Are you a seasoned developer ready to work on cutting-edge financial technology? We are looking for a Senior/Principal Full Stack Developer to join an ambitious global SaaS project in the finance domain. You will be part of a team building and optimizing mission-critical payment processing systems used by businesses worldwide.
At Sigma Software, we value innovation, technical excellence, and collaboration. This role offers the opportunity to work with modern technologies across both backend and frontend, contributing to a platform that is reshaping revenue operations. Join us and enjoy working in an environment that supports professional growth, knowledge sharing, and impactful projects.
CUSTOMER
Our customer is a global SaaS company specializing in AI-native revenue platforms for modern finance and accounting teams.
PROJECT
Their solutions streamline subscription management, billing, and revenue operations for businesses of various sizes. The company is recognized for its innovation in automating complex financial workflows, integrating with leading payment gateways, and ensuring compliance with industry standards.
- Design, develop, and maintain backend and frontend components for the revenue platform
- Build and optimize APIs, services, and integrations to ensure performance, scalability, and reliability
- Collaborate with cross-functional teams to define requirements, design solutions, and deliver features
- Contribute to backend development (Python) and frontend development (TypeScript/JavaScript)
- Participate in architectural planning and technical decision-making
- Ensure code quality through best practices, reviews, and testing
- Troubleshoot and resolve technical issues across the stack
- Mentor team members and share knowledge to enhance team capability
- 5+ years of professional software development experience, with a strong focus on Python
- Proficiency in JavaScript and TypeScript
- Hands-on experience with FastAPI and Temporal (or similar workflow orchestration tools)
- Solid understanding of backend architecture, API design, and microservices
- Experience integrating frontend and backend components in a full stack environment
- Strong problem-solving skills and ability to work independently on complex tasks
- Familiarity with cloud environments (AWS, GCP, or Azure) and CI/CD pipelines
- Excellent communication skills and ability to collaborate effectively in a distributed team
- Upper-Intermediate level of English
Top Skills
What We Do
Sigma Software Group, an award-winning and trusted IT partner, has been serving customers for over 21 years, providing comprehensive IT solutions to various businesses, ranging from startups to established software product houses. As one of Europe's substantial IT consultancies, it brings together a dedicated workforce of over 2,100 professionals in 40 offices across 19 countries. With a diverse client base, including more than 300 enterprises, including Fortune 500 stalwarts, Sigma Software Group is a preferred choice for developing solutions that help businesses create cutting-edge products while meeting their unique needs.
Sigma Software Group operates as a dynamic ecosystem of tech companies, offering 25 ready-to-implement innovative products and 40+ value-added services. Furthermore, Sigma Software Group is committed to fostering innovation through initiatives such as the Sigma Software Labs business incubator, Sigma Software University, the SID Venture Partners VC Fund, UA Tech Network, Techosystem, the European Business Association, and other collaborative efforts.
Since 2015, Sigma Software Group has consistently earned recognition on the IAOP's prestigious World's Top 100 Outsourcing list. The company's accomplishments have also been acknowledged by prominent global media outlets such as Forbes, CNBC, The Times, and Reuters
