Jobs JavaScript / Front-End

DARLY SOLUTIONS is an international IT company specializing in delivering innovative solutions across Fintech, MedTech, SaaS, etc.
We are looking for a specialist for a short-term project engagement.

Responsibilities

• Develop and finalize the frontend of the product MVP.
• Build and maintain frontend components using Qwik or Aspire React.
• Integrate the frontend with the existing .NET backend.
• Design and implement a Backend for Frontend layer using .NET.
• Integrate third-party services, including Stripe and other external providers.
• Work with high-fidelity wireframes, UI libraries, and product tickets in Figma and GitHub.
• Participate in two-week development sprints and deliver tasks according to agreed timelines.
• Collaborate on clarifying and refining product requirements as needed.
   

Requirements

• At least 3 years of experience in Front-End Development.
• Strong experience with modern frontend development and component-based architecture.
• Experience with Qwik or React.
• Strong knowledge of .NET and experience building backend services or APIs.
• Experience designing and implementing a Backend for Frontend architecture.
• Experience integrating third-party APIs and services, including payment providers such as Stripe.
• Upper-Intermediate (B2) English level, with confident spoken communication skills.
• Understanding of frontend-backend communication, API integration, and data handling.
• Ability to work independently, take ownership of frontend development, and drive tasks to completion.

We’re looking for a senior-level React engineer to own critical frontend experiences, collaborate closely with product/design, and help us scale BridgeWise to millions of users.

What you’ll do

• Design, build, and ship high-performance, responsive web UIs
• Partner with product managers, designers, and analysts to translate user needs into elegant product experiences
• Plan and execute short- and long-term roadmaps balancing user impact, technical quality, and delivery speed

• Raise the bar through code reviews, mentoring, and improvements to our tooling and processes

   

Must-have expertise

• Next.js (our web app is built with Next.js)
• Monorepos using Yarn Workspaces or Nx
• Tailwind CSS (our primary design system)
   

Technical requirements

• 5+ years of professional software development experience
• 5+ years with React and its ecosystem (e.g., Redux, React Router)
• Strong proficiency in JavaScript (ES6/ES7) and TypeScript
• Deep knowledge of HTML/CSS, responsive design, and accessibility (a11y) best practices
• Hands-on with modern build tooling and package managers (Vite, esbuild, Yarn)
• Experience with server-side rendering and Next.js, plus working knowledge of Node.js
• Comfortable with Git workflows and agile methodologies
• 3+ years working with major cloud providers (AWS/GCP/Azure)
• Storybook
   

Nice to have

• Experience with monorepo release management and internal package versioning
• Familiarity with performance profiling, Web Vitals, and SEO in Next.js
• E2E testing (Playwright/Cypress) and CI/CD pipelines
• Experience in fintech or data-heavy, real-time UIs

About the project

We are building a new industrial web platform designed to run both as an Azure-hosted SaaS solution and as an air-gapped on-premises installation from a shared codebase.

The platform uses modern .NET technologies, with Avalonia UI powering the user interface across browser-based WebAssembly and desktop applications.

You will help build the core UI framework, creating a reusable, modular, and high-performance interface for industrial dashboards and data-intensive applications.

The stack is .NET 10, ASP.NET Core, PostgreSQL/TimescaleDB, Keycloak, Docker and Kubernetes, with all UI in Avalonia.

We are looking for a Middle/Senior Frontend Developer with strong C#/.NET and Avalonia UI experience to build the user interface of a new industrial web platform running in the browser through WebAssembly and sharing code with desktop applications.

This is a UI-focused engineering role, not a traditional JavaScript frontend position. We are looking for someone experienced in building complex interfaces, reusable components, and UI architecture using Avalonia, or strong WPF/XAML expertise combined with hands-on Avalonia experience.

Requirements

• 5+ years of commercial experience with C# and .NET, including modern .NET versions.
• Production experience with Avalonia UI, or strong WPF/XAML experience combined with hands-on Avalonia development.
• Solid understanding of MVVM, dependency injection, and asynchronous programming.
• Experience building custom controls, styles, themes, and data-intensive interfaces such as grids, charts, and dashboards.
• Ability to write maintainable, testable code and collaborate through Git-based code review workflows.
• Availability to work remotely from within the EU and overlap with the US East Coast working hours from 08:00 to 13:00 ET.

Nice to have

• Experience migrating desktop applications from WPF or WinForms to Avalonia.
• Hands-on experience with Avalonia UI running in the browser through WebAssembly and understanding of its limitations.
• Familiarity with LiveCharts2, ScottPlot, OxyPlot, or commercial UI control libraries.
• Experience with plug-in systems or modular UI architectures.
• Unit testing of view models and automated testing practices.
• Knowledge of OIDC authentication, Keycloak, notifications, and file uploads.
• Experience optimizing WebAssembly applications through trimming, AOT compilation, or lazy loading.
• Familiarity with accessibility standards (WCAG) and localization.
• Experience building industrial, IIoT, manufacturing, or other data-intensive dashboard applications.
• Basic knowledge of ASP.NET Core and REST/OpenAPI.

Responsibilities
• Build the Avalonia UI shell: navigation, layouts, user preferences, and responsive and touch-friendly design.
• Create a reusable component library and themes (light, dark, high-contrast), with customer branding kept separate from themes.
• Implement UI extension points so plug-ins can add pages, dashboards and settings, with visibility driven by roles and licenses.
• Test and help select charting and control libraries for Avalonia WASM.
• Set up the localization architecture and port existing WPF screens to Avalonia.
• Optimize WASM load time and performance across the four target browsers.
• Write unit tests, take part in code reviews, and document UI decisions.
 

We are extending our Integrity teams and seeking for several Senior Frontend Engineers with strong expertise in modern frontend technologies such as web components, React, and microfrontends. This role is ideal for engineers passionate about designing and delivering intuitive, high-performing, and reliable user interfaces that support our award-winning educational platform.

As a core contributor to our product development team, you will play a critical role in shaping the user experience of both existing and new applications. You will collaborate closely with backend engineers, designers, and product managers to create scalable and engaging solutions that meet the needs of educators and students worldwide.

Responsibilities: 

• Component Development:
  • Design, develop, and maintain highly efficient, reusable, and scalable web components using Stencil.js, TypeScript, and React.
  • Build modular and reusable UI components to ensure consistency and maintainability across projects.
• Architecture & Best Practices:
  • Establish and enforce best practices for component design, including accessibility (WCAG compliance), performance optimization, and responsive design.
  • Collaborate with the team to define the architecture of the design system or reusable component library.
• Integration & Collaboration:
  • Ensure seamless integration of web components into various applications, particularly within React projects.
  • Work closely with backend engineers to design APIs that enable efficient data flow and interaction with frontend components.
• Code Quality & Standards:
  • Write clean, maintainable, and well-documented code, adhering to modern standards and practices.
  • Perform regular code reviews and ensure adherence to best practices and coding standards.
• Testing & Debugging:
  • Create robust unit and integration tests for web components.
  • Debug and resolve performance bottlenecks and other frontend issues.
• Collaboration & Mentorship:
  • Work closely with designers and product managers to understand requirements and provide technical insights during the planning phase.
  • Mentor junior frontend engineers, sharing knowledge on web components, Stencil.js, TypeScript, and React.
• Performance Optimization:
  • Continuously improve the performance of web components, ensuring compatibility with various browsers and platforms.
  • Optimize assets and rendering pipelines for faster load times and better user experience.
• Documentation & Support:
  • Create comprehensive documentation for the developed reusable components, including usage guidelines and examples.
  • Provide technical support to teams integrating the components into their projects.
• Continuous Learning:
  • Stay up-to-date with emerging frontend technologies, particularly in web components and frameworks like Stencil.js and React.
  • Proactively suggest improvements to existing tooling, frameworks, or processes to enhance team efficiency and product quality.
• Cross-functional Collaboration:
  • Collaborate with DevOps to streamline CI/CD processes for frontend builds and deployments.
  • Ensure smooth handoff of frontend deliverables to QA and collaborate on addressing issues during testing.

Numerical Technologies is a leading provider of custom software solutions and services specializing in risk, limits, and regulatory capital. Right now, we are looking for a Front-end Developer to join our team.
 
What will you be doing?
As part of the team, you will contribute to the development of this internal product, focusing on building and improving user-facing features. You will maintain and refactor existing components, ensuring a smooth, responsive, and accessible user experience. Your responsibilities will include writing clean, scalable, and maintainable front-end code, integrating with internal and third-party APIs, and collaborating closely with designers and the product team. You will also take part in code reviews, testing, and continuous improvements to the front-end architecture.
 
What are we looking for?
 

• 5+ years experience in a Front-end Developer role
• Strong experience with React and modern front-end development practices
• Proficiency in TypeScript and component-based development
• Experience with Vite or similar modern build tools
• Solid understanding of React Router v6 for client-side routing
• Practical experience with design systems and component libraries
• Good collaboration skills and experience working closely with designers and product teams
• Upper-Intermediate level of English or higher

 
We offer:
 

• Competitive compensation depending on experience and skills
• Regular assessments and salary reviews
• Paid personal days
• Health insurance
• Mental health support program
• English/Polish/Portuguese language classes
• Flexible working schedule

Key Requirements:

- At least 4 years experience with Magento 2 frontend

- Good knowledge of HTML/CSS/JavaScript/AlpineJS

- At least B2 English level

- HYVA & HYVA Checkout experience is a MUST

Key Responsibilities:

- Creation of Magento 2 themes

- Implementation of responsive design for different web browsers and platforms

- Work with custom JS functionality, adjustment of the frontend functionality of 3rd-party Magento modules

- Supporting existing solutions

- Take part in the development of our own tools and frameworks

- Project deployment and basic testing

We offer:

- Become a part of rapidly growing Ecommerce Agency

- NO russian clients, NO russian colleagues!

- Remote work

- Paid time-off

- Flexible schedule

- Ability for a constant financial and professional growth

- Free of charge Speaking Club

Responsibilities

• Develop and maintain modern web applications and user interfaces;
• Turn UI/UX designs into responsive and interactive frontend experiences;
• Build reusable, scalable, and well-structured components;
• Connect frontend applications with APIs and backend services;
• Improve application performance, usability, and reliability;
• Identify and fix bugs and frontend-related technical issues;
• Ensure a consistent experience across different browsers and devices;
• Work closely with backend developers, designers, and product managers;
• Participate in code reviews and contribute to technical decisions;
• Continuously improve existing features and frontend architecture.

Requirements

• 2+ years of professional experience in frontend development;
• Professional experience with one or more frontend technologies such as JavaScript, TypeScript, React, Vue.js, Angular, Svelte, HTML, CSS, or similar technologies;
• Strong understanding of modern web development principles;
• Experience building responsive and user-friendly interfaces;
• Experience working with REST APIs and backend integrations;
• Good understanding of Git and version control;
• Understanding of frontend performance optimization;
• Ability to write clean, reusable, and maintainable code;
• Strong problem-solving and analytical skills;
• Good communication and teamwork skills.

Nice to Have

• Experience with React / Next.js, Vue / Nuxt.js, Angular, or similar frameworks;
• Experience with TypeScript;
• Experience with state management libraries;
• Experience with automated testing;
• Knowledge of UI/UX principles;
• Experience with Docker and CI/CD;
• Experience working with cloud-based applications;
• Previous experience working on SaaS products;
• Experience in an Agile/Scrum environment.

Senior Frontend Engineer

About Us
Peratera is a UK-based fintech company, founded in 2022 and authorised by the FCA as an Electronic Money Institution.

We are building a modern, all-in-one payment platform that enables businesses to manage global payments and financial operations seamlessly.

Our solution allows companies to open multi-currency accounts, send and receive payments worldwide, and manage cross-border transactions from a single platform.

Our mission is to simplify global finance and remove friction from international business operations.

Your Mission 

As a Senior Frontend Engineer, you will be part of the team building and evolving the user-facing applications behind our financial platform.

This is a hands-on engineering role where you will develop new functionality, improve existing solutions, and contribute to frontend architecture and technical decisions. You will work closely with Backend Engineers and Product to deliver reliable and intuitive experiences for users managing financial operations.

Your Tech Environment

You will work across a modern frontend stack alongside existing platform components:

• Frontend: Angular, React, TypeScript, JavaScript, Tailwind CSS, HTML, CSS
• Existing Components: jQuery 3.7.0, Materialize, funnelEvents.js, bankElements.js
• Backend: PHP 8.3.26, CodeIgniter 3.1.8
• Data & Infrastructure: MySQL 8.0, Redis 7.4

What You’ll Do 

• Own frontend development from technical design through implementation, testing, and production delivery
• Build and evolve user-facing applications for payments, accounts, transactions, and other financial workflows
• Develop reusable UI components and features using Angular, React, TypeScript, and Tailwind CSS
• Translate product and business requirements into clear technical solutions and pragmatic frontend implementations
• Contribute to frontend architecture, technical decisions, and the evolution of shared frontend patterns and standards
• Integrate frontend applications with REST APIs and backend services, working closely with Backend Engineers on API contracts and end-to-end functionality
• Work with existing production codebases, improving legacy components while introducing modern frontend solutions where appropriate
• Identify and address frontend issues related to performance, reliability, security, and user experience
• Write well-tested code and participate in code reviews, debugging, technical discussions, and knowledge sharing
• Collaborate with Product, UX/UI, QA, and DevOps to deliver features from initial requirements through production

What We’re Looking For

• 5+ years of professional experience in frontend engineering
• Strong hands-on experience with modern Angular and React, including Angular 16+ and React 17+
• Proficiency in TypeScript and JavaScript, with a solid understanding of component-based frontend architecture
• Experience building complex interfaces and reusable UI components with Angular, React, and Tailwind CSS
• Practical experience with state management and reactive programming using NgRx, Redux, Zustand, RxJS, or similar technologies
• Experience integrating frontend applications with REST APIs, authentication, and authorization flows, including OAuth2, OIDC, and JWT
• Experience with unit and integration testing, debugging, performance optimisation, Git, CI/CD, and code review practices
• Ability to work confidently with existing production codebases, understand unfamiliar systems, and improve them without unnecessary rewrites
• Ability to take ownership of frontend solutions, make sound technical decisions, and work effectively with Backend Engineers, Product, QA, and UX/UI
• Strong attention to code quality, security, performance, and user experience

Nice to Have

• Background in fintech, banking, payments, or other regulated environments
• Hands-on work with back-office systems, admin portals, dashboards, or operational tools
• Understanding of frontend security principles, including XSS/CSRF prevention and secure handling of sensitive data
• Familiarity with PHP, CodeIgniter, micro-frontends, modular frontend architecture, or design systems
  
   

What You’ll Get

• Competitive, market-aligned compensation - discussed openly at first interview
• Direct impact on architecture and strategic platform decisions from day one
• A real fintech platform running at production scale - not a demo environment
• Exposure to modern cloud-native, AI-assisted, and Open Banking systems
• Fully remote setup with flexible hours and an international, highly skilled team

Sounds like a match? Send us your CV - we’re excited to get to know you.

We are building a revolutionary AI-based image and video processing platform and are looking for an Integrations Engineer to help expand our customer base through your technical expertise. We are open to candidates who can contribute significantly to developing our solutions and improving the customer experience.

​

Role Overview
​The responsibilities of a Solutions Engineer include sharing expertise on the product and its integration—specifically focusing on front-end understanding and a strong overall grasp of web technologies. You will use your analytical and interpersonal skills to guide our clients and maximize the value they gain from using our technology.
 

​The ideal candidate should have excellent communication and interpersonal skills, as well as the ability to meet KPIs and deadlines, demonstrating strong analytical abilities.

​Key Responsibilities

• Be the Product Expert: Act as the product expert and trusted advisor that clients can turn to for guidance on maximizing value from our technology.
• Expand Technical Expertise: Gain experience in front-end and back-end development, web optimization, performance best practices, AI/ML, cloud computing, media compression, and CDN.
• Support & Troubleshoot: Support customers’ technical queries, solve integration issues, and demonstrate the possibilities of the technology.
• Onboard Customers: Manage the technical onboarding of new customers and translate their desired outcomes into an implementation plan that will provide value.
• Define Requirements: Define new technical requirements for integration and prioritize project timelines.
• Cross-functional Collaboration: Ensure all customer requests and issues are handled promptly, working in collaboration with relevant teams including Customer Success, R&D, Sales, and Marketing.
• Quality Assurance: Utilize QA practices to ensure high-quality integrations

Requirements

• Language Proficiency: Strictly C1-C2 English level required.

  Candidates at an Upper-Intermediate (B1-B2) level will not be considered. Exceptional written and verbal presentation skills are a must.

• Working Hours: High flexibility and ability to operate within the US time zone.
   

​Technical Skills:

• 5+ years of experience as a Solutions Engineer, Front-End professional, or in QA within a global, fast-paced environment.
• Experience with Full-Stack technologies (e.g.,Node.js, React, Angular) or QA skills (e.g., automated testing, performance testing).
• ​Hands-on experience with web and cloud technologies.
• Experience with basic debugging/QA tools (e.g., Chrome Dev Tools).
• Problem Solving: Ability to effectively assess and quickly resolve technical issues while working with both technical and non-technical teams. High-level technical, project, and problem-solving skills.

• Mindset: Strong critical thinking and analytical skills with an entrepreneurial, proactive, and result-oriented mindset. Highly motivated, a fast learner, and open-minded.

   

Nice to Have​

• BS, BA, BEng degree or equivalent in Computer Science or a related field.
• ​Experience with Full-Stack technologies (e.g., Node.js, React, Angular) or automated/performance QA testing skills.
• ​Relevant certifications, courses, or experience in adjacent technologies.

We OFFER:

• ​A fast-paced, highly professional, international team environment with a flat structure and rapid decision-making.
• ​Competitive compensation packages commensurate with your background and product portfolio.
• ​Flexible, remote-first workflow optimized for seamless global alignment.
• Medical Insurance in Ukraine and a Multisport program in Poland.
• Offices in Ukraine (Kyiv, Kharkiv) and Poland (Wroclaw) or Remote.
• Paid vacation, sick leave, and official holidays.
• Legal & Accounting services.
• The company provides all necessary equipment.
• English classes and Education reimbursement.

Why this role exists:

The purpose of this role is to design and implement scalable software solutions, ensuring high-quality delivery within established timelines. The role focuses on solving complex technical challenges, improving engineering practices, and contributing to software reliability and performance. A Senior Developer mentors peers, shares technical expertise, and collaborates with cross-functional teams to deliver solutions that meet business requirements.

What you’ll drive:

Architecture and development

• Designing and implementing scalable and efficient software architectures.
• Writing, testing, and debugging complex code for new and existing software applications.
• Delivering code to production in a timely manner according to business expectations.

Leadership and collaboration

• Providing guidance and mentoring to junior engineers and team members.
• Conducting thorough code reviews to ensure code quality, security, and best practices.
• Managing software development projects, ensuring timely delivery and quality.
• Collaborating with cross-functional teams to design and align technical solutions that meet business objectives
• Communicating effectively with stakeholders on technical concepts.

Engineering processes and quality assurance

• Creating and maintaining comprehensive technical documentation for software development and system design.
• Creating and maintaining comprehensive technical documentation for software development and system design.
• Researching and implementing new technologies and methodologies to improve software performance and development processes.
• Identifying and resolving complex software issues and technical challenges.
• Developing and enforcing testing protocols to ensure software reliability and performance.
• Driving continuous improvement in software development practices and processes.

What makes you a GR8 fit:

Must-have

• Minimum of 5 years of experience in a similar senior engineering role;
• Deep knowledge of JavaScript, TypeScript, React, HTML, CSS, state management libraries, build tools, package managers, and web testing frameworks;
• Experience with microfrontend architectures and Module Federation patterns (Webpack Module Federation, dynamic remote loading, shared dependency management);
• Ability to analyze code, debug complex issues, optimize performance, and develop proofs of concept (PoCs);
• Understanding of web performance metrics and browser performance optimization, including Core Web Vitals (LCP, INP, CLS), FCP, TTFB, TBT, Speed Index, Time to Interactive (TTI), bundle size, and JavaScript parsing and execution performance;
• Understanding of browser internals, SPAs and static websites, client-server architecture, REST APIs, SSR, web security, and UI/UX patterns;
• Effective communication skills with both technical and non-technical audiences;
• Upper-Intermediate English level.

We are looking for a senior frontend engineer to build high-performance 3D scientific visualization directly in the browser.

You will work at the intersection of frontend engineering, GPU programming, and large-scale data visualization. The core challenge is making complex 3D and time-varying datasets interactive in the browser without requiring users to download or fully load them first.

What you will do

• Build browser-based 3D visualization using TypeScript and WebGPU.
• Render large meshes, point clouds, volumetric fields, and other scientific data.
• Integrate visualization with asynchronous and random-access data streaming.
• Design efficient GPU buffer management, caching, and incremental scene updates.
• Build React-based UI around the visualization experience.
• Profile and optimize CPU, GPU, memory, and network performance.

• Work closely with systems, backend, and GPU engineers on end-to-end data delivery.

   

What we are looking for

• Strong production experience with TypeScript / JavaScript.
• Practical experience with WebGPU, or deep WebGL experience with an interest in moving to WebGPU.
• Strong understanding of performance optimization in browser applications.
• Experience with React or another modern frontend framework.
• Good knowledge of vector math, coordinate systems, cameras, transforms, and spatial data structures.

Nice to have

• Experience with Three.js, Babylon.js, vtk.js, React Three Fiber, or custom rendering engines.
• WGSL, GLSL, CUDA, Vulkan, DirectX, or Metal experience.
• Scientific visualization experience with ParaView, VTK, VisIt, or similar tools.
• Volume rendering, isosurfaces, unstructured meshes, point clouds, particles, or large geometry.
• LOD systems, spatial partitioning, octrees, BVHs, or GPU-driven rendering.
• Background in CAD, simulation, geospatial, medical imaging, games, or visualization software.