905 backend developer English-speaking jobs in Warsaw

Tech stack React + TypeScript on the frontend, Ruby on Rails on the backend, some Node/TypeScript services ... Our client is a well-established B2D (business-to-developer) SaaS platform -real-time infrastructure ... You have natural empathy for other developers and genuinely care about the developer experience of the ... concept to shipped and monitored in production — dashboards, billing UIs, documentation platforms, developer-facing

As a Senior Angular Developer with Java Skills you will be working for our client, a leading international ... , test and implement software aligned with architecture and regulatory standards.Build and maintain backend

embark on this thrilling journey with us.Your Role:We’re on the lookout for a skilled Senior Frontend Developer ... React, Typescript and Tailwind CSS based on design delivered from our UI/UX Designers.Collaborate with backend ... opportunities.Make an impact by optimizing and scaling innovative systems.If you’re ready to take your backend

The Role We are looking for a Senior or Expert Java Developer to design, build, and modernize backend ... requirements-expected : Experience: Min. 5 years (for Senior) or 10+ years (for Expert) of Java backend

If you are a highly adaptable developer who naturally leverages AI tools to accelerate delivery and loves ... We’re growing fast and looking for an AI-First Backend Engineer to join our Core Team and play a key ... Requirements 3+ years of experience in backend software engineering within a fast-paced product company ... ’d love to meet you Responsibilities Design, build, and maintain efficient, reusable, and reliable backend

hands‑on experience in machine learning / AI solutions.Key ResponsibilitiesDesign, build, and maintain backend ... Python Developer – Banking Domain with ML/AI ExpertiseLocation: Poland (Tricity / Warsaw / Łódź - 3 days ... Seniority: Mid / SeniorEmployment Type: Full-timeAbout The RoleWe are looking for an experienced Python Developer

extension plannedScopeDesign, develop, and maintain fullstack applications with a strong emphasis on backend ... authentication flows.Maintain and update technical documentation.Participate in internal and external developer

business flows and volumes projected through 2027–2029.The RoleWe are looking for a Senior or Expert Java Developer ... to design, build, and modernize backend integration components for a core Safekeeping and Corporate ... bottlenecks occur.ExpectationsExperience: Min. 5 years (for Senior) or 10+ years (for Expert) of Java backend

technologies-optional : AWS about-project : We are looking for a talented and passionate Fullstack Mobile Developer ... and processes high volumes of transactions through a combination of mobile applications, distributed backend ... demanding environment, requiring modern software architecture, seamless integration between mobile and backend

Ability to read backend Java code is a plus. ... Work with backend systems via REST APIs and data streaming. ... TypeScript API technologies-optional : Java Electron OpenFin about-project : Are you a skilled React developer

Develop platform software such as operators, controllers, and backend services to manage and automate ... Track record of building automation or self-service tools that improve developer productivity. ... Strong communication and collaboration skills, with a focus on developer experience and supported adoption ... features using Kubernetes-native interfaces, automation pipelines, and reusable tooling to streamline developer

Responsibilities Reference 26000BN5 Join our Fixed income, Forex and Credit (FFC) teams as a C# Developer ... Requirements You have minimum 3 years of professional experience in C# backend development You know

This is a backend-oriented engineering role where you will influence the core business logic that connects ... Strong programming skills in at least one modern backend language, with the readiness to work primarily ... AI agent capabilities with everyday developer workflows. ... Are you a senior software developer who views LLMs not as a magic fix, but as components of a larger, ... A strong focus on the developer experience, understanding what makes an integration feel seamless or

Integrate with our existing backend by consuming data via our GraphQL API. ... We’re Looking For Senior Android Developer to lead the development of our new native Android application ... Collaborate closely with iOS developers, backend engineers, designers, and product managers to understand ... What We’re Looking For Proven experience as a Senior Android Developer with a strong portfolio of shipped

You’re a developer who values user‑centric design, precision, and seamless collaboration. ... Senior Backend Engineer – SumUp Join to apply for the Senior Backend Engineer role at SumUp. ... What You’ll Thrive In 5+ years experience in backend engineering with Java and/or Kotlin. ... About The Role You will be working on secure backend systems to ensure our SumUp’s Point of Sale (POS ... As a Senior Backend Engineer, you’ll collaborate with a dynamic, cross‑functional team of Product Managers

of recruitment projects we undertake for our partners, we are currently looking for: Senior Frontend Developer ... Analyze and optimize application performance, including load times and Core Web Vitals Collaborate with backend

resolution, run post‑mortems and drive systematic remediation Contribute platform tooling that improves developer ... pipeline reliability, and change management processes Participate in the on‑call rotation alongside backend ... experience and reduces infrastructure toil Keep backend engineers informed and capable – no silos, shared ... major infrastructure migration – planned, executed, and stabilised it Python and/or Go familiarity – backend

Contribute platform tooling that improves developer experience and reduces infrastructure toil. ... Participate in the on‑call rotation alongside backend developers. ... Python and/or Go familiarity – backend is Python, edge services are Go. ... Keep backend engineers informed and capable — no silos, shared infrastructure ownership.

mentoring junior developers.Identifying technical risks and proposing mitigation strategies.Optimizing backend ... Prometheus, Grafana).Experience in integrating with external systems and queuing systems.Ability to optimize backend ... occasionally visit the client's office in Warsaw.Main responsibilitiesDesigning, implementing, and maintaining backend

development mindset: Comfortable utilizing AI tools to accelerate delivery, while maintaining strong developer ... modern cloud architectures.ResponsibilitiesBackend & Pipeline Development: Design and develop scalable backend ... code, robust testing (unit/integration), automation, and security.Requirements8+ years of professional backend