BackEnd Developer (C# / SQL)

Craftware is a technology company of over 500 experts, empowering large organizations to solve complex business challenges with modern IT solutions - from sales systems and automation to data platforms and AI. We operate where technology must be reliable, secure, and scalable. We deliver end-to-end projects: from analysis and architecture through implementation to development and maintenance. We are a trusted partner of industry leaders such as Salesforce, Veeva, UiPath, and Databricks. Model: remoteEmployment type: full-timeRole summaryWe're looking for a Back End Developer who doesn't stop at the symptom, but digs until they find the root cause. You'll work with C# and SQL to build and maintain reliable application logic, while keeping the whole picture in view: frontend, APIs, data, integrations, testing, deployment, and monitoring. This role is for an engineer who values clean, maintainable solutions over code volume, delivers in small, reviewable increments, and keeps the end user's outcome at the center of every decision. ResponsibilitiesDevelop and maintain back-end components – design, build, and improve application logic in C#, with a focus on clarity, maintainability, and reliability. Work with data and databases – write, optimize, and maintain SQL queries and data structures that support application features and integrations. Investigate and solve problems at their root – analyze issues across the full application flow (frontend, APIs, data, integrations, deployment, monitoring) instead of patching visible UI symptoms. Deliver in focused increments – break work into small, well-scoped tasks, recognize scope creep early, and ship small, reviewable pull requests rather than oversized or over-engineered changes. Collaborate and communicate effectively – work closely with the team on technical decisions, share context clearly, and keep user outcomes as the main measure of success. Must-have: Commercial experience in back-end development with C#Strong SQL skillsSolid programming fundamentals and experience with modern web developmentStrong problem-solving skills and the ability to investigate root causesAbility to reason across the full application flow: frontend, APIs, data, integrations, testing, deployment, and monitoringDependable delivery: breaking work into focused increments and delivering small, reviewable changesPreference for clear, maintainable solutions and effective communication over unnecessary complexityFluent English, both written and spokenNice-to-have: Familiarity with AWSKnowledge of Redux or another state management libraryExperience with CI/CD tools (TeamCity, Jenkins, etc.)Experience with microfrontendsWe offer: B2B contract (rate negotiated individually, up to 200 PLN net/h + VAT)Fully remote service deliveryBroad range of projects (internal, international) - genuine variety of clients and tasksBudget for skills development and certifications as part of the collaborationRegular collaboration reviews and discussion of project scopeAdditional benefits available as part of the collaborationNetworking and team-building events for project teams