Strong Middle / Senior Full Stack Developer

Required skills

• JavaScript / TypeScript / expert

• NestJS / expert

• React / good

• AWS / good

• English / expert

• Join a product-focused engineering team developing a large-scale AdTech platform used for managing and optimizing digital advertising campaigns across multiple channels.

• We are looking for a Strong Middle / Senior Full Stack Developer with strong TypeScript expertise, solid Back-end development experience with NestJS, and hands-on Front-end experience with ReactJS. In this role, you will work on enterprise-level solutions with complex business workflows, media processing pipelines, and deep integrations with advertising ecosystems.

• We at Sigma Software offer the opportunity to work on technically challenging products, collaborate with experienced engineering teams, and contribute to scalable solutions used in a dynamic digital advertising domain.

• Customer

• Our Customer is an international company operating in the digital advertising and AdTech industry. The company develops enterprise-grade technology solutions that help advertisers and media organizations manage, optimize, and scale digital advertising campaigns. Their products support high-load advertising operations, complex workflows, and media-related processes across modern advertising ecosystems.

• Project

• The project is a large-scale advertising campaign management platform covering the full lifecycle of digital campaigns. The solution includes campaign creation and configuration, line-item management, creatives handling, forecasting, SLA tracking, and integrations with external advertising and media services. The platform also supports advanced media workflows such as video transcoding and image validation.

• The engineering team is focused on building scalable and reliable enterprise solutions with sophisticated business logic and multiple integrations while continuously improving performance, maintainability, and operational efficiency.

Requirements

• 4-5+ years of commercial software development experience with JavaScript and TypeScript, with a primary focus on back-end development

• Strong Back-end development experience with NestJS

• Solid Front-end development experience with ReactJS

• Hands-on experience with AWS cloud services

• Good understanding of scalable system architecture and software engineering best practices

• Experience working with enterprise-level or high-load applications

• Strong problem-solving and analytical skills

• Ability to work independently and take ownership of technical solutions

• Good communication and collaboration skills

• Upper-Intermediate or higher English level

• WILL BE A PLUS

• AI-native development experience

• Familiarity with AI-powered development tools such as Claude and Codex

• Experience with Jenkins

• Experience with Terraform

• Experience working with complex or enterprise platforms

• Personal Profile

• Proactive and self-driven mindset

• Strong ownership attitude

• Team-oriented and collaborative approach

• Ability to work effectively in a fast-paced engineering environment

• Strong attention to code quality and technical excellence

Responsibilities

• Design, develop, and maintain scalable Full Stack applications using JavaScript, TypeScript, NestJS, and React
• Implement and support complex business logic related to digital advertising campaign management
• Participate in technical discussions, architecture decisions, and solution design activities
• Collaborate closely with developers, Architects, QA engineers, and Project Managers
• Improve application performance, scalability, reliability, and maintainability
• Develop clean, maintainable, and well-tested code following software engineering best practices
• Identify technical challenges proactively and drive solutions independently
• Contribute to continuous improvements in development processes and technical standards