B2B
Fully Remote, Poland
SENIOR SOFTWARE ENGINEER (Node.js / React)
Who we are - and why you might want to join us?
We’re a software development company based in Kraków, working with international clients from industries like foodtech, construction, fintech, real estate, or healthcare. Over the last 15+ years, we’ve delivered 150+ digital products - from web and mobile apps to complex platforms and MVPs.
We work in small, cross-functional teams, combining business and tech expertise. Some of us have been here for 5, 8, even 13 years - and we’re still growing!
What connects us? A pragmatic approach to software development, a curiosity for new technologies, and a culture of collaboration. We value autonomy, clear communication, and doing things the right way.
👉 Looking for a place where you can grow, have a real impact, and enjoy what you do?
Join us and be the architect of our success stories! 👈
SENIOR SOFTWARE ENGINEER (Node.js / React)
Backend-focused Full Stack
[ Fully Remote ]
About Project
You will join a mission-critical project for one of our established US-based clients (with a minimum 7-month engagement).
The project involves the evolution of a high-precision spatial computing platform operating at the intersection of ConTech and FinTech. The system is responsible for precise spatial calculations and automated cost estimation for multi-million dollar construction investments.
This is not your typical greenfield project. Your main challenge will be the evolution of a powerful, mature ecosystem. This role requires a genuine passin for reverse engineering and the ability to navigate skillfully through complex legacy code.
Tech Stack & Proportions:
- Backend (~80%): Node.js, Amazon Aurora PostgreSQL, Distributed Systems (Microservices, Event-driven)
- Frontend (~20%): React
The Core of the Role:
- Approximately 60% of your effort will involve deep-dive analysis- reading advanced code, reverse-engineering hidden business dependencies, and optimizing the computational algorithms that form the system's foundation.
- React and Node.js are merely tools here. The heart of the system lies in the powerful mathematical logic embedded within 2D/3D geometry and coordinate systems.
- While the project utilizes Canvas API and WebGL, a dedicated, separate team is responsible for the core rendering engine itself. Your role involves only minor display adjustments – the real focus is on the backend data logic.
- As a Senior Fullstack Engineer, you will join a stable, non-startup environment, collaborating closely with long-tenured domain experts to navigate technical decisions without the typical greenfield chaos.
Key Responsibilities:
- Building and optimizing precision algorithms for spatial measurements (surfaces, dimensions, 2D/3D geometry) and automated cost estimation
- Delivering features across the entire stack, from database schemas (Aurora PostgreSQL) and Node.js microservices to React on the frontend
- Optimizing data processing and rendering logic to ensure a smooth, high-performance user experience when handling large-scale architectural datasets
- Analyzing, refactoring, and improving a mature, production-proven codebase to enhance system maintainability and scalability without breaking existing functionalities
- Ensuring absolute calculation correctness by writing solid tests and participating in a Code Review process
Sound like something for you? Send us your CV-- we’re excited to meet you!
What’s next?
- Initial Call: If your profile aligns with our needs, we’ll invite you for an online call.
- Tech Interview We’ll invite selected candidates for a technical interview to assess specialist knowledge.
- Client Meeting; Live Coding: Imperative programming task from scratch (multidimensional matrices, boundary logic) testing pure logic and spatial thinking (no UI/frameworks)
- Feedback
- Offer & Hire: If everything clicks, we’ll send you a complete offer with all the details.
*Note: Depending on the specific case, an extra step might be added to the process.