Streaming Engineer (JavaScript)

Mayflower

is a technology company building high-load products used by millions of people worldwide. Operating at the scale of one of the world's top-50 websites, we solve complex engineering challenges and create solutions that power real-time entertainment for a global audience.

We’re hiring a Streaming Engineer (JavaScript). Unlike classic web development, our focus is on high-load, real-time video experiences. You will build and optimize the player layer, work with binary protocols, and ensure smooth playback for millions of users.

Job Responsibilities

Video & Streaming Core: Develop and maintain the video player engine, including adaptive bitrate (ABR) logic, buffer management, and low-latency streaming (WebRTC / HLS / Low-Latency DASH). Network & Data Layer: Implement and optimize binary protocol parsers for real-time media delivery. Manage DNS resolution, TLS handshake optimization, and upgrade from HTTP/1.1 to HTTP/2/3 (QUIC) to reduce TTFB and rebuffering.

Frontend Application

Design and implement new functionality for the main website using React/TypeScript, including performance optimization and enhancement of existing features. Architecture & Scale: Participate in designing scalable, fault-tolerant systems for high-load environments. Work with Micro Frontends and modularization to isolate the player from the main UI. Quality & Reliability: Write unit/integration tests for both business logic and media pipelines. Profile memory leaks (Chrome DevTools, Performance/Memory tabs) and resolve client-side lags (e.g., 10-min freeze issues due to GC or buffer overflows). Security & Integration: Identify and resolve CORS, CSP, and security vulnerabilities. Support migration to new API interfaces and maintain shared libraries (Webpack, Rollup, esbuild).

Job Requirements (You’ll thrive here if you have):

Core JS (Critical): 6+ years with JavaScript (Vanilla JS, Event Loop, Scope, Context, Prototype, SSR, Isomorphic Apps). Streaming Experience (Mandatory): - Hands-on experience with live-streaming on the frontend (WebRTC, MSE – Media Source Extensions, or EME – Encrypted Media Extensions). - Deep understanding of binary protocol parsing (ArrayBuffer, DataView, TypedArrays) and network debugging (DNS, CORS, WebSockets). - Framework & Builds: Proficiency in React/Preact, TypeScript, Redux, ES2020, Node.js, Sass. Expert-level with build systems (Webpack/Rollup + esbuild, Babel). - Networking: Solid knowledge of AJAX, WebSockets, Server-Side Events (SSE), HTTP/1.1 vs HTTP/2, and CORS security policies. - Testing & Debugging: Experience with unit testing, profiling, and debugging (client/server-side). Ability to use -- Chrome Performance & Memory tools to detect leaks. - English: Technical English (tasks and documentation are in English).

Conditions

We know that great talent deserves great conditions, so here's what you can expect when joining us:

• EU-based employment contract and a 3-year Cyprus work visa with full support for your relocation and visa processes, including assistance for your family.
• EU passport. Opportunity to obtain an EU passport after 4 years of residence.
• Full relocation package: flights to Limassol for you and your family, a company-covered apartment for the first month, and full relocation support to make your move smooth and hassle-free.
• Transparent performance reviews twice a year, with bonus opportunities and salary adjustments.
• Private medical insurance for you and your family.
• Corporate mobile plan (unlimited in Cyprus with roaming included).
• Mindfulness & well-being support, including psychological assistance with 50% coverage.
• 50% coverage of school and kindergarten fees for your children.
• Fully covered sports benefits, and also access to in-house electric scooters and bike rentals.
• Provident fund (Cyprus): a long-term savings plan co-funded by you and the Company together (available after probation) that grows throughout your time with us in Cyprus.
• Professional growth support: language courses, conferences, training programs, and coaching.
• Peer recognition program: receive and share kudos for great work.
• A fully equipped office in Limassol’s city center, with everything you need for deep work and collaboration.
• Free breakfasts and lunches in the office and an in-house coffee bar with high-quality drinks and a health bar stocked with nutritious snacks.
• A strong engineering culture: international teams, corporate events, team buildings, and hackathons — because great work happens in great communities.

Benefits are provided in accordance with the company's policies and eligibility criteria.

Recruitment process

1. HR interview (40 min);
2. Technical interview (1,5 hour);
3. Live-coding (1,5 hour)/Test-task;
4. Final interview with the team;
5. Recommendations check;
6. Job offer.