Senior Lead .NET Software Developer

Afry Ab; Kraków; Hybrid; PLN 180,000 - 240,000; Full time

Benefits offered by this job

Private medical insurance

Life assurance

Sport card (Multisport)

Social fund

Job summary

AFRY Energy Intelligence and Digital Solutions team seeks a Senior Lead Developer to design, build, and evolve the data intelligence platform. You will own technical solutions, drive best practices, and mentor the development team while delivering scalable .NET and web applications.

Based in Kraków with hybrid options across AFRY's European offices, the role combines hands-on coding with technical leadership, influencing architecture, DevOps, and delivery quality to meet strategic business goals.

Qualifications

• Senior Software Developer with enterprise/SaaS experience.
• Strong .NET/C#/ASP.NET Core and modern software engineering practices.
• Solid frontend experience with React.
• Proven mentoring and leadership of development teams.
• Knowledge of cloud-based architectures and relational databases.

Responsibilities

• Lead design, development, and implementation of scalable software solutions using .NET, C#, and modern web tech.
• Have frontend experience using ReactJS.
• Support software architecture decisions and ensure secure, maintainable solutions.
• Establish engineering best practices, coding standards, and processes.
• Promote continuous improvement of development methodologies and tools.
• Contribute hands-on across the full SDLC from design to deployment and support.
• Identify opportunities to leverage new technologies for value delivery.
• Support team development with guidance and coaching.

Skills

.NET

C#

ASP.NET Core

React

Architecture

Mentoring

Cloud

Education

Bachelor's or Master's in CS/Engineering

Tools

Azure

Microsoft SQL Server

DevOps practices

Job description

We are looking for an experienced and highly skilled Senior .NET Software Developer to join our Energy Intelligence and Digital Solutions team. This is a key role for a senior professional who combines hands‑on development expertise with technical leadership and mentoring capabilities.

As a Senior Lead Developer, you will play a critical role in designing, building, and evolving AFRY's data intelligence platform and digital products. You will be expected to take ownership of technical solutions, drive development best practices, and support the growth and effectiveness of the development team.

Key Responsibilities

• Lead the design, development, and implementation of scalable software solutions using .NET, C#, and modern web technologies.
• Have front‑end experience using ReactJS.
• Support in the software architecture decisions and ensure solutions are maintainable, secure, and aligned with long‑term business objectives.
• Establish and promote engineering best practices, coding standards, and development processes.
• Support the continuous improvement of development methodologies, tools, and ways of working.
• Contribute hands‑on throughout the full software development lifecycle, from design and implementation to deployment and support.
• Identify opportunities to leverage new technologies and innovative approaches that improve delivery, quality, and business value.
• Support the development of the team, providing guidance, coaching, and support to other developers.

Qualifications

• Experience as a Senior Software Developer, preferably within enterprise, SaaS, platform, or data‑driven environments.
• Strong expertise in .NET, C#, ASP.NET Core, and modern software engineering practices.
• Solid experience with frontend technologies, preferably React.
• Proven track record of leading technical initiatives and supporting other developers through mentoring and coaching.
• Strong understanding of software architecture, cloud‑based applications, and scalable system design.
• Experience working with relational databases and data management solutions, preferably Microsoft SQL Server.
• Excellent problem‑solving capabilities and the ability to make sound technical decisions in complex environments.
• Degree in Computer Science, Engineering, or a related STEM discipline, or equivalent practical experience.

Preferred Experience

• Experience with Azure cloud services and modern DevOps practices.
• Knowledge of data platforms, analytics solutions, and data engineering concepts.

What Success Looks Like

The successful candidate will bring both technical excellence and leadership. We are looking for someone who can strengthen the team's delivery capability by actively developing solutions while also guiding more junior team members, raising engineering standards, and helping shape the future direction of our platform.

This role is particularly suited to a senior developer who enjoys being hands‑on, leading by example, and enabling a team to deliver high‑quality products at scale. We are seeking an individual with proven experience operating at a senior level and who can immediately contribute through strong technical expertise, execution capability, and leadership.

Location

This role is ideally based in our Oxford office, where the wider Software Development team is located. However, we are also open to candidates based in one of AFRY's European offices, provided they can work effectively with the team and stakeholders across our international organisation.

Company Description

AFRY provides engineering, project management, and advisory services that enable the energy and industrial transition and strengthen resilience in society.

With 18,000 experts worldwide, we combine a global reach with local insights and deep sector knowledge to make a lasting impact for generations to come.

Additional Information

To individuals who join our team, we offer:

• Employment based on an employment contract
• 50% tax‑deductible costs for income from creative activities managed by the employer
• Private medical insurance, life assurance, sport card (Multisport) and a social found
• Exciting and challenging projects
• Friendly working atmosphere in a multidisciplinary and international team
• Helping to shape a sustainable future

Available office locations for this position are either in Poznań, Kraków or Łódź. We are flexible on the office location for this position, please indicate your preference in your covering letter. We value a healthy work life balance and are committed to your wellbeing. We will operate a hybrid working environment.

At AFRY, we engineer change in everything we do. Change happens when brave ideas come together. When we collaborate, innovate technology, and embrace challenging points of view. That’s how we’re making future. We are actively looking for qualified candidates to join our inclusive and diverse teams across the globe. Join us in accelerating the transition towards a sustainable future.

At AFRY, we engineer change in everything we do. Change happens when brave ideas come together. When we collaborate, innovate technology, and embrace challenging points of view. That’s how we’re making future. We are actively looking for qualified candidates to join our inclusive and diverse teams across the globe. Join us in accelerating the transition towards a sustainable future.