Sr. Software Developer

FinFit; Poland; Remote; PLN 120,000 - 160,000; Full time

Job summary

A technology firm in Poland is seeking a Senior Software Developer to join agile teams focused on delivering scalable solutions using ASP.NET and SQL Server. This role requires strong expertise in full-stack development, collaboration with cross-functional teams, and a commitment to continuous improvement. Ideal candidates will have over 10 years of experience in software development with a strong problem-solving mindset.

Qualifications

• Minimum 10 years of professional full-stack development experience.
• Experience in customer-facing environments with production support responsibilities.
• Recent relevant certifications in Microsoft, Azure, or cloud technologies are a plus.

Responsibilities

• Design, build, and enhance applications using C#, ASP.NET MVC/Core, SQL Server.
• Troubleshoot and resolve production incidents efficiently.
• Collaborate cross-functionally with QA and product owners to deliver quickly.

Skills

ASP.NET (C#) development

SQL Server object development

Azure DevOps

Service-oriented APIs

Agile development practices

Education

Bachelor’s degree in computer science or related field

Tools

Git-based source control

CI/CD pipelines

Job description

Overview

The FinFit Senior Software Developer plays a key role in delivering value through rapid, iterative development and proactive support across a variety of customers and technologies. Operating within small, Agile teams, this role translates complex business requirements into scalable, secure, production-grade solutions built with ASP.NET (MVC/Core), C#, .NET Framework, .NET Core, javascript frameworks, and SQL Server.

Developers rotate between feature delivery and support, embracing a DevOps mindset of ownership and accountability. The Senior Software Developer works closely with customers, partners, and internal stakeholders, requiring excellent technical expertise, communication skills, and collaboration.

At FinFit, we foster a culture of continuous improvement, automation, and rapid delivery - deploying to production frequently with a predictable cadence and issuing hotfixes for critical issues when needed. Our teams also leverage AI-powered tools to accelerate support, enhance development workflows, and improve overall productivity. Above all, we pride ourselves on being a collaborative, team-oriented environment where success is shared and everyone contributes to delivering the best outcomes for our customers.

Responsibilities

• Design, build, and enhance applications using C#, ASP.NET MVC/Core, SQL Server, and modern front-end frameworks.
• Create and optimize SQL Server schemas, stored procedures, queries, and indexing strategies for performance and scalability.
• Triage, troubleshoot, and resolve production incidents, performing root-cause analysis and implementing long-term preventive solutions.
• Contribute to observability practices (logging, monitoring, alerting) to ensure system reliability and uptime.
• Collaborate cross-functionally with QA, product owners, and support to deliver features and fixes rapidly.
• Leverage AI-assisted tools and automation to accelerate bug resolution, improve code quality, and streamline development workflows.
• Continuously optimize code for performance, security, scalability, and maintainability.
• Share knowledge through code reviews, mentoring, and team collaboration.
• Uphold and contribute to FinFit’s processes, policies, and performance standards, while seeking opportunities for continuous improvement.

Skills & Qualifications

• Strong proficiency in ASP.NET (C#) development with experience in MVC/Core and modern front-end frameworks.
• Expertise in SQL Server object development (Stored Procedures, Tables, Views, Functions, Indexes, Triggers).
• Hands-on experience with Azure DevOps, including work item tracking, Git-based source control, and CI/CD pipelines.
• Experience designing and consuming scalable, service-oriented APIs (REST, SFTP, JSON).
• Understanding of cloud-native concepts, including scalability, resilience, automation, and observability.
• Ability to debug and resolve complex production performance issues using profiling and monitoring tools.
• Experience using AI-assisted development or support tools to improve efficiency and quality.
• Strong knowledge of Agile and iterative development practices.
• Ability to decompose user stories into detailed deliverables with reliable estimates.
• Excellent problem-solving, analytical, and communication skills with a customer-first mindset.
• Positive, collaborative team player with a growth mindset and a commitment to team success.

Education & Experience

• Minimum 10 years of professional full-stack development experience.
• Bachelor’s degree in computer science or related field, or equivalent practical experience.
• Recent relevant certifications in Microsoft, Azure, or cloud technologies are a plus.
• Experience working in a customer-facing environment with production support responsibilities.

Why FinFit?

At FinFit, we believe in rapid delivery, rapid support, and continuous improvement. Our developers take ownership of their work end-to-end, from design through deployment and support. We value innovation, teamwork, and accountability, leveraging the latest AI-powered tools to deliver faster and better results. Our collaborative, team-oriented culture ensures that everyone grows, learns, and succeeds together - all while keeping our customers delighted with every release.