Senior Software Developer

Final date to receive applications: 30 July 2026

Department: Technology

Employment Type: Full Time

Location: Poland

Reporting To: Tomasz Fojtuch

Discover One Ocean:
One Ocean is a unified brand born from the integration of One Ocean and Ocean Technologies Group. Owned by Lloyd’s Register, an organisation with more than 260 years of trust, integrity and leadership at sea, One Ocean combines the agility and ambition of a fast-moving innovator with the strength and stability of one of the world’s most trusted maritime institutions.

At the heart of One Ocean is a portfolio unlike any other in maritime. A comprehensive, integrated portfolio built on years of expertise, trusted by thousands of maritime professionals around the world.

Our Mission:
Our mission is clear. In the race to zero emissions, our research, advisory and technical expertise and industry-firsts are supporting a safe, sustainable maritime energy transition. Today we are a leading provider of classification and compliance services to the marine and offshore industries, helping our clients design, construct and operate their assets to accepted levels of safety and environmental compliance.

• Legacy & Innovation:
  We were created more than 260 years ago as the world’s first marine classification society to improve and set standards for the safety of ships.
• Global Impact:
  Our digital solutions are relied upon by more than 30,000 vessels, following the acquisition of One Ocean in 2022 and Ocean Technologies Group in 2024.
• Product Offering:
  Covering five proven product areas - learning, fleet operations, compliance, voyage planning and performance management - supporting its customers from ship to shore, from training and people operations, to voyage compliance and optimisation.

One Ocean is seeking a Senior Software Developer to play a key role in shaping the next generation of maritime software. You’ll work on robust, high‑performance applications that operate in mission‑critical environments, where reliability and precision truly matter. Collaborating closely with product managers, designers, and engineering peers, you’ll design and deliver new features, evolve existing capabilities, and help raise the overall quality of the platform.

Your work will have real‑world impact, supporting safer, more efficient maritime operations for users around the globe.

• Design, code, test, debug, and document software applications using .NET framework, Python, cloud and related technologies.
• Ensure the performance, quality, and responsiveness of applications.
• Collaborate with the team to define, design, and ship new features.

• Work with project leaders, product owners, and developers to understand business requirements and translate them into technical solutions.
• Provide ongoing maintenance, support, and enhancements in existing systems.
• Offer support to end-users of the application, by troubleshooting and problem solving.

• Stay up-to-date with new technology trends and best practices in .NET framework and Python development.
• Continuously improve the codebase, fix bugs, and optimize performance.
• Participate in code reviews to ensure code quality and shared knowledge.

• Create and maintain comprehensive documentation for software solutions.
• Develop and implement unit and functional tests to ensure code quality.
• Assist in defining test scenarios and in testing the developed functionality.

• 7+ years in commercial development.
• Expertise in .NET framework/core, Python, and object‑oriented programming
• Proficiency in Test Driven Development, unit, integration, and acceptance testing
• Experience with Microservices, distributed architecture, event buses, and message queues
• Strong understanding of client‑server architecture, asynchronous programming, ORMs, REST/Graph
  
  QL, and application logging. Strong experience with SQL/No
  
  Sql (MsSQL, Mongo
  
  DB), Docker, and cloud platforms (Azure).
• Excellent communication, teamwork, detail‑oriented, and analytical skills.

• Experience with front‑end…