Senior Software Engineer (Frontend) at Bolna

Sofia, Sofia-City, Bulgaria -

Full Time

Start Date

Immediate

Expiry Date

14 Feb, 26

Salary

0.0

Posted On

16 Nov, 25

Experience

5 year(s) or above

Remote Job

Yes

Telecommute

Yes

Sponsor Visa

Skills

React, TypeScript, Component-Driven Architecture, State Management, Async Patterns, Real-Time Data Flows, Event-Driven UIs, APIs, REST, WebSockets, Streaming APIs, Product Intuition, Ownership Mindset

Industry

Description

At Bolna, we’re building tools that change the way teams leverage Voice AI. We’re looking for a Senior Software Engineer (Frontend) to build features and expose capabilities powering our real-time voice AI platform. This is an early, high-impact role where you’ll shape the foundation of our product and directly influence its reliability, scalability, and performance. We’re a YC F25 startup - profitable, $500K+ ARR, and growing at rocket speed. Responsibilities: Architect and build beautiful, fast, and scalable user-facing features for our Voice AI console. Own the frontend stack across our AI agent builder, real-time monitoring dashboards, and customer workflows. Work closely with designers and founders to turn abstract concepts into elegant, production-ready UIs. Collaborate with backend and ML engineers to integrate real-time voice, LLM outputs, and analytics into seamless experiences. Create high-quality, maintainable React components and improve our design system over time. Set the tone for code quality, performance best practices, and frontend reliability as we scale to thousands of concurrent voice sessions. Required Skills: 5+ years of experience building modern web applications with React (or similar frameworks). Strong foundation in TypeScript, component-driven architecture, and state management. Deep understanding of async patterns, real-time data flows, and event-driven UIs. Experience consuming APIs and working closely with backend teams (REST, WebSockets, streaming APIs). Strong product intuition - you can break down ambiguous problems and ship quickly. High ownership mindset - you bias toward action and love building end-to-end. BONUS: Background in a similar role - especially within voice AI or conversational AI startups. Why Join Backed by YC, we’re on a mission to build a generational company out of India. Rocketship trajectory: We’re profitable, growing at YC speed, and handling 1M+ minutes of real conversations every month - you will have a shotgun seat in seeing these numbers multiply Founding team seat: You’ll be among the first 10 members and help shape our culture, GTM playbooks, and the very DNA of our growth story. Hard problems, real ownership: We’re orchestrating thousands of real-time Voice AI conversations in parallel. You’ll own high-stakes problems that touch engineering, customers, and revenue at once. Learn like a founder: This is not a narrow role. You’ll juggle sales, branding, hiring, and execution - the closest thing to running your own startup, with the safety net of a fast-growing team.

Responsibilities

Architect and build user-facing features for the Voice AI console while owning the frontend stack across various applications. Collaborate with designers and engineers to create seamless experiences and maintain high code quality as the platform scales.