Back-end developer jobs in Poland

 ...& Qualifications A minimum of 3+ years of proven, successful professional software engineering history operating as a Backend Developer, Systems Engineer, Node.js/Python Specialist, API Integration Architect, or closely matching technical capacity inside production... 

About Nethermind Nethermind is a blockchain research and software engineering company building high-performance infrastructure, security tooling, and cryptographic systems across the Ethereum ecosystem and beyond. We work closely with protocol teams, L2s, and ZK projects...

 ...metrics, and capture more global revenue. Backed by world-class venture institutions—...  ...role demands a seasoned distributed systems developer who can deal thoughtfully with inheritance...  ...independently manage technical feature direction end-to-end, considering automated monitoring... 

 ...Software as a Medical Device (SaMD) ECG diagnostics portal. You will handle everything from high-performance data ingestion to modern front-end rendering. What You'll Do Design and build high-performance backend microservices and RESTful interfaces. Integrate complex... 

 ...About This Role We are looking for a Senior Shopify Full Stack Developer with deep expertise in the Shopify ecosystem, a strong grasp of...  ...stack applications with Shopify as the backend and modern front-end frameworks (Next.js, Remix, React, etc.) in a headless configuration... 

 ...grade workflows. This includes designing how agents operate, fail, recover, and deliver consistent value to users. Focus Build end-to-end product features across frontend, backend, and AI integrations Design agent workflows that handle planning, tool use, failure... 

 ...quality by testing new features, identifying defects, creating automated tests, recommending process and product improvements, and developing strong feature and product knowledge. Key Responsibilities Perform thorough functional, integration, API, regression, and... 

 ...user experience through curated editorial coverage and award-winning video segments like Honest Trailers. Fandom equips high-agency developers with an uncompromised software canvas to engineer highly interactive web elements, scale asynchronous messaging pipelines, and... 

 ...risk teams and other engineering teams , you will effectively manage loans throughout the delinquency phase of their lifecycle and develop and implement recovery strategies. We are looking for a highly motivated software engineer to build the next generation platform solutions... 

About A1 There are over 5 billion users using basic applications today such email, notes, tasks that are not AI-native. Our mission is to build a proactive smart assistant for everyday users to bring intelligence to conversations, errands, organising and workflows, with...

 ...work for our client from banking sector. Responsibilities: Develop and maintain scalable frontend applications using React 19 and...  ...with Zod . Ensure software quality through unit, integration, end-to-end, accessibility, and visual regression testing using... 

 ...leading engineers on your team through ambiguity to solve open-ended problems, and ensuring that everyone is supported throughout delivery...  ...your team through your writing and tech talks. You will help develop talent on your team by providing feedback and guidance, and... 

Altoros - a leading IT services provider is looking for a **Unity Support Engineer. **!Part-time position. Responsibilities: Regularly review Unity SDK release notes on a monthly basis and: Identify and flag breaking changes that may impact integration with...

 ...technical leadership role at the intersection of QA and mobile development, driving a native-first testing strategy and a culture where developers own quality rather than hand it off. Your scope of work will cover 3 areas. I. Test strategy & native automation Design... 

About Nethermind Nethermind is a blockchain research and software engineering company building high-performance infrastructure, security tooling, and cryptographic systems across the Ethereum ecosystem and beyond. We work closely with protocol teams, L2s, and ZK projects...

 ...healthtech, collaboration technology, and gaming industries. Backed by multiple gold accolades at the Employer Brand...  ...seeking a highly analytical, systems-minded Middle Java Developer to join our expanding back-end engineering division in a remote-first capacity. In this... 

About Nethermind Nethermind is a blockchain research and software engineering company building high-performance infrastructure, security tooling, and cryptographic systems across the Ethereum ecosystem and beyond. We work closely with protocol teams, L2s, and ZK projects...

 ...cost savings, maximize operational efficiency, and drive data-backed decision-making. As the definitive global market leader for air...  ...Responsibilities Production-Grade AI Systems Architecture: Design, develop, and scale advanced AI-driven backend services that power... 

Summary The Wikimedia Foundation is seeking a Senior Software Engineer to join the team supporting the Wikidata Platform — the structured data backbone of Wikimedia projects and a key part of the global open knowledge ecosystem. You’ll help scale and sustain the Wikidata...

 ...The Role Lead a team of senior full-stack developers and coordinate technical execution across...  ...complex user interfaces Own projects end-to-end — from requirements and...  ...Health Insurance Reimbursement: We have your back—literally! Receive reimbursements to help... 

 ..., absolute code ownership, and AI-driven process acceleration as foundational pillars. The platform provides high-agency backend developers with an uncompromised remote canvas to leverage modern containerized tech stacks, manipulate complex relational databases, and build... 

Responsibilities Design, build, and maintain automated UI tests for web and mobile applications. Execute exploratory and manual testing to validate new features, edge cases, and customer journeys. Collaborate closely with frontend and mobile engineers throughout...

Are you passionate about shaping innovative digital products that drive real impact? GetResponse is seeking a dynamic and driven Product Manager to join our team. As a leader in the industry, we are continually looking to expand our product offerings and enhance the overall...

 ...organization. Implemented and monitored data quality controls to improve data accuracy and reliability. Defined and maintained end-to-end data lineage to support regulatory and business requirements. Collaborated with business and technology stakeholders to strengthen... 

Building the Future of Open Finance Payward - the parent company behind Kraken, NinjaTrader, Breakout, xStocks, Payward Services and CF Benchmarks - has spent the last 15 years building one of the most modern and globally accessible financial infrastructure platforms ...

 ...product hypotheses. ~ Exceptional stakeholder management and verbal communication mechanics to influence cross-functional technical developers and corporate sales leaders. ~ Location Scope: 100% remote eligibility open to senior product leaders based inside Poland .... 

 ...background to join our core R&D team. In this multi-faceted role, you will serve as a principal System Investigator, taking ownership of end-to-end and system-level validation across our communication infrastructure. Moving far beyond trivial manual interface testing, you... 

About Gcore: The world’s digital experiences run on something invisible: the infrastructure and software that keep them fast, reliable, and secure. At Gcore (gcore.com), you’ll help design and deliver that foundation for an AI-driven world. We are a global provider of...

 ...impressive 8-year track record—delivering over 300 successful games through the collaborative hearts and minds of more than 200 developers. We craft cutting-edge entertainment and betting products for over 100 international clients, operating cross-functional corporate... 

 ...mandated daily working overlap alongside 9am-5pm CST business hours. Key Responsibilities Direct Response Video Governance: Develop, piece together, and produce high-quality, conversion-optimized Direct Response video ads for e-commerce and digital product lines...