Senior Fullstack Developer | Krakow, Poland

Hitachi Energy Ltd.; Kraków; On-site; PLN 360,000 - 520,000; Full time

Benefits offered by this job

Private medical care

Life insurance

Fitness & wellness programs

Benefits platform

Employee Capital Plans (PPK)

Home office equipment allowance

Spectacles allowance

Company events

Psychological support

Free parking

Job summary

Hitachi Energy Ltd. is seeking an experienced R&D Software Developer focused on .NET application development for performance-critical real-time systems in Kraków. You will build high-performance, secure software with .NET, designed for long product lifecycles and reliability.

You will work with global technology teams, contributing to real-time software for critical infrastructure and power systems while embracing modern microservices, security, and scalability practices.

Qualifications

• 8+ years in senior technical roles.
• Advanced proficiency in .NET stack: C#, REST Web Services, .NET Core.
• Strong emphasis on code quality, Clean Code, SOLID and code reviews.
• Experience with Git, build management, Docker/Podman, Kubernetes + Helm, SQL.

Responsibilities

• Design and develop .NET applications for performance-critical systems.
• Design, develop and maintain microservices architecture for back-end.
• Participate in code reviews.
• Troubleshoot and fix issues from E2E testing.
• Share knowledge and improve code quality with the team.
• Collaborate with Product Owner and QA to deliver projects.

Skills

C#

.NET

REST Web Services

.NET Core

Microservices

Kubernetes

Azure DevOps

Git

SQL

Security

Education

University degree in computer science or related field

Tools

Docker

MSBuild

Azure DevOps Pipelines

Job description

We are seeking an experienced R&D Software Developer focused on .NET application development for performance‑critical systems to join our technology organization.

In this role, you will develop, high-performance, and secure software systems built with .NET technology, with a strong focus on real-time behavior, reliability, and long product lifecycle support.

As an R&D Software Developer within the Grid Automation domain, you will help shape innovative solutions for the power systems of tomorrow.

You will work closely with global technology teams that bring niche expertise and cutting‑edge capabilities. Your work will directly support the development of real‑time software used in critical infrastructure worldwide software designed for long‑term reliability, high efficiency, and uncompromising security.

We value diverse experience and fresh perspectives. Even if you do not meet every listed requirement, we encourage you to apply. We are excited to learn more about you and the unique strengths you can bring to our team.

How you’ll make an impact:

• Achieve business goals through designing and developing code in the .NET technologies.
• Design, develop and maintain microservices architecture for back‑end.
• Participate in code review.
• Troubleshooting and bug fixing for all issues discovered during E2E testing
• Share your experience and skills with other team members.
• Proposing and elaborating with other team members on how to improve code quality, performance and stability.
• Work closely with Product Owner, QA engineers to ensure successful project delivery

Your Background:

• University degree in computer science, engineering, or a related technical field.
• 8+ years of experience in senior technical roles.
• Advanced proficiency in .NET technology stack: C#, REST Web Services and .NET Core.
• Assure high code quality through unit tests and adherence to software development best practices like Clean Code, SOLID, and code reviews.
• Hands on knowledge in following areas:
  • Git version control system
  • Build management - Azure DevOps Pipelines, MSBuild,
  • Docker / podman
  • Kubernetes + Helm
  • SQL database knowledge
• Demonstrate understanding of the concepts API Development and Consumption.
• Practical knowledge of Kafka and C++ development in plus.
• Demonstrated experience with performance profiling, optimization, and low‑latency systems.
• Understanding of software architecture principles and secure, scalable system design.
• Excellent problem‑solving skills and the ability to tackle complex technical challenges.
• Good understanding of unit and integration testing techniques and testing frameworks.
• Knowledge of non‑functional requirements (performance, scalability, security).
• Practical experience developing systems for power grid management and monitoring having familiarity with WAMS/WAMPAC, PMU data, and protection and control applications.
• Understanding of power grid operations and applicable standards.
• Experience with industrial automation systems (SCADA, IED, RTU) in plus.
• Experience with industrial protocols and standards (IEC 61850, IEC-60870-5-104, DNP3, OPC UA, IEEE C37.118) in plus.
• Practical experience working directly with power grid industry clients and exposure to system integration, simulators, or lab environments.
• Proven ability to translate customer requirements into clear technical designs.
• Solid understanding of numerical methods, signal processing, and control fundamentals and ability to work with high‑frequency, time‑aligned time‑series data
• Good understanding of power system dynamics and the stability challenges introduced by high penetration of renewables
• Effective team player with strong communication skills and willingness to learn.
• Excellent command of English (written and spoken).

More about us

We pride ourselves on offering a holistic range of competitive benefits to support your financial, physical and mental wellbeing and personal development. We want you to truly thrive with us, in work and out.

We can provide more information during the recruitment process.

Our benefits offering for this role generally includes:

• Private medical care and life insurance
• Access to fitness and wellness programs
• Access to benefits platform with discounts and perks
• Employee Capital Plans (PPK)
• Equipment for working from home or allowances for setting up a workplace at home
• Spectacles and contact lenses allowance
• Company events and team‑building activities
• Psychological support program
• Free parking available

You will receive more specific information during the recruitment process.

We are a global leader in electrification, powering the electricity era to meet the energy demands of today, and the next 25 years. As the energy arm of Hitachi Group, over three billion people depend on our pioneering, mission‑critical technologies to power their daily lives.

With over a century of innovation, we are addressing the most urgent energy challenge of our time: driving the evolution of the world’s energy system to ensure abundant, secure, affordable, and sustainable power for today’s generation and the next.

With an unparalleled installed base in over 140 countries, we are the grid ecosystem partner across the utility, industry, data center, and transportation sectors. Headquartered in Switzerland, we employ over 56,000 people in 60 countries and generate revenues of around $20 billion USD.