April 25, 2026
Principal Backend Engineer (Node.js, PHP)
Senior • Remote
27,000 - 40,500 PLN
Krakow, Poland
Join our Integrations team and help build a robust, scalable platform that connects our AI-powered translation and localization tools with hundreds of services our customers rely on daily. This is more than coding—it’s about architecting a system that makes workflows effortless, developer experience smooth, and enables product teams to deliver value faster.
✅ Your responsibilities:
Lead design, development, and long-term ownership of the integrations platform and services.
Build scalable, multi-tenant systems using Node.js, PHP, microservices, and a PHP monolith.
Implement API integrations, webhooks, polling mechanisms, message queues, and event-driven architectures.
Improve development lifecycle, CI/CD, testing, observability, and operational excellence.
Mentor and elevate team skills through code reviews, knowledge sharing, and technical guidance.
Pioneer AI-powered development workflows and tools within the team.
🧠 Our requirements:
7+ years building and maintaining complex backend systems.
Strong experience with Node.js and PHP, modern services, and monolithic architectures.
Proven experience in integrations: API versioning, message queues, event-driven architectures.
Solid understanding of APIs, relational databases (e.g., PostgreSQL), and cloud services (AWS or similar).
Strong judgment in system design and technical decision-making (PoCs, RFCs/ADRs).
Commitment to testing, observability, operational excellence, and high-quality code.
Experience with AI-assisted development tools (e.g., GitHub Copilot, Cursor).
Excellent problem-solving, communication, and leadership skills.
🌟 What we offer:
Stable employment in a fast-growing company
Flexible and remote-friendly working model
Health and wellbeing benefits
Continuous learning and development opportunities
Modern equipment and comfortable work environment
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Hybrid
Stockholm, Sweden
🏢 Summary: Senior Integration Engineer role focused on designing, building, and optimizing scalable integrations between a business-critical SaaS platform and external systems. The assignment combines hands-on development with architectural improvements and standardization of the integration landscape. The consultant will enhance integration practices, frameworks, and cloud-based services in a modern product-driven environment. 🗂️ Requirements: 5-6+ years software development experience, Minimum 2 years in integration-focused role, Strong knowledge of APIs and distributed systems, Experience with event sourcing, Experience building scalable integration services, Experience integrating ERP and/or Payroll systems, Proficiency in at least one OOP language (Java, Kotlin, or C#), Experience with Node.js, React, or TypeScript, Experience with PostgreSQL or MongoDB, Experience with AWS, Azure, or GCP, Experience with integration frameworks (Apache Camel, JBoss Fuse, Azure Logic Apps, or iPaaS), Experience using AI tools in development workflow 📃 Skills: APIs, DistributedSystems, EventSourcing, Integration, ERP, Payroll, Java, Kotlin, C#, OOP, Node.js, React, TypeScript, PostgreSQL, MongoDB, AWS, Azure, GCP, ApacheCamel, JBossFuse, AzureLogicApps, iPaaS, AI 🏢 Description: Location: Remote with occasional visits to the office in Stockholm Start: ASAP/or after the Summer Duration: Initial 6 months About the Assignment We are looking for a highly experienced Integration Engineer to join a product-focused technology organization undergoing continued growth and modernization. The assignment focuses on designing, building, and optimizing integrations between a business-critical SaaS platform and a broad ecosystem of external systems. The consultant will play a key role in both hands-on development and strategic improvements of the client's integration landscape. This is a senior-level role where the consultant is expected to actively contribute to development while also helping elevate engineering practices across the team. Responsibilities Design, develop, and maintain integration solutions between internal and external platforms. Evaluate and assess the existing integration architecture and provide improvement recommendations. Drive standardization, scalability, and maintainability across integration services. Collaborate closely with engineering, product, and business stakeholders. Contribute to architectural decisions and integration best practices. Support the development of reusable integration patterns and frameworks. Mentor team members and help strengthen the team's technical capabilities. Leverage modern AI-assisted development tools and workflows to improve productivity and quality. Required Experience A passionate professional with a solid technical understanding of concepts such as APIs, distributed systems, event sourcing, and integrations, with at least 5-6 years of experience as a developer including at least 2 years in an integration-focused role. Proficiency in building scalable integration services, preferably with systems such as ERP and/or Payroll. Fluency in at least one OOP language such as Java, Kotlin, or C#, with experience across frontend (preferably Node.js, React, or TypeScript) and databases (preferably PostgreSQL or MongoDB). Experience working in cloud environments like AWS, Azure, or Google Cloud. Familiarity with integration frameworks like Apache Camel, JBoss Fuse, Azure Logic Apps, or iPaaS solutions. Track record of leveraging AI tools in your development workflow. Strong attention to detail and the ability to deliver stable, scalable integrations. Strong analytical abilities and excellent communication skills. Nice to have Experience in identity and access management. Experience in the HRIS domain, HR master data, HR systems, payroll data, and employee and organizational data. Experience working with remote teams across multiple countries. Personal Qualities Highly hands-on and delivery-oriented. Comfortable operating both strategically and technically. Strong problem-solving and analytical mindset. Passionate about engineering excellence and continuous improvement. Ability to challenge existing approaches and drive positive change.