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A senior backend developer designs, builds and evolves REST APIs in .NET Core 8 (C#) for a demanding financial environment, contributing to architecture decisions, code reviews and mentoring junior profiles, with a small legacy VB.NET modernization component. Hybrid on-site role in Madrid with 2 remote days per week.
Senior Backend Developer building and evolving REST APIs in a demanding financial environment, combining hands-on development with technical design, code reviews, and mentoring of junior profiles. Core stack: C#, .NET Core 8, Entity Framework, SQL Server, Git, and OpenAPI/Swagger, with hybrid work (2 remote days).
Senior backend developer at Raona (a Microsoft-focused digital transformation consultancy) who maintains and improves legacy Visual Basic applications while gradually migrating their functionality and business logic to modern technologies like C#/.NET. Day to day involves analyzing legacy systems, refactoring code, and collaborating with technical teams for a stable transition.
Senior Backend Developer improving the core PHP API behind a B2C healthtech app used by millions daily, strengthening scalability and contributing to a migration from PHP to Go. Fully remote role for candidates based in Spain, Portugal, Germany or the UK.
Senior Backend Developer improving the PHP API behind a consumer health app used by millions of people daily, handling hundreds of millions of requests per day, while helping migrate the backend toward Go. Remote role open to candidates based in Spain, Portugal, Germany, or the UK, with a salary of up to €90,000.
Senior Python backend developer who designs, builds, tests, and deploys high-performance distributed services and batch processing pipelines end-to-end. Core stack: Python, relational databases (SQL Server/Oracle/PostgreSQL), CI/CD, messaging (Kafka/TIBCO/MQ), cloud (AWS/Azure/GCP), Docker/Kubernetes, in an international financial trading/risk environment.
Senior Python backend developer for a banking-sector project at Hasten Group: designing, building and maintaining high-performance distributed backend services and batch pipelines, with automated testing, CI/CD (Jenkins/GitHub Actions) and production incident/root-cause analysis. Role is 100% remote from Madrid, Spain.
Senior Python developer joining a backend platform team, owning services end to end — designing, building, testing and deploying high-performance distributed services and batch pipelines through to production support. Core stack is Python with relational databases and CI/CD, on a project with a strong financial/regulatory (trading, risk, FRTB) flavor.
UST is hiring a Senior Python Backend Developer (7+ years) to build REST APIs and microservices using FastAPI, Django, and Flask. The role involves hands-on backend development, performance monitoring and troubleshooting with AppDynamics, database work (PostgreSQL/MySQL/MongoDB), and Git/CI/CD in an Agile environment.
Senior Backend Engineer on bsport's Community & Engagement team, building and scaling the backend behind marketing campaigns, workflow automation, SMS/email/push messaging, and member data for fitness studios worldwide, including re-architecture and agentic AI initiatives. Works in an OO backend language (Python/Django a plus) on scalable systems and APIs, hybrid from Barcelona.
Senior backend engineer who builds the production platform behind OMMAX's agentic AI customer solutions: designing scalable APIs, async workflows, queues, and distributed services in Python/TypeScript, creating orchestration for LLM agents (tool calling, state, approvals), enterprise integrations, plus observability and evaluation tooling.
Are you a Backend Dev Senior for AI in Madrid seeking a new interesting challenge? If your answer is yes, it’s your lucky day so keep reading, it can be just what you're looking for! ✍️ WHAT WILL YOU DO? We are…
Builds and continuously modernizes Java-based backend applications at BarmeniaGothaer, a German insurance group, taking technical ownership from concept through production. Core stack is Java/Java EE and Spring Boot, with Angular, full-stack work, and Camunda/workflow tools as pluses.
Senior back-end developer at Caseware, a Canadian accounting/audit software company, based in Cluj, Romania. The role is a technical leadership position: shaping back-end architecture, mentoring engineers, improving CI/CD and reliability, and using AI-assisted/agentic development tools daily. Core stack is Java, Spring Boot, and AWS.
Senior backend developer at Bitfinex, a cryptocurrency trading platform, building Node.js/JavaScript backend services for the trading app, Bitfinex Pay, Lightning Network support, and blockchain integrations. Work focuses on scalability, low-latency APIs, and security in a microservices architecture, fully remote worldwide.
Senior backend developer designing and building enterprise applications on AWS with Node.js, NestJS, and TypeScript. Day-to-day work spans MongoDB Atlas, event-driven architecture (MSK/Kafka, EventBridge), contract-first APIs, CI/CD pipelines, and reviewing AI-generated code.
Builds scalable backend services in Java/Spring Boot for Rightmove’s property platform, using Kafka, Elasticsearch, and Couchbase to power millions of users and agents.
Senior backend engineer on Wise's Global KYC & Onboarding squad in Hyderabad, owning end-to-end customer verification systems. Day to day: designing scalable Java/Spring microservices, Kafka/RabbitMQ messaging, database optimization, and integrations with risk and compliance systems to keep global onboarding reliable and compliant.
Senior backend engineer at crypto exchange Bybit in Kuala Lumpur, acting as a Module Owner for wealth-management backend systems: designing and building services in Golang, optimizing MySQL, and using Redis/Kafka for caching and async messaging, plus monitoring and code reviews.
Senior backend developer building and running service-oriented Java/Spring Boot backends for ACTAPORT, a SaaS practice-management platform used by over 1,000 German law firms. Day-to-day: designing stable REST APIs, SQL data modeling and query optimization, Kubernetes operations with observability, and integrations like beA and Microsoft 365.
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