Senior .NET Engineer

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

Benefits offered by this job

Medical insurance

Udemy license

23 vacation days

Short Fridays

Internal mobility program

Job summary

Ciklum is seeking a Senior .NET Engineer to join our team in Spain. You will be part of a cross-functional development group, working on back-end services in a microservice architecture for a fast-growing global payments client.

You will collaborate with PMs, architects, and QA in an Agile, distributed team, delivering features with high quality, performance, and security. The role offers hybrid work from Málaga and opportunities for professional growth.

Qualifications

• Experience in software development for more than 5 years.
• Excellent knowledge of clean code practices, OOP and OOD.
• Excellent knowledge in programming and REST API development.
• Database theory including RDBMS and NoSQL.
• Strong testing practices (unit/integration/functional).
• Algorithms and data structures.
• Knowledge of Architectural and Design Patterns.
• Security patterns, OWASP awareness.
• Experience with REST, RPC, OAuth/JWT authentication flows.
• Excellent knowledge of C# and .NET (Core/Framework).
• Proven experience with Redis, messaging systems (RabbitMQ, Kafka, SQS).
• Version control (Git) and CI/CD tools.

Responsibilities

• Back-end development in a microservice architecture.
• Participate in design decisions for architecture and code reviews.
• Develop and review feature design documents and specifications.
• Design and implement various tests (unit, integration, functional).
• Work in an international distributed Agile team.
• Communicate with PMs, engineers, architects, QA and stakeholders.
• Deliver product roadmap and planning.
• Maintain high coding standards and testable, performant code across the SDLC.

Skills

Fluent English

OOP/OOD

Clean code

C# & .NET

REST API

Databases

Testing frameworks

Algorithms

Data structures

Agile

Security patterns

Tools

REST API

ASP.NET Core

Entity Framework/Dapper

SQL Server

PostgreSQL

Redis

RabbitMQ

Kafka

Git

CI/CD (Gitlab/Jenkins/Azure DevOps)

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.