Senior Software Developer

OneOcean Group; Polska; Hybrid; PLN 200,000 - 280,000; Full time

Benefits offered by this job

Premier Health Coverage

Vision Care Perks

Group Insurance

Pension scheme

Multisport Gym Access

Social Benefit Fund

Employee Assistance Program

Job summary

OneOcean Group is seeking a Senior Software Developer in Poland to design, build, and maintain high‑performance maritime software. You will work closely with product managers, designers and engineers to deliver robust features and improve the platform's quality and reliability.

You will apply your extensive experience in .NET and Python, guided by best practices, to evolve capabilities, maintain the codebase, and support mission‑critical operations across global users.

Qualifications

• 7+ years in commercial development.
• Proficiency in .NET framework/core and Python.
• Experience with microservices and distributed architecture.
• Strong REST/GraphQL, asynchronous programming, and logging.
• Experience with SQL/NoSQL (MsSQL, MongoDB), Docker, and cloud (Azure).

Responsibilities

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

Skills

NET/.NET Core

Python

OOP

REST/GraphQL

Asynchronous programming

SQL/NoSQL

Docker

Azure

Microservices

Tools

MS SQL

MongoDB

Docker

Azure

Job description

Application Deadline: 1 December 2026

Department: Technology

Employment Type: Full Time

Location: Poland

Reporting To: Tomasz Fojtuch

Description

Discover OneOcean:

OneOcean is a unified brand born from the integration of OneOcean and Ocean Technologies Group.

Owned by Lloyd’s Register, an organisation with more than 260 years of trust, integrity and leadership at sea, OneOcean 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 OneOcean 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.

Why Join OneOcean Crew?

• 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 OneOcean 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.

Navigating the position: Senior Software Developer

OneOcean 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

Key Responsibilities:

Develop and Maintain Software Applications:

• 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.

Collaboration and Support:

• 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.

Continuous Improvement:

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.

Testing and Documentation:

• 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.

Skills, Knowledge, and Experience Required:

• 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/GraphQL, and application logging.Strong experience with SQL/NoSql (MsSQL, MongoDB), Docker, and cloud platforms (Azure).
• Excellent communication, teamwork, detail-oriented, and analytical skills.

Desirable Qualifications:

• Experience with front-end technologies (React, HTML, CSS, JavaScript, jQuery).
• Experience with CI/CD pipelines, Jenkins, and modern DevOps practices.
• Experience with AWS/Azure cloud environments.
• Familiarity with application performance monitoring tools.

Benefits:

• Premier Health Coverage: Dive into comprehensive health care with Polmed, covering everything from diagnostics to specialist consultations. Minimal costs for maximum health!
• Vision Care Perks: See the world more clearly with glasses reimbursements every two years. Work and wellness in perfect harmony.
• Group Insurance: Secure your peace with easy opt-in Warta Group Insurance. Family inclusion available, ensuring everyone you love is protected.
• Pioneering Pension: Join the PPK Pension scheme effortlessly, with flexibility to adjust your involvement. OTG invests in your future, so you can enjoy the present.
• Multisport Magic: Stay fit and energized with access to top-tier sports facilities. Your health, your choice, our support.
• Social Benefits Galore: Embrace our Social Benefit Fund for a boost to your lifestyle. It's all about enhancing your OTG experience.
• Wellness & Support: Unlock 24/7 access to professional counseling with our Employee Assistance Program. We're here for you in every way.