Senior Fullstack Engineer (.NET/React)

Relativity; Remote; PLN 181,000 - 271,000; Full time

Job summary

A leading software company is seeking a Senior Software Engineer to join their team in Białystok, Poland. In this role, you will design, write, test, deploy, and support software products with an established engineering team. The ideal candidate should have strong experience with React and TypeScript, distributed SaaS systems, and effective CI/CD automation practices. This position offers a competitive salary range of 181,000 to 271,000 PLN, along with comprehensive health benefits and flexible work arrangements.

Benefits

Comprehensive health, dental, and vision plans

Parental leave for primary and secondary caregivers

Flexible work arrangements

Two, week-long company breaks per year

Additional time off

Long-term incentive program

Training investment program

Qualifications

• 5+ years of experience developing with React and TypeScript.
• Experience with cloud-native delivery, preferably Azure.
• Ability to mentor team members in frontend development.

Responsibilities

• Design and develop the architecture for Import/Export services.
• Build accessible, performant UIs with modern React.
• Shape the roadmap with Product through data-backed decisions.

Skills

Advanced React with TypeScript

Front-end testing integrated into CI/CD

5+ years with C#/.NET or similar services

Experience designing and operating distributed SaaS systems

Production ownership: on-call, RCAs, telemetry-driven MTTR reduction

Cloud-native delivery (Azure preferred)

Hands-on CI/CD automation and deployment governance

Education

Bachelor's in CS/Engineering or equivalent

Job description

Remote

Job Overview

As a Senior Software Engineer, your primary mission will be to design, write, test, deploy, and support our Relativity software products. You will work in an established, senior team with business stakeholders to develop the product, features and services that drive and evolve our Relativity One SaaS.

You will join Relativity’s Import Export organization, a high-impact engineering team at the heart of our Ingestion Department. We build and scale the infrastructure that powers secure, reliable, and high-throughput data movement across our SaaS platform.

Your Role in Action

• Create architecture and non-functional design for Import/Export services that meet SLO/SLA targets
• Decompose complex problems into resilient, cloud-native designs
• Deliver milestones with measurable outcomes
• Advise and mentor team members on code quality, technical debt management, and best practices
• Own production systems by leading on-call procedures, RCAs, and proactive issue resolution that reduce MTTR
• Drive operational excellence using observability data to prioritize work, automate alerts, and expose trustworthy metrics
• Shape the roadmap with Product through clear trade-offs and data-backed decisions
• Optimize CI/CD by designing automation that keeps deployments predictable and compliant
• Build front-end architecture for Import/Export UX using React and TypeScript
• Build accessible, performant UIs with modern React (hooks, context) and reliable state management
• Partner with Design to evolve a reusable component library/design system and enforce UI standards

Required Skills

• Advanced React with TypeScript
• Front-end testing integrated into CI/CD
• 5+ years with C#/.NET or similar services
• Experience designing and operating distributed SaaS systems
• Production ownership: on-call, RCAs, telemetry-driven MTTR reduction
• Cloud-native delivery (Azure preferred)
• Hands-on CI/CD automation and deployment governance
• Bachelor’s in CS/Engineering or equivalent; fluent in English

Nice to Have

• Microservice architecture for high-volume event-driven workloads
• Mentoring in frontend development and accessibility
• Building and maintaining design systems/component libraries

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
• Two, week-long company breaks per year
• Additional time off
• 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.

Compensation and Salary

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: 181 000 and 271 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.

Suggested Skills

Automation, Data Analysis, Database Management, Network Architecture, Performance Optimizations, Problem Solving, Project Management, Software Development, System Designs, Technical Leadership