Senior Software Engineer II

Accelleron; Województwo pomorskie; On-site; PLN 180,000 - 280,000; Full time

Benefits offered by this job

Attractive compensation & benefits

Employee Assistance Program

Global parental leave program

Flexible working models

Job summary

A global technology leader is seeking a Senior Full Stack Developer to join their Digital Customer Solutions division in Poland. You will work in a cross-functional agile team to design and maintain scalable applications with technologies such as C#, .NET Core, React, and Azure. The ideal candidate has strong backend and frontend skills, a passion for innovation, and a desire to mentor others. Attractive compensation and flexible working models are offered to strengthen retention and satisfaction.

Qualifications

• Proven experience developing robust backend systems.
• Strong skills in creating responsive frontend applications.
• Ability to mentor others in a software development team.
• Azure cloud services experience.
• SQL/NoSQL and time-series databases (InfluxDB) expertise.
• Experience with microservices and distributed systems.
• Excellent English communication (written and spoken).
• Experience mentoring and developing team members.

Responsibilities

• Design scalable applications using modern technologies.
• Develop features from end-to-end, focusing on quality.
• Conduct code reviews and ensure standards are met.
• Conduct code reviews, ensure code quality, and contribute to continuous improvement.
• Ensure product security, performance, and maintainability standards.
• Write unit tests and conduct load testing for reliability.
• Participate in architectural design and technical decision-making for complex systems.
• Mentor and coach mid-level and junior engineers, fostering growth.

Skills

Backend development with C# and .NET Core

Frontend development with React

RESTful API design

Azure cloud services

SQL skills

Mentoring and coaching

Communication in English

SQL

NoSQL

CI/CD

Git

Azure DevOps

Microservices

Unit Testing

Tools

Visual Studio

Git

Azure DevOps

Material UI

SASS

InfluxDB

Job description

Accelleron is accelerating sustainability in the marine and energy industries as a global technology leader in turbocharging, fuel injection, and digital solutions for heavy‑duty applications. Building on a heritage of over 100 years as a trusted industry partner, the company serves customers in more than 100 locations in over 50 countries. Accelleron’s 3,000 employees are continuously innovating to deliver best‑in‑class products, services, and solutions that are mission‑critical for the energy transition. You will join a team of experts in an exciting international environment, committed to excellence and innovation. Together, we support our customers in driving the transition toward sustainable industries with cutting‑edge technology, deep expertise, and smart solutions. At Accelleron, we foster diversity and inclusion, welcoming and celebrating individual differences as a source of strength.

At Accelleron, we drive the digital transformation of energy‑intensive industries by developing solutions that enhance energy efficiency and sustainability. As part of our Digital Customer Solutions division, you will contribute to the development of intelligent and scalable products that enable our customers to achieve their sustainability goals.

As a Senior Full Stack Developer, you will work in a cross‑functional agile team to develop and maintain our digital platform. You will contribute across the stack, from designing robust backend services to delivering intuitive, responsive frontends. Your technical expertise, curiosity, and drive for quality will help shape the future of sustainable digital solutions.

Your Responsibilities

• Design, implement, and maintain scalable services and applications with our technological stack (C#, .NET Core, React, TypeScript, Redux, SQL, Azure cloud)
• Develop features end‑to‑end, including data modeling, API development, and UI
• Translate designs and wireframes into high‑quality, reusable code
• Conduct code reviews, ensure code quality, and contribute to continuous improvement
• Ensure product security, performance, and maintainability standards are met
• Write unit tests and conduct load testing to ensure product reliability
• Participate in architectural design and technical decision‑making for complex systems and cross‑functional initiatives
• Mentor and coach mid‑level and junior engineers, fostering growth and technical excellence
• Drive adoption of scalable engineering practices and enforce coding standards across teams
• Collaborate with product and business stakeholders to align technical solutions with strategic goals
• Promote ongoing enhancement of development practices, tools, and team culture.

Your background

• Demonstrated ability to take ownership within a software development team
• Proven experience developing backend systems using C# and .NET Core
• Strong frontend development skills with React, TypeScript, Redux
• Solid understanding of RESTful API design and integration
• Expertise in algorithms, data structures, and software design principles
• Experience with Azure cloud services: App Services, Entra ID, Key Vault, Blob Storage, Service Bus, App Insights, CI/CD pipelines
• Familiarity with Visual Studio, Git, and Azure DevOps
• Experience with SQL, NoSQL, and time‑series databases (e.g., InfluxDB)
• Excellent communication skills in English (written and spoken)
• Strong track record of mentoring and developing team members
• Experience with Ionic, Angular, or hybrid mobile development is a plus
• Familiarity with Material UI, SASS, Webpack, Babel, NPM is a plus
• Exposure to modern ECMAScript standards and tools is a plus
• Experience working with microservices architecture and distributed systems is a plus

What We Value

• Proactive mindset with a passion for innovation and problem‑solving
• Commitment to delivering high‑quality work on time
• Ability to adapt to evolving technologies and work both independently and in a team
• Strong analytical skills and attention to detail
• Desire to mentor and share knowledge within the team
• Organized approach with effective time and task management skills

How We Work

• We operate in cross‑functional, agile end‑to‑end feature teams
• Our teams follow the SAFe (Scaled Agile Framework) methodology to align on delivery and strategy
• We use modern tools, technologies, and practices, and continuously challenge and improve our ways of working
• We value open communication and encourage team members to actively contribute ideas and feedback
• We run a quarterly hackathon, giving everyone the opportunity to learn, explore and share their own ideas

Your Benefits

• Attractive compensation & benefits
• Employee Assistance Program
• Global parental leave program
• Flexible working models

We look forward to receiving your application. If you want to discover more about Accelleron, take another look at our website accelleron.com.

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Job Family Group

Digital