April 25, 2026

Principal Software Engineer

Senior • Hybrid

190 - 260 PLN

Krakow, Poland

Principal Platform Engineer at Manufacturo

190-260 PLN/H

Hybrid – Kraków

B2B role

Manufacturo powers operations for companies building satellites, fusion reactors, next-generation aircraft, and hypersonic vehicles. Our clients are working on some of the most advanced industrial programs in the world — and they rely on software that can keep up. Companies such as Hermeus, Relativity Space, and Sierra Space use Manufacturo to run complex manufacturing operations with greater control, traceability, and speed.

We're a SaaS company with a team that includes former leaders from SpaceX. We move fast, operate globally, and make decisions swiftly - because the people we serve can't afford anything less. Your voice will be heard here, and the work you do will have a real impact on the world.

We are hiring a Principal Software Engineer to help shape the technical future of our platform. This role is for someone who wants to solve hard backend problems, guide architecture with sound judgment, and raise the level of other engineers through mentorship, communication, and strong engineering standards.

The Role

As a Principal Platform Engineer at Manufacturo, you'll work at both levels: deep in the hardest problems on the platform, and wide enough to set the standard for others to follow. You'll define the architecture, raise the quality bar, and make sure the right technical decisions are made, not by directing from a distance, but by being the person in the room whose opinion carries weight because the work backs it up. 

This role requires both deep hands-on technical contribution and the ability to multiply the impact of others. We need someone who can take on the hardest problems while also helping senior developers and leads make better technical decisions through teaching, feedback, and clear standards.

You will report directly to the Director of Software Engineering and act as their technical partner across the organization. This is a individual contributor role with no people management responsibilities.

You should be comfortable working in a high-change environment where priorities evolve, new information appears quickly, and strong technical judgment is needed to keep teams moving in the right direction without losing quality.

What you'll do

  • Own the architecture and technical direction of the platform’s core 

  • Tackle the hardest engineering problems, including performance bottlenecks, complex integrations, and architectural evolution 

  • Define and evolve backend engineering standards across all teams 

  • Lead design reviews and author RFCs/ADRs for high-impact technical decisions 

  • Partner with the Director of Software Engineering, Product, and engineering leadership to assess technical feasibility early, shape direction, and resolve tradeoffs before they become delivery problems 

  • Mentor senior engineers code reviews, architecture workshops, pair programming, technical discussions, and tech talks that improve how the organization designs, builds, and operates software 

  • Raise the quality bar across the backend through example, teaching, and clear standards

Required skills & experience

  • 8+ years of backend engineering experience, with deep, proven mastery of C# and modern .NET 

  • A demonstrated track record operating successfully in a Staff Engineer, Principal Engineer, or Senior Tech Lead role 

  • Proven experience architecting, building, and owning large, complex systems end-to-end, including both monolithic and distributed architectures 

  • Expert-level SQL and database design skills, including diagnosing slow queries in production and designing schemas that hold up under real load 

  • Deep practical expertise with Entity Framework, including performance tradeoffs, query behavior, and data access strategy 

  • Strong architectural judgment and experience applying concepts such as DDD and clean architecture pragmatically 

  • A strong quality mindset, including test automation strategy and clear standards for what “done” means 

  • Strong written and verbal communication skills in English — you are comfortable explaining technical tradeoffs, mentoring other engineers, leading code reviews, and facilitating architecture discussions 

  • Enthusiasm for and hands-on proficiency with AI coding tools such as Cursor and Claude Code as productivity multipliers

Nice to have
You'll stand out if you bring any of the following:

  • Hands-on experience with cloud infrastructure at scale, with Azure being a strong advantage

  • Experience with Angular or a modern frontend framework - enough to make informed architectural decisions across the full stack

  • Familiarity with Azure DevOps and CI/CD pipeline design at an organizational level, not just usage

  • Experience designing for compliance-driven deployment constraints - data sovereignty, tenant isolation, and schema management across numbers of independent databases

  • Background or genuine curiosity about Manufacturing Execution Systems (MES) -understanding the domain makes the hardest problems tractable


Our tech stack

  • Backend: .NET, C#, Entity Framework, SQL Server / Azure SQL 

  • Messaging: Azure Service Bus, MassTransit 

  • Observability: OpenTelemetry, Grafana stack 

  • Frontend: Angular, our own Angular Component Library 

  • Cloud: Azure 

  • CI/CD: Azure DevOps 

  • AI tooling: Cursor, Claude Code, and other modern AI-assisted development tools

What you’ll get in return

  • Real authority, real access. Direct collaboration with the CPO and Director of Development. Your decisions will be heard, debated, and acted on - with organizational backing to make standards stick.

  • Customers building the next century. Rockets, fusion reactors, hypersonic systems. The problems you solve here have consequences that matter.

  • People who will match you. You'll work alongside engineers and leaders with backgrounds from SpaceX and other high-bar organizations. Expect to be challenged, not just followed.

  • AI at the foundation, not the edge. You'll be building the architecture that makes AI native to the platform - not retrofitting it later.

  • Hybrid working with three days in our Kraków office, comprehensive healthcare including life insurance, and a Multisport Card.

  • This role is for someone serious about their craft. If that is you, we would like to talk.

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🏢 Summary: Senior Software Engineer role focused on building and operating a cloud-native engineering platform using .NET and Azure. The position centers on developing scalable platform services, Infrastructure as Code, and CI/CD automation to enhance developer productivity. You will drive DevOps practices, cloud infrastructure standardization, and platform observability in a fast-paced environment. 🗂️ Requirements: 5+ years of software development experience, Strong proficiency in C# and .NET, Hands-on experience with Microsoft Azure, Experience with Infrastructure as Code, Experience with CI/CD systems and DevOps pipelines, Experience with containers and orchestration tools, Ability to design scalable and secure cloud-native architectures, Agile team experience 📃 Skills: C#, .NET, Azure, Terraform, Bicep, ARM, CI/CD, DevOps, Docker, Kubernetes, AKS, IaC 🏢 Description: Posting Type Hybrid / Remote Job Overview We are looking for a Senior Software Engineer to join our Engineering Platform team, where you'll help build the cloud-native backbone that powers Relativity’s development ecosystem. You will work on high-impact initiatives that shape how our engineers build, test, deploy, and scale software—driving technical excellence across the company. As part of a growing and financially stable organization, you’ll have the opportunity to contribute in a dynamic, fast-moving environment that values autonomy, ownership, and practical action over excessive process. Our platform engineers are trusted with solving complex problems at scale, and empowered to make real decisions that improve the day-to-day experience of hundreds of developers. Job Description and Requirements Key Responsibilities Design, build, and operate platform services and developer tooling using .NET and Microsoft Azure that are scalable, secure, and reliable. Lead the development of Infrastructure as Code (IaC) components that automate and standardize cloud infrastructure. Drive adoption of DevOps practices and CI/CD automation across engineering teams. Collaborate closely with internal stakeholders to build reusable capabilities that improve development speed and consistency. Integrate observability, performance monitoring, and self-service tooling into the platform ecosystem. Mentor and support engineers through code reviews, technical discussions, and knowledge-sharing. Proactively identify areas of improvement, experiment with solutions, and deliver results—embracing our bias toward action. Contribute to initiatives that embed AI/ML into platform services and developer workflows. Qualifications 5+ years of software development experience with a strong command of C# and the .NET ecosystem. Deep hands-on experience with Azure services and cloud-native application patterns. Proficiency with Infrastructure as Code tools such as Terraform, Bicep, or ARM templates. Experience building or supporting CI/CD systems and modern DevOps pipelines. Familiarity with containers and orchestration tools (e.g., Docker, Kubernetes, AKS). Demonstrated success working in Agile product teams and collaborating cross-functionally. Strong problem-solving, communication, and mentorship skills. Bonus: Exposure to AI/ML tools or interest in applying AI to platform and engineering problems. Why Join Us? Be part of a growing, stable company where your work has long-term impact. Thrive in a fast-paced, evolving environment with clear opportunities for technical and career growth. Work in an engineering culture that values initiative, speed, and ownership. Shape the tools, practices, and environments that empower hundreds of engineers daily. Contribute to a mission-driven organization committed to innovation and excellence. Relativity is a diverse workplace with different skills and life experiences—and we love and celebrate those differences. We believe that employees are happiest when they're empowered to be their full, authentic selves, regardless how you identify. Benefit Highlights: Comprehensive health, dental, and vision plans Parental leave for primary and secondary caregivers Flexible work arrangements Long-term incentive program Training investment program All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, or national origin, disability or protected veteran status, or any other legally protected basis, in accordance with applicable law. Relativity is committed to competitive, fair, and equitable compensation practices. This position is eligible for total compensation which includes a competitive base salary, an annual performance bonus, and long-term incentives. The expected salary range for this role is between following values: 208 000 and 312 000PLN The final offered salary will be based on several factors, including but not limited to the candidate's depth of experience, skill set, qualifications, and internal pay equity. Hiring at the top end of the range would not be typical, to allow for future meaningful salary growth in this position. Required Skills: Automation, Data Analysis, Database Management, Network Architecture, Performance Optimizations, Problem Solving, Project Management, Software Development, System Designs, Technical Leadership

Technology

Superdevs

Team Lead .NET Developer

Senior

Remote

160 - 190 PLN

🏢 Summary: Remote Team Lead Software Development role focused on leading a cross-functional engineering team while staying hands-on with backend and web service architecture and implementation in a .NET environment. The position combines technical leadership, product collaboration, and ownership of architectural decisions in an agile setup. You will drive engineering quality, technical standards, and team growth while contributing directly to code and system design. 🗂️ Requirements: Several years of experience in software development with .NET / C#, Minimum 3 years of experience leading development teams, Strong knowledge of software design patterns, Strong understanding of system architecture, Experience with modern engineering practices, Hands-on experience with backend and web services development, Experience using AI in software development process, Fluent English 📃 Skills: .NET, C#, AI, Elasticsearch, RabbitMQ, Redis, Azure, CI/CD, Umbraco, Containers, Backend, WebServices, Architecture, Agile 🏢 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 an experienced Team Lead Software Development who combines strong technical expertise with leadership skills and a product-oriented mindset. In this role, you will take ownership of development teams, supporting both its technical direction and people development. You will lead a cross-functional engineering team of around 7–9 people , including Frontend, Backend, and QA specialists. The team works in an agile setup and collaborates closely with a Product Owner, UX Design, DevOps, and ITOps. Responsibilities Lead, coach, and support the development of your engineering team Help your team grow into a high-performing, self-organized unit Act as a sparring partner for the Product Owner and actively contribute to roadmap planning and prioritization Stay hands-on with the design, architecture, and implementation of backend and web services Make and own technical decisions, while communicating them clearly to stakeholders Improve agile processes within the team and continuously optimize the way of working Contribute to solution and domain design Strengthen engineering quality, good practices, and technical standards Take part in recruitment interviews and support the further development of the team 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 Several years of experience in software development with .NET / C# At least 3 years of experience leading development teams, both technically and people-wise Experience using AI in the software development process Strong understanding of software design patterns, system architecture, and modern engineering practices A hands-on approach and the ability to stay close to the code when needed Strong communication skills and the ability to explain technical topics clearly to both technical and non-technical stakeholders A pragmatic mindset — you care about quality, but you also understand business priorities Fluent English, German is a plus Nice to have Experience with Elasticsearch, RabbitMQ, Redis, containers, Azure Cloud, CI/CD, Umbraco Experience working in a scale-up environment Knowledge of the financial market or financial products 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!

Technology

Medius

Mid Software Engineer

Mid

Hybrid

Krakow, Poland

17,000 - 22,000 PLN

🏢 Summary: The offer is for a Software Engineer to build and scale a next-generation cloud-based platform using Azure, .NET Core, React, and TypeScript. The role focuses on designing scalable cloud services, applying DDD and CQRS patterns, integrating AI tools into the development workflow, and maintaining high code quality. It combines backend and frontend development with cloud architecture responsibilities in an agile environment. 🗂️ Requirements: 3+ years professional software development experience, Strong proficiency in C#, Strong proficiency in .NET, Hands-on experience with React or equivalent frontend framework, Experience with TypeScript or JavaScript, Practical knowledge of DDD and CQRS patterns, Experience deploying and operating services on Microsoft Azure, Experience designing and maintaining RESTful APIs, Experience with relational databases, Experience using AI development tools, Strong testing practices in production software, English B2 or higher 📃 Skills: C#, .NET, React, TypeScript, JavaScript, Azure, DDD, CQRS, REST, SQL, GitHubCopilot, LLM 🏢 Description: At Medius , we believe finance should empower strategy, not stress. Founded in Sweden in 2001, we’ve grown from a local startup into a global leader in cloud-based spend management . Thousands of organizations trust our AI-powered solutions to simplify processes, eliminate manual work, and give finance teams clarity, confidence, and control . We’re more than a software company – we’re a global team of problem-solvers and innovators reinventing accounts payable. Our culture thrives on freedom, curiosity, and continuous improvement, giving you space to focus on what matters – and still have time to live your best life. If you want to make a real impact, see your ideas come to life, and shape the future of finance, Medius is the place for you. Job overview We are looking for a highly skilled Software Engineer to join our Kraków-based team as we scale our next-generation, true cloud service. Supporting over 1,000 global clients, our main platform is built on a modern stack of Azure, .NET Core, React, and TypeScript. In this role you will do more than write code; you will influence the product’s future by designing scalable solutions and championing the integration of AI to revolutionize our development lifecycle. Success in this role means balancing high-velocity feature delivery with long-term architectural health. What you'll do: Build and maintain scalable cloud services that can handle the load a global customer base puts on them. Apply Domain-Driven Design (DDD) principles in practice — modular, maintainable code, not just the vocabulary. Use AI tools (GitHub Copilot, LLM assistants, etc.) as a genuine part of your workflow — code generation, refactoring, documentation, test writing. Design and maintain RESTful APIs that integrate cleanly within a complex cloud environment. Work with Azure services and make sensible trade-offs between performance, cost, and security. Collaborate with engineers, product owners, and designers in an agile team — contribute to the work and to the culture. Write good tests, participate in code reviews, and hold a high bar for code quality. Keep an eye on emerging tooling and bring back what's actually useful. Qualifications: 3+ years of professional software development experience, strong with C# and .NET. Hands-on frontend experience — React (or equivalent), TypeScript/JavaScript. Practical familiarity with DDD and CQRS patterns, not just theoretical knowledge. Experience deploying and operating services on Microsoft Azure. Some real experience using AI tools to speed up development — and genuine curiosity to go further. Solid with relational databases and RESTful API design. Strong testing habits and a track record of maintaining quality in production software. CS degree or equivalent experience. English at B2 or above — you can explain technical decisions clearly to non-technical stakeholders. You take ownership of your work and invest in your own growth and in the team's. Why Medius : Well-being perks: Multikafeteria program, private healthcare (LuxMed), life insurance Fun & connection: Summer & Christmas parties, Game Board nights, spontaneous team events Growth & impact: Be part of a team where your ideas matter, innovation thrives, and your work is visible globally