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Contact Information
| Name | Arttu Tuominen |
| Professional Title | Software Developer |
| arttutuominen@protonmail.com | |
| Phone | +358 44 0278859 |
Professional Summary
Backend-focused software developer with 4+ years of experience working with .NET and C#, building and maintaining APIs for real production systems.
Experience
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2024 - present Software Developer
Saima Soft Oy
Maintain and develop legacy backend systems (15+ years old) built on .NET, supporting internal business-critical applications for StaffPoint Oy.
- Implemented distributed tracing and logging using OpenTelemetry and Azure Application Insights, becoming the primary developer responsible for observability and debugging workflows.
- Monitor production systems, analyze logs, and resolve issues impacting real users, improving system reliability and incident response.
- Focus on API security and access control, performing extensive endpoint validation and testing.
- Support team productivity by introducing and guiding effective use of GitHub Copilot for development workflows.
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2023 - 2024 Military Service
Puolustusvoimat - Försvarsmakten - Finnish Defence Forces
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2022 - 2023 Software Developer
Saima Soft Oy
Developing and maintaining backend systems for production use, with a primary focus on C# and .NET APIs, reliability, and long-term maintainability.
- Developed and maintained API features and fixes using C# and .NET.
- Collaborated with cross-functional teams to troubleshoot and resolve software issues efficiently.
- Worked in an agile team on backend architecture and feature development.
- Contributed to frontend functionality when needed using TypeScript and React.
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2022 - 2022 Junior Developer
Saima Soft Oy
Worked alongside studies while maintaining and developing backend services for internal applications and participating in modernization work.
- Maintained and developed backend services for internal applications while studying.
- Contributed to feature development and bug fixing in a .NET Core system.
- Participated in modernization efforts, including upgrades from .NET Core 3.1 to .NET 8.
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2021 - 2022 Intern
Saima Soft Oy
Started by learning a complex legacy backend system, focusing on bug fixing, API testing, and access control validation.
- Worked on a legacy .NET Framework backend system with a focus on bug fixing.
- Performed API testing and access control validation using Postman.
- Created internal documentation to improve team understanding of the system.
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2021 - 2021 Rovaniemi, Finland
Intern
Kärkkäinen Oy
A school work placement, the topic of which was selling and customer meetings. I mainly shelved products and suggested and sold products that customers asked for.
- Gained experience in customer service and retail operations.
- Learned to identify customer needs and provide appropriate product recommendations.
- Improved communication skills through direct interaction with customers.
Education
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Nov 2024 - Apr 2026 Rovaniemi, Finland
Open University of Rovaniemi
Information Technology
- Cyber Security Psychology (5 ECTS)
- Software Testing (5 ECTS)
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10.08.2020 - 31.3.2023 Rovaniemi, Finland
Skills
.NET Backend Development (Advanced): C#, .NET Framework, REST API Design, API Maintenance, Backend Architecture
API Testing & QA (Advanced): Postman, Access Control Testing, Test Automation, Debugging, Issue Resolution
Full-Stack Development (Intermediate): TypeScript, React, Frontend Feature Development, Agile Collaboration
IoT & Embedded Systems (Intermediate): ESP32, C, ESP-IDF, BLE Setup, HTTP Communication, NVS Storage, OTA Updates
Collaboration & Agile Practices (Advanced): Cross-functional Teamwork, Agile Development, Scrum, Code Reviews
Languages
Finnish : Native speaker
English : Intermediate
Interests
IoT & Embedded Systems: ESP32 Projects, IoT Device Prototyping, BLE Communication, Home Automation, Smart Devices
Outdoor Activities: Trail Running, Hiking, Snowboarding
Fitness & Sports: Gym Training, Boxing, Strength Training
Technology & Learning: Software Development, Backend Architecture, Hardware-Software Integration, Learning New Frameworks
Projects
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2024 - present ESP32 IoT LED Controller
An IoT firmware project for the ESP32 microcontroller, enabling LED control through wireless connectivity. The system supports BLE-based WiFi credential setup, HTTP requests for device control, non-volatile storage for configuration, and over-the-air (OTA) firmware updates.
- BLE setup for WiFi credentials
- HTTP API for LED control
- Non-volatile storage (NVS) for device configuration
- Over-the-air (OTA) firmware updates
- Built with ESP-IDF in C