Python Backend Engineer 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

2 year(s) or above

Remote Job

Yes

Telecommute

Yes

Sponsor Visa

Skills

Python, FastAPI, Docker, Kubernetes, Asyncio, Event Loops, Concurrency Patterns, WebSockets, LLMs, Agent-Based Architectures, Clear Communication, Cross-Functional Collaboration, High Ownership Mindset

Industry

Description

At Bolna, we’re building tools that change the way teams leverage Voice AI. We’re looking for a Python Backend Engieer 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 deliver user-facing features for our Voice AI platform that are scalable, fast, and production-ready. Work hands-on with customers to deeply understand their needs and design AI agents that fit real-world hiring workflows. Convert abstract ideas into tested, deployable solutions with quick iteration cycles. Collaborate with our core engineering team to evolve a distributed system handling over 10,000+ voice interactions in parallel. Required Skills: 2+ years of experience building scalable backend systems in Python, ideally with FastAPI (or similar frameworks), and deploying with Docker/Kubernetes. Strong fluency with asyncio, event loops, and concurrency patterns (multithreading, multiprocessing). Hands-on experience with WebSockets, LLMs, or agent-based architectures. High ownership mindset - you prefer building over waiting, and clarity over perfection. Clear communicator, comfortable working cross-functionally and making pragmatic decisions. 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 deliver user-facing features for the Voice AI platform that are scalable, fast, and production-ready. Collaborate with the core engineering team to evolve a distributed system handling over 10,000+ voice interactions in parallel.