Senior Full-Stack Developer (Python + React)

• Design, develop, and maintain scalable web applications and services across the full stack
• Build intuitive and responsive user interfaces using React.js with JavaScript/TypeScript
• Develop backend services and APIs using Python or Node.js, integrating with SQL/NoSQL databases and cloud services
• Implement AWS Lambda functions for scalable, serverless workflows
• Optimize application performance, ensuring high availability and scalability
• Collaborate with product managers, designers, and engineers to deliver high-quality solutions
• Write clean, maintainable, testable code following industry best practices
• Troubleshoot, debug, and resolve technical issues across the stack
• Participate in code reviews and uphold coding standards
• Design and document APIs using OpenAPI (Swagger)
• Develop unit tests to ensure code quality and reliability
• Stay current with emerging technologies and trends

• 5+ years of full-stack web development experience (frontend + backend)
• Proven experience deploying applications on public cloud platforms
• Strong proficiency with React.js, JavaScript, and TypeScript
• Experience with backend frameworks in Python (Flask, Django, FastAPI)
• Familiarity with serverless architecture and microservices patterns
• Strong understanding of RESTful APIs and frontend-backend integration
• Experience with SQL and/or NoSQL databases
• Knowledge of web application security best practices
• Experience with testing frameworks (Jest, Cypress, PyTest, Mocha)
• Proficiency with Git and CI/CD pipelines
• Upper-Intermediate level of English, with ability to participate in active communication with the customer and team

PERSONAL PROFILE

• Excellent communication and interpersonal skills, with the ability to collaborate effectively with cross-functional teams and stakeholders
• Strong problem-solving and decision-making skills, with a focus on driving results and meeting deadlines
• Self-motivated, adaptable, and eager to learn new technologies and frameworks

Are you a passionate Full Stack Developer ready to work on cutting-edge cloud solutions? We are looking for a Middle/Senior specialist to join our remote team and contribute to a dynamic, long-term project.

At Sigma Software, we build high-quality software for global companies, combining modern technologies with a culture of innovation. You will be part of a skilled, collaborative team working on complex integrations and scalable systems in a fast-paced environment.

Why join us? You’ll work with modern tech stacks, have the flexibility of remote work, and be part of a company that values continuous learning, professional growth, and delivering impactful solutions to worldwide customers

CUSTOMER

Our customer is ConnectWise, a US-based software company specializing in IT management and business automation solutions for Managed Service Providers (MSPs). ConnectWise serves thousands of partners worldwide and is recognized for its innovative approach to cloud-based IT solutions, helping technology service providers streamline operations, enhance cybersecurity, and improve customer relationships.

PROJECT

You will join the x360Portal Team, which owns a React-based portal web application and AWS services. The platform manages user permissions, authentication, public APIs, billing domains, and integrations with other product teams and systems, including Salesforce.

Current major initiatives include:

• Provisioning & SSO Integration for a seamless partner experience
• Salesforce Migration to a unified instance
• React Neon UI migration to an MUI-based unified framework

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