redis caching / queues,
• досвід роботи з Terraform або іншими IaC інструментами.

Які челленджі на тебе очікують:

• проектування та розробка highload-сервісів для обробки трафіку,
• пптимізація продуктивності та масштабування сервісів,
• підтримка та розвиток існуючих інструментів системи.

Що ми пропонуємо:

• стабільність: винагорода у $, яка завжди вчасно,
• відпочинок: 20 днів відпустки + 1 додатковий день за кожний рік, що ми разом,
• турбота про тебе: медичне страхування та 100% оплата лікарняних,
• свобода вибору з Benefit Cafe: щомісяця ми даємо тобі бюджет, який ти витрачаєш на свій розсуд - на англійську, спорт, психолога чи навчання. Ти сам вирішуєш, що тобі зараз важливіше,
• довіра: у нас гнучкий графік і немає трекерів часу. Ми віримо у твою відповідальність,
• офіс, де все включено: сніданки, обіди, свіжі фрукти та власний спортзал. Ми подбали про побут, щоб ти міг фокусуватися на своїх задачах,
• безпека: наш офіс має укриття та забезпечений всім необхідним на випадок блекаутів: від генератора до спальних місць.

А ще у нас цікаво: в expla діє крута система гейміфікації: за свої успіхи та активність ти отримуєш внутрішню валюту, яку можна обміняти на класні подарунки (від мерчу до техніки) у нашому expla shop.

Ми також віримо, що бізнес має допомагати. У нас є проєкт expla for victory, завдяки якому ми задонатили на ЗСУ вже понад 20 млн грн і продовжуємо підтримувати важливі ініціативи.

Нумо перформити разом - ставай частиною expla!
Чекаємо на твоє CV!