Senior Fullstack Engineer (React+Node.js)

We are building our internal talent pool of JavaScript Full Stack Engineers to be ready for upcoming projects in the ticketing and fintech space.

The projects you will be matched to sit at the intersection of ticketing systems and financial operations. End users span both businesses (B2B integrations, white-label platforms, operator dashboards) and consumers (B2C checkout flows, booking interfaces, transaction histories).

The nature of our projects is mixed: some involve greenfield development of new features and services, while others require working within and modernising existing legacy codebases. You should be equally comfortable navigating both - writing clean new code and carefully refactoring or extending existing code.

Depending on the project, you may work as part of a client’s embedded engineering team or as part of our own delivery squad. Team sizes vary. What stays constant is the expectation that you bring genuine full-stack capability, take ownership of your work, and communicate clearly with everyone around you.

Requirements:

• Strong experience withNode.js and Express.js and/or Nest.js (5+ years), demonstrating a deep understanding of event-driven architecture, async patterns, server optimization, and production-grade API development;
• Experience with database technologies, including PostgreSQL or MySQL RDSwith proven ability to design complex schemas, optimize queries, implement efficient data access patterns, and leverage Redis caching understanding (read-through, write-through) of high-traffic applications;
• Hands-on expertise with tools like OpenAPI/Swagger/GraphQL, Postmanand processes for API contract testing;
• Strong proficiency with React ecosystem (5+ years), including deep knowledge of React hooks, component lifecycle, advanced state management patterns (Redux/Context API), performance optimization, and complex UI system design;
• Solid experience with modern frontend build pipelines, bundlers (Webpack, Vite), module systems, and optimization techniques for production environments;
• Advanced skills with CSS/CSS-in-JS frameworks (e.g. Tailwind, Styled-Components) and design system tools (Figma or Storybook);
• Advanced TypeScriptexpertise across JavaScript full stack, including custom type definitions, generics, conditional types, and the ability to design type-safe APIs and components;
• Experience developing complex full-stack applications with microservices and/or serverless approaches, ensuring scalability and maintainability will be a plus;
• Demonstrated experience implementing and designing RESTful or GraphQL APIsfollowing best practices;
• Experience withintegrating third-party services. Understanding of modern integration patterns;
• Good knowledge and practical application of OOP, SOLID principles, design patterns, and enterprise integration concepts (versioning strategy, naming convention strandards, etc.) in production environments;
• Following and optimizing coding standards, architecture patterns/styles, and development best practices across teams;
• Upper-intermediate Englishlevel sufficient for technical discussions, documentation writing, code reviews, and effective team collaboration in an international environment;
• Proactivity and continuous learning(demonstrated ability to research and come up with possible problem solutions, stay ahead of emerging trends, especially in AI and cloud technologies).

Will be a plus:

• Experience with developing AI-powered features using APIs (OpenAI, Claude), integrating GitHub Copilot workflows;
• Experience with AWS/Azure/GCP microservice-based architectures with Docker containers and Kubernetes/ECS orchestration, backed by IaC CI/CD pipelines;
• Experience with Serverless Framework or AWS SAM;
• Knowledge of GraphQL;
• Experience with code audit would be a big plus:Handling audit process through stages like (static analysis -> manual review -> remediation tracking) and provide deliverables like risk map, remediation plan;
• Conducting code audits for security vulnerabilities (static code analyzers like SonarQube, Snyk, dependency vulnerability scanning), performance bottlenecks, and technical debt assessment, with knowledge of industry security standards and compliance requirements.
• Knowledge of service workers, offline caching strategies and PWA best practices.

Responsibilities:

• Design and develop scalable web applications including React, TypeScript, Redux/Context API for frontend;
• Develop and maintain RESTful APIs using Node.js and NestJS;
• Implement data models with PostgreSQL or MySQL RDS;
• Ensure optimal performance with Redis caching strategies for high-traffic applications;
• Maintain consistency in code quality, documentation, and development workflows;
• Conduct comprehensive code reviews;
• Facilitate knowledge transfer sessions;
• Implement and optimize development processes using modern AI toolset;
• On demand, participate in code audits and provide recommendations for codebase improvements and risk mitigation;
• Partner closely with PM, UX/UI designers, BAs, and Solution Architects throughout project implementation.

Responsible recruiter: Karolina Skup

Softjourn is a full-cycle consulting and software development company, with expert product teams experienced in Fintech, Media & Entertainment, with a special emphasis on Ticketing. Headquartered in Silicon Valley, California, with R&D offices in Ukraine, Poland, and Brazil, Softjourn is a global software development company with over 20 years of experience.

Softjourn has been honored as a veteran-friendly business by the Veteran Hub in Ukraine. We are committed to creating a supportive environment for veterans and implementing processes that address their needs. We highly value the unique skills and perspectives that military veterans bring to our company and are dedicated to assisting their transition to the workforce.

Softjourn Inc. is an Equal Opportunity Employer. We celebrate diversity in all forms and are committed to maintaining a discrimination-free workplace that treats applicants and employees with dignity and respect. Our employment process is conducted without regard to race, color, religion, nationality or ethnic background, sex, pregnancy, sexual orientation, gender identity or expression, age, disability, protected veteran status, genetic information, or other attributes protected by state, federal, and local law.

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