Senior Full-Stack Developer
This is a high-impact role for a senior engineer who excels in a 60/40 front-end/back-end split within a modern SaaS environment. You will have full ownership over complex, data-heavy features for a global FinOps platform, working in a lean team that prioritizes autonomy and technical excellence. It is a perfect fit for a proactive developer who enjoys solving performance bottlenecks and building sophisticated analytical dashboards.
Newxel
Warsaw, Masovian, Poland · Posted 1 May 2026
The role
Overview
The hiring side
About Newxel
Newxel is a mid-sized employer working in saas / finops, based in Warsaw, Masovian, Poland.
SaaS / FinOps
Medium
Warsaw, Masovian, Poland
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Research NewxelWhat they need
Requirements & Skills
Key Responsibilities
- Architect and develop advanced UI components and data dashboards using React
- Implement scalable server-side logic and APIs using Python
- Manage the full lifecycle of features including testing and AWS deployment
- Optimize system performance for large-scale data aggregations
- Collaborate with cross-functional teams to define technical requirements
- Maintain code quality through rigorous troubleshooting and bug fixes
Essential
- Minimum of 6 years of professional software development experience
- Strong proficiency in React and JavaScript/TypeScript for front-end development
- At least 2 years of experience building back-end APIs and services using Python
- Proven track record of managing large-scale datasets and performance-critical flows
- Experience with cloud-native environments, specifically AWS
- Solid understanding of SQL and NoSQL databases, including DynamoDB and BigQuery
- Ability to own features end-to-end from design to deployment
- Comfortable spending roughly 50% of time on troubleshooting and performance optimization
Preferred
- Experience in the B2B SaaS industry
- Background in developing data-centric products or FinOps platforms
- Familiarity with interactive data visualizations and complex graphing tools
- Experience using AI-assisted development tools to enhance workflow
Key Skills
Networking
People to Know
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Perks
Benefits & perks
- Competitive salary package
- Comprehensive medical insurance
- Fully remote work flexibility
- Collaborative and innovative team culture
- Professional development and career growth opportunities
Next step
Apply now
Found via newxel.com