Senior Software Engineer (Python, Golang, Kubernetes)

Holisticon Connect is a division within NEXER GROUP - a custom software development company. We started in Poland in 2017 and are now a team of over 140 people. We have the opportunity to work with world-renowned brands from Scandinavia, the UK, and Western Europe. Our goal is to grow stronger, in competence rather than in numbers. If you like what we do, check out our offer, maybe we will have the pleasure of meeting you! 😊

We are looking for a Senior Software Engineer (Python, Golang, Kubernetes). You will take end-to-end ownership of core Python services that power computational pathology and image analysis within Oncology R&D AI, keeping them robust, scalable, and well maintained. You’ll help shape our microservice architecture by defining clear service boundaries and interfaces, guiding key design decisions, and driving improvements in reliability and performance across the platform.

We offer a choice of employment form: B2B or Employment Contract

• UoP: 17 000 – 20 000 PLN gross/month
• B2B: 140 – 170 PLN net/hour + VAT

You might be the perfect match if you are/have:

• M.Sc. in Computer Science/Engineering (or equivalent) or comparable industry experience.
• Expert-level production experience with Python and solid hands-on experience with Golang for building and operating services.
• Deep understanding of microservices, distributed systems, and API design (REST/gRPC), with a focus on clean contracts and handling failure modes.
• Practical experience with SQL and NoSQL databases, including schema design, performance tuning, and familiarity with object storage solutions (e.g., S3).
• Proven experience deploying and operating services on Kubernetes, along with strong Unix/Linux fundamentals.
• Practical knowledge of key AWS services (EKS, EC2, S3, RDS, IAM, CloudWatch) and the ability to design cost‑efficient architectures.
• Strong engineering practices, including CI/CD, automated testing, code reviews, documentation, and a security-first mindset.
• Ability to lead technical initiatives, clearly communicate trade-offs, and collaborate effectively across multidisciplinary teams.

Moreover, we appreciate skills in these areas:

• Experience with ML/AI tooling such as Kubeflow, MLflow, Feast, Argo, Airflow, Ray, and model versioning/monitoring solutions.
• Experience with large-scale image processing or digital pathology data (e.g., whole‑slide images) using libraries such as OpenSlide, scikit-image, or OpenCV.
• Experience with performance engineering, including concurrency, memory profiling, high‑throughput data pipelines, and GPU/accelerator integration.
• Experience working in regulated environments (e.g., GxP), including data governance, privacy requirements, and developing software under regulated processes.
• Experience with JavaScript/TypeScript for building internal tools and dashboards.
• Experience with event‑driven architectures and streaming platforms (e.g., Kafka).

By joining us, you gain the following:

• Opportunity to work on exciting, international projects in cutting-edge industries like Automotive, Biotech, IoT;
• Possibility to develop in cloud technologies;
• Becoming part of a team that believes that the next step to a promising future is to put your heart into it and make it happen;
• Respect for your private life so you don't have to work overtime or on weekends;
• Team Events budget to socialize outside of work;
• Company Events to celebrate smaller and bigger successes (Summer Party, Programmer's Day, and trips abroad – so far we've been in South Africa, Are, and Barcelona).

Perks and benefits:

• Fully remote work or in our office in Wrocław;
• Benefits such as Luxmed, Multisport, and life insurance in Nationale Nederlanden;
• Attractive referral system (9,5k for senior, 6k for mid, 2,5k for junior);
• Personal Training Budget with additional paid hours;
• Passion Day - an extra day off for your hobby to spend as you please;
• Flexible working hours with no micro-management approach. Our core hours are 9-15, the rest of the working time is up to you;
• We provide high-quality work equipment + 2 additional monitors and accessories.

If you apply for this position and match our expectations, then:

• You will be invited for an HR screening to get to know your experience, expectations, and motivation;
• You will complete a coding test (HackerRank) to demonstrate your technical skills;
• You will be invited for a technical interview (~60 minutes) to discuss your approach, problem-solving, and frontend expertise in more depth;
• You will meet the team members to learn more about the project and see how we collaborate on a daily basis.

Submit your application online in one easy step! Apply now!