Senior Software Developer (C++ / C#)

We are looking for a Senior Software Developer for our client to modernize and modularize a large, existing C++ application while designing new components in C#. This role combines hands-on development, legacy system refactoring, and the creation of scalable, future-oriented solutions. You will join a collaborative and close-knit development team in a hybrid role based in Espoo, with flexibility for remote work.

Responsibilities:
· Refactor and modularize a large C++ codebase to enhance maintainability, scalability, and overall architecture.
· Design and implement new C# components to support the evolution of the platform.
· Apply cloud architecture principles to improve scalability, performance, and security.
· Contribute to CI/CD pipelines, automation, and deployment processes.

Must have requirements:
· Extensive experience in C# development.
· Strong proficiency in C++ for legacy system work.
· Solid understanding of cloud architecture, scalability, and security principles.
· Proven experience refactoring and modularizing large applications.
· Excellent problemsolving and decisionmaking abilities.
· Ability to guide, support, and mentor other developers.
· Degree in Computer Science, Engineering, or a related field.

Nice to have requirements:
· Experience with container technologies (Docker/Kubernetes).
· Background in industrial software, simulation, or robotics.
· Familiarity with manufacturing or automation systems.

Ideal Candidate Profile:
You are a proactive, hands-on Senior Developer (10+ years preferred) who enjoys working in a collaborative, international team. Youre confident working with both complex legacy code and modern architectures, and you bring strong technical judgment and a systemsthinking approach. You naturally mentor others and contribute to longterm technical direction, valuing an inclusive, lowhierarchy culture focused on continuous learning.

Work Environment:
You will join a supportive, low hierarchy organization with a strong international presence. The team values openness, teamwork, and practical contribution. The environment encourages learning, knowledge sharing, and taking initiative.

Answer these questions separately in a few sentences and attach them to your application!
– Do you have professional experience developing in C#?*
– Do you have hands-on experience working with C++ in a production or legacy-code environment?*
– Have you previously refactored or modularized a large-scale software application?*
– Do you have practical experience applying cloud architecture principles (e.g., scalability, security, distributed systems)?*

Please apply with your CV in English, clearly showing how you match the requirements and answer to the questions above. The client is continously reviewing candidates and we ask you to submit your application as soon as possible.

Location: Espoo, Finland (hybrid, 2-3 days on-site)
Start date: As soon as possible
Contract: Full time, employment contract will be signed directly with the client
Language: English

We offer you: We offer a versatile assignment where every day is different and interesting. We also offer a very competitive salary and good employee benefits. The salary range for this position is 5,5006,500 euros per month.

Are you interested in becoming a part of our dynamic team? The position will be filled as soon as a suitable person is found, so please be quick and submit your application!

Please include your salary expectation in your application. For more information, contact Kimmo Kärsämä, tel. 050 412 7500, kimmo.karsama@lokki.fi

Explore Lokki, through our blog and website: https://www.lokki.fi/ .

Lokki Henkilöstöpalvelut Oy (Finnish for Seagull Recruitment Services) has been active in providing recruitment services since 2005 and we belong to The Private Employment Agencies Association HPL. Our vision is to provide the best customer experience with our reliable, humane and effortless service around Finland. Our most important asset is a person who, as we know, thrives in a reliable and supportive atmosphere. At Loki you will be supported by your own human resources consultant throughout your employment relationship. At Lokki, we believe in a partnership achieved as a result of flexible service. Explore us and our vacancies: https://www.lokki.fi/.

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Osaamisalue: IT & tietoliikenne