Senior .NET Engineer

Ciklum; Spain; Hybrid; EUR 60,000 - 90,000; Full time

Benefits offered by this job

Medical insurance and sick leave

Udemy license and training

Language courses and certifications

Flexible schedule

23 vacation days & short Fridays

Internal Mobility Program

Global project experience

Welcoming team culture

Job summary

Ciklum is seeking a Senior .NET Engineer to join our Spain team in Málaga. You will be part of a cross-functional development team building tomorrow's experiences in a fast-growing, well-funded payments environment.

You will contribute to backend development, architecture decisions, and testing within an agile, distributed setup. The role requires 5+ years of software development, strong C#/.NET expertise, and experience with REST APIs, microservices, and databases.

Qualifications

• 5+ years of software development experience.
• Strong knowledge of Clean code, OOP and OOD.
• Proficiency in programming concepts and paradigms.
• Database theory: RDBMS, NoSQL.
• Code testing practices and methodologies.
• Algorithms and data structures.
• Architectural, Enterprise and Design Patterns.
• Security patterns, OWASP protection.
• Understanding of network interactions: REST, RPC, OAuth/JWT.

Responsibilities

• Back-end development to meet customer needs in a microservice architecture.
• Participate in design decisions for architecture and code reviews.
• Develop and review feature design documents and specifications.
• Design and implement tests (unit/integration/functional).
• Work in an international distributed Agile team.
• Communicate with PMs, engineers, architects, QA and stakeholders.
• Deliver the product roadmap and plannings.
• Write high-quality, testable, maintainable code across the SDLC.

Skills

C# and .NET

REST API development

Microservices

SQL & NoSQL databases

Unit/Integration testing

Azure / Cloud services

Git / CI tools

English proficiency

Tools

ASP.NET Core

Entity Framework

Dapper

SQL Server

RabbitMQ / Kafka

Redis

Web servers

Job description

Ciklum is looking for a Senior .NET Engineer to join our team in Spain.

We are a custom product engineering company that supports both multinational organizations and scaling startups to solve their most complex business challenges. With a global team of over 4,000 highly skilled developers, consultants, analysts and product owners, we engineer technology that redefines industries and shapes the way people live.

About the role:

As a Senior .NET Engineer, you'll become a part of a cross-functional development team engineering experiences of tomorrow.
Our Client is a fast-growing, profitable, well-funded and dynamic global payments company. It is serving thousands of corporates and millions of end-users (payment receivers), in 190+ countries.
Responsibilities:

• Back-end development to meet customer’s business needs and implement components according to modern software development environment (microservice architecture)


• Taking part in the decision-making process in design application architecture, solution development, architecture and code review


• Develop and review feature design documents and provide inputs/update to specifications for the solution


• Design and implement a set of various types of tests (unit, integration, functional, etc)


• Working in an international distributed team in an Agile environment


• Communicate with PMs, engineers, Architects, QA and other colleagues and stakeholders


• Delivering the product roadmap and plannings


• To use high coding standards, software best practices and write highly testable, automatable and performant code over the whole SDLC

Requirements:

• Experience in software development for more than 5 years


• Excellent knowledge in: Clean code practices, OOP and OOD


• Excellent knowledge in Programming


• Database theory (RDBMS, NoSQL)


• Code testing practices


• Algorithms


• Data structures


• Architectural, Enterprise and Design Patterns


• Security patterns, Reverse engineering resistance, Common attacks types (OWASP)


• Understanding of network interactions: protocols, conventions (e.g. REST, RPC), authentication and authorization flows, standards and practices (e.g. oAuth, JWT)


• Excellent knowledge and experience in C# and .NET


• Practical commercial experience with: REST API development, .NET Framework, .NET Core, ASP.NET (Core, MVC, WebAPI), Testing frameworks (e.g. e.g. NUnit, XUnit, MSTest), ORM (e.g. Entity Framework, Dapper) (more than 2 years), RDBMS (e.g. SQL Server, MySQL/MariaDB, PostgreSQL), Key-value storages, strong experience with Redis, Messaging systems (e.g. RabbitMQ, Azure ServiceBus, Apache Kafka, Active MQ, AWS SQS, Google Pub/Sub), Web Servers, Version control systems (GIT), Continuous Integration tools (e.g. Gitlab Pipeline, Jenkins, Azure DevOps), Builders


• Experience with: Troubleshooting, profiling and debugging applications, Creation software architecture and design of complex applications, platforms, microservices solutions, Agile software processes and technologies, Code Review process, refactoring process


• Fluent or Upper-Intermediate English

What’s in it for you?

• Care: your mental and physical health is our priority. We ensure comprehensive company-paid medical insurance and 4 additional undocumented sick leave days


• Tailored education path: boost your skills and knowledge with our regular internal events (meetups, conferences, workshops), Udemy license, language courses and company-paid certifications


• Growth environment: share your experience and level up your expertise with a community of skilled professionals, locally and globally


• Flexibility: Own your schedule – you are the one to decide when to start your working day. Just don’t miss your regular team stand-up. We are there to support your work-life balance and provide 23 vacation days & short Fridays


• Opportunities: we value our specialists and always find the best options for them. Our Internal Mobility Program helps change a project if needed to help you grow, excel professionally and fulfill your potential


• Global impact: work on large-scale projects that redefine industries with international and fast-growing clients


• Welcoming environment: feel empowered with a friendly team, open-door policy, informal atmosphere within the company and regular team-building events

About us:

At Ciklum, we are always exploring innovations, empowering each other to achieve more, and engineering solutions that matter. With us, you’ll work with cutting-edge technologies, contribute to impactful projects, and be part of a One Team culture that values collaboration and progress.

Based in Málaga, our team thrives in one of Andalusia’s leading tech hubs. Enjoy a hybrid work setup, the sunny Mediterranean vibe, and endless opportunities to grow your skills on global-scale projects.

Explore, empower, engineer with Ciklum!

Interested already? We would love to get to know you! Submit your application. We can’t wait to see you at Ciklum.