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Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Software Engineer (Payments) - **Company:** Kingmakers - **Location:** Madrid, Spain (Remote available) - **Contract:** Permanent contract - **Skills:** .NET Framework, Microsoft Azure, C Sharp (Programming Language), Cloud Computing, Code Review, Continuous Integration, Relational Databases, Microsoft SQL Server, MongoDB, NoSQL, Redis, Software Engineering, Azure Service Bus, .NET Core, Caching, Backend, Event Driven Architecture, Containerization, Git Flow, Kubernetes, Apache Kafka, Restful APIs, Terraform, Grpc, Docker, Legacy Systems, Microservices - **Published:** July 17, 2026 - **Apply:** https://www.adzuna.es/contact-us.html ## About the Role + Strong experience delivering production-grade software, with end-to-end ownership of features and services + Solid C# / .NET (or .NET Core) development skills - our core backend language + Strong SQL Server and RDBMS skills; experience with MongoDB or other NoSQL technologies too + Experience building and consuming REST APIs and gRPC services + Familiarity with event-driven systems and messaging - Kafka and/or Azure Service Bus experience is a strong plus + Experience working with Azure cloud infrastructure and modern CI/CD practices + Familiarity with Redis for caching and Terraform for Infrastructure as Code is a plus + Containerisation experience (Docker / Kubernetes) is a plus + Experience in payments, fintech or high-volume transactional systems is a strong advantage + Comfortable working in a fast-moving, distributed team environment + Strong written and verbal communication: you can articulate technical decisions clearly We operate in a real-time, high-volume transactional environment. Our stack includes: + C# / .NET / .NET Core + SQL Server plus a mix of RDBMS + MongoDB + Event-driven systems and messaging (Kafka and Service Bus) + Microservices, REST APIs and gRPC + Azure cloud infrastructure + Git workflows and modern CI/CD practices + Redis for caching + Terraform for Infrastructure as Code + Containerisation with Docker / Kubernetes (strong plus) ## Description We are not maintaining legacy systems: we are scaling a live, revenue-driving technology platform in real time. About the Role Payments is our critical path to growth. No new market goes live without it. Every deposit, withdrawal and transaction (across every country we operate in) runs through the systems this squad owns. As we expand geographically, the complexity scales with us: more markets, more payment providers, more regulatory environments, more transaction volume. This is not a low-impact role. You'll work on financially critical infrastructure operating at scale across multiple markets, where reliability, correctness, and performance are non-negotiable, and where your engineering decisions have direct consequences for players and the business in real time. You'll be a productive, end-to-end contributor within the squad, engaging across the full software development lifecycle, from design and implementation through to production ownership. What you'll be doing + Design, build and maintain payment processing services and integrations with third-party payment providers, PSPs and financial networks + Own features end-to-end: from technical design through delivery, testing, monitoring and production support + Work with event-driven architectures (Kafka, Service Bus) to ensure reliable, asynchronous processing of high-volume financial transactions + Contribute to a microservices ecosystem built on .NET / C#, with REST APIs, gRPC and cloud infrastructure on Azure + Collaborate closely with product managers, QA engineers and other squads (Risk, Platform, Player Account) to deliver seamlessly integrated experiences + Take part in code reviews and actively contribute to raising engineering quality across the squad + Help investigate and resolve production incidents, understanding root causes, not just symptoms + Contribute to technical discussions and push back constructively when you see a better path ## Related Videos - [Leveraging Real time data in FSIs](https://www.wearedevelopers.com/videos/806-leveraging-real-time-data-in-fsis) - [Migrating half a million users to a new payment service provider](https://www.wearedevelopers.com/videos/730-migrating-half-a-million-users-to-a-new-payment-service-provider) - [Exploring the Power of gRPC-Gateway for Writing RESTful Services](https://www.wearedevelopers.com/videos/2072-exploring-the-power-of-grpc-gateway-for-writing-restful-services) - [Reducing LLM Calls with Vector Search Patterns - Raphael De Lio (Redis)](https://www.wearedevelopers.com/videos/1714-reducing-llm-calls-with-vector-search-patterns-raphael-de-lio-redis) - [Inside Bitpanda's Tech Stack: Scaling a European Fintech Leader - Markus Dorner](https://www.wearedevelopers.com/videos/1979-inside-bitpanda-s-tech-stack-scaling-a-european-fintech-leader-markus-dorner) - [Boosting OpenSearch Performance: gRPC Search in Action](https://www.wearedevelopers.com/videos/1964-boosting-opensearch-performance-grpc-search-in-action) ## Related Articles - [Fully Remote Software Engineer Jobs](https://www.wearedevelopers.com/magazine/447-fully-remote-software-engineer-jobs) - [Highest Paying Tech Companies in Europe](https://www.wearedevelopers.com/magazine/162-highest-paying-tech-companies-in-europe) - [Software Engineer Salary London](https://www.wearedevelopers.com/magazine/252-software-engineer-salary-london) - [Top-Paying Tech Jobs (with Salaries)](https://www.wearedevelopers.com/magazine/372-top-paying-tech-jobs-with-salaries) - [Highest Paying Tech Companies for Developers](https://www.wearedevelopers.com/magazine/220-highest-paying-tech-companies-for-developers) - [The 12 Best Jobs for Software Engineers](https://www.wearedevelopers.com/magazine/401-the-12-best-jobs-for-software-engineers)