April 8, 2026
Senior Front-End Developer (FinTech Project)
Senior • Remote
Bucharest, Romania
Ready to take your front-end expertise to the next level? At Sigma Software, we’re looking for a Senior Front-End Developer with strong React.js expertise who thrives on crafting exceptional user experiences and delivering high-quality, scalable solutions.
Joining Sigma Software means becoming part of a global team that values your ideas, supports your growth, and empowers you to make an impact. We believe in combining cutting-edge technologies with a culture of collaboration and continuous improvement.
Customer
Our client has rapidly become one of Europe’s most swiftly expanding FinTech companies. They oversee all aspects of financial operations, from generating virtual cards to facilitating wire transfers and maintaining customer account balances. As a payment institution, our client provides a platform that integrates financial services into its product, offering features such as account management, card payments, bank transfers, and additional services.
Responsibilities
Design and implement large-scale software solutions and components, primarily using React.js and TypeScript
Maintain high-quality standards throughout development, testing, and deployment phases
Collaborate closely with cross-functional teams to understand requirements and deliver optimal solutions
Mentor and guide less-experienced engineers, fostering knowledge sharing and skill development
Apply clean code principles, design patterns, and best practices in all development work
Ensure system security and scalability in distributed architectures
Participate in code reviews and continuous improvement initiatives
Requirements
5+ years of experience in front-end software development
3+ years of experience with TypeScript
4+ years of experience working with React.js
Strong expertise in designing distributed and secure systems
Solid understanding of microservices architecture
Experience in designing, building, and maintaining APIs
Proficiency in building and consuming REST and/or GraphQL APIs
Experience working with AWS cloud services
Knowledge of testing best practices
Upper-Intermediate or higher English proficiency
Would be a plus
Familiarity with DevOps practices
Experience with CI/CD pipelines and automation tools
Knowledge of containerization (Docker, Kubernetes)
Exposure to financial services or payment systems
Understanding of regulatory compliance in FinTech
Personal Profile
Strong analytical and problem-solving skills
Excellent communication and team collaboration abilities
Proactive approach to learning and adopting new technologies
Leadership mindset with mentoring capabilities
Attention to detail and commitment to quality
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Warsaw, Poland
32,000 - 43,000 PLN
🏢 Summary: Senior Front End Engineer role focused on building high-performance web applications for a fast-paced financial environment using modern frontend technologies and real-time data solutions. The position involves developing scalable interfaces, collaborating with cross-functional teams, and optimizing application performance and code quality. 🗂️ Requirements: 5+ years of Front End development experience, Strong knowledge of React, Strong knowledge of Next.js, Strong knowledge of TypeScript, Experience with WebSockets, Experience with AG Grid, Experience with Jest, Experience with React Testing Library, Experience with Playwright, Familiarity with Git, Familiarity with CI/CD, Experience with AI-assisted development tools, Fluent English 📃 Skills: React, Next.js, TypeScript, WebSockets, AG, Grid, Jest, Playwright, Git, CI/CD 🏢 Description: Senior Front End Engineer We are looking for an experienced Front End Engineer to build modern, high-performance web applications used in a fast-paced financial environment. You will work closely with backend engineers and business stakeholders to deliver scalable, user-friendly solutions with a strong focus on real-time data and application performance. Responsibilities Develop and maintain web applications using React, Next.js, and TypeScript. Build reusable UI components and real-time data interfaces. Collaborate with cross-functional teams to deliver business solutions. Optimize performance and ensure code quality through testing and best practices. Requirements 5+ years of experience in Front End development. Strong knowledge of React, Next.js, and TypeScript. Experience with WebSockets, AG Grid, and modern testing frameworks (Jest, React Testing Library, Playwright). Familiarity with Git, CI/CD, and modern development practices. Experience working with AI-assisted development tools. Fluent English.