New offer - be the first one to apply!

August 8, 2026

Senior Expert Engineer

Senior • Hybrid

Krakow, MA, Poland

Join the Group Business Solutions division to design and sustain IT solutions for financial market securities. Strengthen solutions and drive meaningful improvements in a collaborative, fast-evolving environment aligned with business needs.

Your day-to-day mission

  • Drive the design, architecture, and implementation of scalable solutions; own complex features and collaborate across teams to deliver robust systems.
  • Mentor engineers, supporting complex problem-solving and team growth.
  • Lead ideation workshops to shape high-impact ideas that improve product functionality and user experience.
  • Define, estimate, and validate complex multi-team requirements.
  • Anticipate dependencies, improve planning accuracy, and ensure predictable, high-quality delivery through technical judgment and collaboration.
  • Maintain production stability by leading investigations, delivering durable fixes, and proactively resolving systemic issues.
  • Promote and refine coding standards and best practices aligned with system requirements and business processes.
  • Support continuous-improvement initiatives to enhance code quality and engineering effectiveness.

What you need to have to succeed in this role

  • Strong expertise in Java and object-oriented design.
  • Proven experience building Java services and microservices.
  • Hands-on experience with Docker, Kubernetes, and containerized services.
  • Strong knowledge of Spring Boot and modern backend development.
  • Experience developing and supporting applications on Unix or Linux.
  • Hands-on experience with Kafka and event-driven architecture.
  • Experience with performance tuning and application reliability.
  • Good understanding of BDD and TDD practices.
  • Collaborative mindset and openness to peer review and feedback.
  • Self-driven, reliable, and comfortable working autonomously.
  • Strong command of spoken and written English.
  • Advanced Git workflows, testing and quality standards, independent diagnosis of complex issues through logs and monitoring, and proactive application of secure coding and dependency best practices.

What makes you stand out

  • Expertise in Oracle data modelling and database design.
  • Exposure to PL1 and IBM Mainframe environments.
  • Demonstrated leadership and interpersonal capabilities, autonomy, and an impact mindset.

Benefits

  • Work with inspiring, supportive, and engaged colleagues from more than 80 countries.
  • Highly professional international environment.
  • Learning and development environment with an emphasis on knowledge sharing and training.
  • Competitive salary and comprehensive benefits.
  • Hybrid working model: connect at the office 8 days per month and work remotely the rest of the time.
  • Inclusive workplace; qualified applicants are considered regardless of personal background or characteristics.

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The squad manages products across on-premises, private-cloud, and public-cloud environments, including bespoke C# .NET libraries delivered as NuGet packages, security token services for web-based, API-based, and message-based applications, cloud resources, middleware, runtime and hosting services, and service mesh capabilities. The team works with software developers, system administrators, and solution architects, prioritizing integration, problem solving, and optimization to deliver high availability, scalability, and reliability. It also partners with security teams to implement essential security controls and protect data. About the Role As a developer in the squad, you will focus on DevOps and act as a Subject Matter Expert for the .NET Framework. You will analyze requirements and solutions, design, implement, and integrate products, and drive application change within a regulated IT organization. Main Tasks • Learn the products and adopt a T-shaped skill set. • Maintain .NET Framework configuration and technical security baselines; manage relationships with Microsoft for incident and advisory cases. • Manage and optimize application configuration. • Collaborate with cross-functional teams to ensure seamless integration and solution delivery. • Troubleshoot and resolve deployment and integration issues promptly. • Provide technical guidance and support to clients. • Perform thorough testing, monitoring, and performance optimization for integration solutions. • Ensure compliance with data privacy regulations and internal governance policies. • Maintain pragmatic integration documentation for development teams and stakeholders. Key Qualifications • Comprehensive understanding of integration patterns, approaches, and technologies. • Proficiency in web development technologies and frameworks. • Experience integrating API security measures. • Understanding of security best practices, encryption, token-based authentication, and compliance requirements, including GDPR. • Strong analytical troubleshooting skills for complex integration challenges. • Experience in .NET application development and testing. • Familiarity with Scrum and Agile practices. • Extensive middleware experience. • Security-focused experience with advanced IT infrastructure. • Ability to work independently while maintaining a strong team mindset and quality focus. • Understanding of risk management principles, methodologies, and tools, including identifying, assessing, and mitigating operational, financial, strategic, and compliance risks. Mandatory Skills • Hands-on Azure engineering experience. • .NET C# application development and Visual Studio experience. • Azure DevOps experience. • Microsoft security knowledge in Windows Server environments, including Kerberos and Active Directory. • Understanding of CI/CD concepts. • Understanding of PKI concepts and certificates. • Experience with Azure services. • Experience with Windows Server 2016, 2019, and 2022. • Experience with PowerShell, .NET 4.8, .NET 8, ADFS, MVC, IIS, WCF, WebAPI, NuGet, and APIs. Nice to Have • OAuth, OpenID Connect, and SAML. • .NET 8 and/or Java integration on Linux. • Service Fabric. • Splunk. Benefits • Work with inspiring, supportive, and engaged colleagues in an international environment. • Learning and development environment focused on knowledge sharing and training. • Competitive salary and comprehensive benefits. • Hybrid working model, with office collaboration 8 days per month and remote-working flexibility. • Inclusive culture that celebrates diversity; qualified applicants are considered regardless of personal characteristics. • Accommodation can be requested during the application process when needed.

Technology

Superdevs

Fullstack Developer (Python & React)

Senior

Remote

140 - 160 PLN

🏢 Summary: Senior Engineer role focused on independently delivering MVP features and Proofs of Concept end-to-end on an existing large-scale SaaS and data connector platform, with strong emphasis on practical use of LLMs and AI tools in daily development. The position involves backend-oriented full-stack development, rapid prototyping, and integration with cloud and CI/CD environments in a remote setup. 🗂️ Requirements: 4+ years of experience with Python, Full-stack development experience with strong backend focus, Knowledge of TypeScript, Knowledge of React, Hands-on experience using LLMs/AI tools in development workflows, Experience integrating with cloud services, Experience working with CI/CD pipelines, Professional level of English 📃 Skills: Python, TypeScript, React, LLM, AI, SaaS, CI/CD, Cloud 🏢 Description: Does building awesome, innovative products that add up to something meaningful sound like a dream come true? Come join us and make that vision a reality! About We are looking for a Senior Engineer who will independently deliver new MVP features and Proofs of Concept end-to-end. You will build on top of an existing large-scale SaaS and data connector platform, extending it with new ideas rather than starting in a pure greenfield. A key part of this role is the practical use of LLMs and AI tools in everyday development — to accelerate prototyping, coding, research and validation. Responsibilities Independently design and build MVP features and PoCs end-to-end Validate technical feasibility and provide pragmatic architecture decisions Use LLMs and AI tools to accelerate prototyping and exploration Implement clean, maintainable code Integrate with cloud services and CI/CD pipelines for fast delivery Collaborate with product/design to shape and refine early concepts Our offer Competitive salary on B2B contract Fully remote position Real impact and independence at work Individual career path Work-life balance A non-corporate atmosphere where innovation, personal growth, and teamwork thrive 100+ smart, curious & ambitious engineers What you bring 4+ years of experience with Python Full-stack skillset with strong backend orientation Knowledge of front-end technologies like TypeScript and React Demonstrated, hands-on use of LLMs/AI in real development workflows(e.g. code generation, refactoring, prototyping) Product mindset, speed, and autonomy in early-stage development Strong communication and teamwork skills — you’re proactive, listen with intention, and use clear writing to bring ideas to the table and keep everyone aligned. Professional level of English Benefits International Projects Small Teams Flat Structure Friendly Atmosphere Flexible Hours Individual Career Path We want your TALENT! Don’t hesitate and APPLY! We are happy to tell you more details about this position in a phone call. Our recruitment process is very fast and straightforward to ensure a great experience from the first interview to joining your dream team!