Senior Front-end Engineer (React & TypeScript)

About the Position

We are seeking a Senior Front-end Engineer (React & TypeScript) to join Group107 for a client project - Bayesline, a modern portfolio risk and attribution analytics platform for institutional investors. Their GPU-accelerated system helps portfolio managers, risk teams, and quant researchers run faster, more customizable analytics on their own data, deployed inside each client’s cloud environment.

You will own the front-end alongside a small, technical founding team - building new features, improving architecture and performance, and raising the overall quality of a dense, data-heavy analytical UI. The company has just closed a funding round backed by one of the largest known investors, with long-term cooperation planned and real influence on product and architecture decisions.

Note on working hours: the schedule is flexible, but you’ll need to shift your working day slightly to maintain a daily 4–5 hour overlap with the US-based team for syncs and collaboration.

Responsibilities

• Own and improve major areas of the front-end, including the dashboard builder, report grids/charts, settings systems, and AI chat experience
• Drive performance across the application: code splitting, component memoization, virtualization, and efficient rendering for large datasets
• Strengthen the component library, testing infrastructure, and overall code quality
• Build new report types, chart visualizations, and analytical workflows as the platform expands
• Refine and polish AI-generated code with an expert eye for consistency, accessibility, and maintainability
• Collaborate directly with the founding team on product, UX, and architecture decisions
• Maintain and evolve the design system and shared component library

Requirements

• 5+ years of professional front-end development with React and TypeScript
• Deep experience building data-heavy, high-density UIs
• Strong understanding of front-end performance: virtualization, memoization, lazy loading, efficient re-renders, Web Workers
• Solid experience with state management at scale (Zustand, Redux, MobX, or similar)
• Experience with component libraries and design systems (Mantine, Ant Design, MUI, or similar)
• Comfortable working against a Python backend with auto-generated TypeScript types (no Python experience required, but you’ll read it to understand API contracts and data shapes)
• Experience with modern testing: unit tests, integration tests (MSW or similar), E2E (Playwright or Cypress), and component development (Storybook)
• Comfortable using AI tools (Claude, Cursor, etc.) in day-to-day development, with the judgment to evaluate, refactor, and improve AI-generated code
• Strong written English communication for async collaboration with a US-based team (Upper-Intermediate B2+)

SOFT SKILLS

• Independent operator able to own large areas of the codebase end-to-end
• Sharp technical judgment and ability to make architectural decisions
• Strong communication and interpersonal skills for direct collaboration with founders
• Comfortable in an async-first workflow with minimal rigid ceremonies
• Ability to mentor through code review and raise the quality bar across the team
• Bias toward shipping in small, high-quality increments

Nice to Have

• Experience building grids, charts, dashboards, or pivot tables - especially with AG Grid or AG Charts
• Experience building for fintech, portfolio analytics, risk platforms, or BI/analytics tools
• Familiarity with institutional investing concepts (portfolios, benchmarks, factors, risk decomposition)
• Hands-on experience with React 19, Vite, TanStack Query, react-grid-layout, or @dnd-kit

We Offer

• 20 vacation days (workdays)
• 7 sick days
• Personalized career growth
• Internal English classes
• Education reimbursement
• Corporate events and team buildings
• Equipment provided

About the Company

I like the company that we all work as a united and well-coordinated team. The company provides great opportunities for development and career.

Denys Bondar

PHP Developer

Hey! My name is Dmytro, I have been working as a motion designer at Group 107 for over a year. Here I like the fact that I have the freedom to be creative and really cool projects.

Dmytro Omelian

Motion Designer

Hi, my name is Anastasia and I am a Scrum-master in Group 107. In 2020, Group 107 came into my life and became my place of strength and development.

Anastasia Makosiy

Scrum Master

Hello, I am Sam. I have been working at Group 107 as a digital campaign specialist for 2 years and it is the best position ever!

Samuel Aina

SMS/Email Campaigner

My name is Nazar and I am a React developer Group 107. I have been working here for over a year. The company has very interesting and cool projects, mega-positive people.

Nazar Rudyi

Front-End Developer

I like that company cares about me as a person and about my personal growth. I like being appreciated and listened to. Everytime I feel being motivated and inspired at work.

Iurii Masliuk

Graphic Designer

I have been working at Group 107 for more than 2 years. Most of all I like the friendly atmosphere in the office and the team spirit – it is priceless.

Mykhailo Chonka

Senior Motion Designer

It is my best decision ever! I like that company combines dynamic business approach with top-notch technologies and very strong people-oriented values.

Iryna Myasnikova

Head of PMO

When I came to work, there were only about 20 of us, at the moment there are 100+ of us, and the feeling of support and friendship remains the same as in a small team.

Anna Labish

Recruiter

What I like most is the family atmosphere, interesting projects, flexible management and the opportunity to develop my professional skills every day.

Oleg Bortnyk

UI/UX Designer

From the beginning, I felt like I’m in a big family where everybody supports each other and ready to help at any time. Group 107 gives great opportunities to develop your skills.

Yuliia Bedzai

Graphic Designer

Apply Now

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