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Senior Software Engineer

Poland, Krakow · Job Posted February 16, 2026
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Job Description

It's fun to work in a company where people truly believe in what they're doing! At BlackLine, we're committed to bringing passion and customer focus to the business of enterprise applications. Since being founded in 2001, BlackLine has become a leading provider of cloud software that automates and controls the entire financial close process. Our vision is to modernize the finance and accounting function to enable greater operational effectiveness and agility, and we are committed to delivering innovative solutions and services to empower accounting and finance leaders around the world to achieve Modern Finance. Being a best-in-class SaaS Company, we understand that bringing in new ideas and innovative technology is mission critical. At BlackLine we are always working with new, cutting edge technology that encourages our teams to learn something new and expand their creativity and technical skillset that will accelerate their careers.

Job Responsibility

  • Provide technical expertise and leadership in the design, development, and delivery of BlackLine’s products, while adhering to timelines, coding standards, requirements, and quality
  • Collaborate/lead on architect, design, develop, test, troubleshoot, debug, optimize, scale, maintain and improve software applications, driving the delivery of high-quality value and features to BlackLine’s customers
  • Develop functional and technical specifications, and test plans
  • Review others’ code
  • Develop and document functional and technical requirements
  • Collaborate with other team members and other teams on all the above
  • Design and communicate coding standards, architectural plans, solve complex design and architectural problems, create robust architectural solutions
  • Implement, refine, and enforce software development techniques to ensure that delivered features meet software integration, performance, security, and maintainability expectations
  • Research, test, benchmark, and evaluate new tools and technologies, and recommend ways to implement them in product development
  • Maintain high standards of software quality and technical excellence within the team by establishing good practices and habits and writing clean, testable, maintainable, and secure code
  • Be part of an Inspire a forward-thinking team of developers, acting as an agent of change and evangelist for a quality-first culture within the organization
  • Mentor and coach team members and guide them to solutions on complex design issues
  • Proactively identify issues, bottlenecks, gaps, or other areas of concern or opportunity and work to either directly affect change, or advocate for that change by working with peers and leadership to build consensus and take action
  • Perform critical maintenance, deployment, and release support activities, including occasional off-hours support
  • Act as a key technical partner and enabler for product-facing teams, providing guidance and support for effective platform adoption and integration
  • Modernize a key Platform in Blacklines Invoice to Cash, migration and evolving an existing PHP based solution to Microservice based .net platform

Requirements

  • 4/6+ years of experience with software development in general purpose programming languages including but not limited to C#, .NET, .NET Core
  • 5+ years of hands-on experience in building Web Applications, SaaS products, and RESTful APIs
  • BS degree in Computer Science, or equivalent experience
  • Experience with front-end technologies (HTML, JavaScript, CSS, JavaScript Frameworks, etc.) is a plus
  • A solid computer science foundation including data structures, algorithms, and design patterns, with a proven track record of software design and architecture of complex systems
  • Experience with public cloud architectures (Azure, AWS or GCP) and cloud native services
  • Experience in service-oriented architecture and aspect-oriented programming
  • Experience as a technical influencer for highly scalable distributed system designs
  • Experience with container management solutions like Mesos, Kubernetes or Nomad
  • Experience with API gateway, identity management, authentication, messaging platforms (e.g: Kafka, SQS, RabbitMQ), workflow orchestration tools, job scheduling and search
  • Experience with multi-threading and concurrency
  • Experience as a technical lead on significant development initiatives
  • Superior analytical and problem-solving abilities
  • Proven experience implementing an experience layer or API ecosystem for complex systems
  • Demonstrated ability to implement API monitoring solutions for robust system performance and reliability
  • Expertise in implementing strong observability (logging, metrics, tracing) across distributed microservices architectures
  • Excellent written and verbal communication skills
  • Adaptable team player with strong collaboration skills and a focus on results and value delivery
  • Prior working experience in Scrum, or other Agile development methodologies, is preferred
  • Passion for engineering excellence through automation, unit testing, and process improvements

Nice to have

  • Experience with front-end technologies (HTML, JavaScript, CSS, JavaScript Frameworks, etc.) is a plus
  • Prior working experience in Scrum, or other Agile development methodologies, is preferred

What we offer

  • A technology-based company with a sense of adventure and a vision for the future
  • A culture that is kind, open, and accepting
  • A culture where BlackLiner's continued growth and learning is empowered
  • BlackLine offers a wide variety of professional development seminars and inclusive affinity groups to celebrate and support our diversity

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