Senior Frontend Engineer (SDE4)@WebPros

Business Email · Next-Generation Webmail Client

About WebPros

• WebPros is committed to empowering businesses worldwide through cutting-edge solutions in
• web hosting, billing automation, infrastructure, server management, and online marketing. Since
• our founding in 2017, we have grown into a global leader with brands such as cPanel & WHM,
• Plesk, WHMCS, SolusVM, XOVI, SocialBee, Sitejet and Comet Backup.
• You will join the team building our next-generation Business Email product — a modern, fast,
• search-first webmail client (mail, calendar, contacts) that replaces the legacy webmail experience
• and is prepared for AI-assisted features.

Technology Stack

• Frontend: React, TypeScript (strict mode), Vite, MUI (Material UI) with a shared design-system
• theme
• State and data layer: TanStack React Query, Redux, Zod
• Email domain: JMAP (modern JSON-based mail protocol), real-time sync and push (Server-

Sent Events / WebSocket), IMAP/SMTP , CalDAV/CardDAV

AI integration (on the roadmap): Vercel AI SDK, Anthropic Claude API, OpenAI API, Model

Context Protocol (MCP)

• Backend and infrastructure context: Node.js/TypeScript with NestJS (BFF and JMAP
• gateway services), MySQL, Redis, Docker, Nx monorepo
• Architecture: NestJS BFF over the JMAP gateway, multi-region routing, event-driven flows

Key Responsibilities

• Build and deliver new frontend features for the webmail client — mail, calendar, contacts, and
• settings — with a strong focus on quality, usability, performance, and maintainability.
• Work on real-time, sync-heavy user flows, including live mailbox updates, push notifications,
• optimistic UI, and streaming responses.
• Collaborate across teams to shape solutions that fit the product architecture and support
• smooth integration.
• Break down features into clear implementation steps, lead or contribute to kickoff discussions,
• and align with business and engineering expectations.Write unit and end-to-end tests for delivered functionality; E2E quality is a standard part of
• engineering work in the team.
• Participate in code reviews and provide thoughtful feedback that improves both code quality
• and team consistency.
• Take ownership of implementation and architecture decisions, identify risks early, and
• communicate clearly with teammates and stakeholders.
• Contribute to the NestJS BFF and JMAP gateway services where needed — backend
• contribution is a welcome part of this role.

Your Qualifications

Must-have

• 6+ years of hands-on experience with React in production environments, including modern
• build tooling such as Vite.
• Strong and confident TypeScript knowledge, including deep understanding of typing,
• architecture decisions, and maintainable code design.
• Experience building modern frontend applications with clear component structure, solid state
• management, and API integration — ideally data-heavy or real-time products.
• Practical experience with testing, including unit tests and E2E tests in tools such as Playwright.
• Ability to work independently on features: understand the problem, decompose the work,
• propose an approach, and drive execution.
• Demonstrated technical leadership: mentoring peers, driving architecture decisions, and raising
• the quality bar through reviews.
• Strong collaboration skills and readiness to work in a cross-team environment with frequent
• communication.
• Upper-Intermediate English or higher for day-to-day communication in an international
• company.
• Nice to have
• Solid backend development in Node.js/TypeScript, ideally with NestJS — you will be able to
• contribute meaningfully to the BFF and JMAP gateway services, which is a strong plus for this
• role.
• Familiarity with email or sync-heavy domains: JMAP , IMAP/SMTP , CalDAV/CardDAV, or
• comparable real-time/offline-capable products.
• Experience with MUI (Material UI) and design-system/theming work.
• Experience with AI features, LLM integrations, streaming UIs, or agent-like product
• experiences.Exposure to microservices environments or event-driven systems.
• Experience building accessible interfaces (WCAG 2.1 AA).
• Experience working in fast-growing products where requirements evolve quickly.

How We Work

• Team & workflow: fast-moving product team with a strong delivery mindset.
• Schedule: flexible full-time schedule; the team usually works roughly from 10:00 to 19:00, with
• agreed core availability.
• Timezone: UTC+2.
• Collaboration & ownership: engineers are expected to be autonomous, proactive, and
• transparent in communication.
• Code review: detailed cross-review is a real part of the process, not a checkbox.
• Design collaboration: we work with designers, although some features may start with
• engineering-driven discovery and evolve later.

Additional Context

• This is a strong senior (SDE4) individual contributor role, joining an established, high-
• expectation team building the next-generation webmail client.
• Work is primarily frontend-focused, with meaningful and welcome contribution to the NestJS
• BFF and JMAP gateway services.
• You will work with modern email protocols and real-time sync, so an appetite for the email
• domain and its edge cases is a real advantage.

Q & A

• Does the job come with a probation period, and if so, how long does it last?
• Yes, there is a 3-month probation period.
• What is the expected work schedule?
• Full-time, flexible. You can work remotely, and you can also choose a hybrid mode combining
• working on-site (in the Lviv office) and remotely.
• How many vacation and sick days are provided?
• Annual paid vacation — 20 working days / 7 unconfirmed sick days / days off a year.

Social Package & Benefits

• Full medical insuranceMacBook & accessories
• English lessons
• Accountant assistance
• Minimal bureaucracy, synergy, and formalities, primarily focusing on effective communication

Hiring Process

• Screening call with a recruiter (soft skills interview) — ~20 min
• Technical interview with the CEO of Smart Choice Software + Local Tech Expert — ~60 min
• Final interview with WHMCS Founder + CEO of Smart Choice Software — ~60 min