Middle/Senior Front-End Developer

Join a product-focused engineering team building experiences used by millions of users worldwide. We are looking for a Middle/Senior Front-End Engineer who is passionate about creating scalable customer-facing solutions and improving user journeys across onboarding, subscriptions, pricing, and payment flows.

You will work in a highly collaborative environment alongside Product Managers, Designers, QA Engineers, and Back-End Engineers to deliver impactful features that directly support business growth. This role is suitable for specialists with strong React and TypeScript expertise who enjoy combining technical excellence with product thinking.

We at Sigma Software offer the opportunity to work on meaningful large-scale products, influence technical decisions, grow within a mature engineering culture, and collaborate with experienced international teams. Remote/hybrid/on-site format, location, and employment type are to be confirmed.

Customer

Our Customer is an international product company operating a large-scale digital platform with millions of users globally. The company actively invests in improving customer acquisition, onboarding, trial experiences, subscription management, and payment solutions while maintaining a strong engineering and product culture focused on innovation, experimentation, and long-term growth.

Project

You will join one of the product development teams responsible for customer growth and experience optimization initiatives. The team works on strategic product areas including pricing evolution, onboarding journeys, trial conversion, and payment experience improvements.

The project combines modern Front-end development practices with strong cross-functional collaboration and a data-driven product approach. Engineers are encouraged to contribute ideas, participate in technical discussions, and help improve development processes across teams.

Requirements

• 4+ years of commercial software development experience

• Strong expertise in React, TypeScript, JavaScript, and RxJS

• Experience building modern scalable Front-end applications

• Strong understanding of software quality practices and code quality tools such as SonarQube and ESLint

• Experience with automated testing frameworks including Jest, Karma, WebdriverIO, and Cucumber

• Experience working in product-oriented companies and Agile development environments

• Familiarity with modern development tooling and CI/CD practices

• Ability to collaborate effectively within cross-functional teams

• Good communication skills and proactive mindset

• Willingness to learn and contribute beyond Front-end development when needed

• Upper-Intermediate English level or higher

Will be a plus

• Experience with Webpack

• Familiarity with GitLab and GitLab CI

• Experience using ELK stack and Tableau

• Knowledge of PNPM

• Experience with collaboration tools such as Miro

• Exposure to AI-assisted development tools such as Claude Code

• Understanding of Back-end development concepts

Personal profile

• Strong team player with a collaborative mindset

• Product-oriented thinking and customer-focused approach

• Passion for learning and continuous improvement

• Proactive attitude toward innovation and process enhancement

• Ownership mentality and willingness to contribute to team success

• Openness to knowledge sharing and mentoring culture

Responsibilities

• Develop and enhance customer-facing product features focused on onboarding, pricing, subscriptions, and payment experiences

• Build scalable, maintainable, and high-quality Front-end applications using React and TypeScript

• Collaborate closely with Product Managers, Designers, QA Engineers, and Back-End Engineers in a cross-functional environment

• Participate in technical discussions, architecture decisions, and solution design activities

• Ensure code quality through testing, static analysis tools, and engineering best practices

• Write and maintain automated tests for UI and integration scenarios

• Participate in peer code reviews and knowledge-sharing initiatives

• Contribute to improving engineering processes, developer experience, and team collaboration

• Support continuous improvement initiatives that increase engineering efficiency and product quality

• Assist with Back-end related implementation tasks when needed