The English-language job board for Spain
88,000+ live jobsHybrid in Barcelona·Full-time·Added over a year ago
This job was published a year ago
Full-time hours
Per the ad.
Hybrid
Office and home days — the ad has the split.
Have the right to work in Spain
SLNG doesn't mention sponsorship in the ad.
Work in English
English is required, per the ad.
Be near Barcelona for hybrid days
No relocation package mentioned.
We pay top of market → We want to serious talent in the team, and we benchmark compensation accordingly.
Equity → All full-time, permanent roles include stock options - we want everyone to share in the upside as we build.
Flexible benefits: Health insurance, gym, and more via Cobee.
L&D: Annual budget (up to €1000) for training, courses, or conferences.
Remote work support: Monthly stipend (up to €50) to cover wifi or other costs.
Great equipment: Laptop of your choice plus €500 to set up your workstation in year one, with top-ups in following years.
Time off: Additional +5 days vacation on top of the statutory minimum.
Strong React/Next.js/Tailwind.
Experience with APIs + streaming UX.
Fluency in English
Bonus: WebRTC, WebSockets.
SLNG is building the backbone for real-time speech AI, enabling developers to run voice applications anywhere in the world with local compliance and ultra-low latency.
Challenge → Today, most speech infrastructure is US-centric, unreliable, and difficult to deploy globally. SLNG is changing that by delivering a platform that is:
Local: deployed close to users and compliant with regional regulations
Fast: designed for real-time voice experiences
Open: built to integrate with the tools and workflows developers already use.
From real-time transcription to voice AI applications, SLNG is creating the Voice AI gateway that will empower the next generation of speech-powered products.
You'll build the frontends that showcase SLNG - from our developer portal to real-time apps. You'll collaborate with DevRel to build demo UIs and turn infra into clean, usable experiences.
Build the SLNG developer portal in modern frameworks (e.g. Next.js).
Create real-time transcription + TTS dashboards.
Integrate billing, compliance, and usage analytics.
Build new voice experiences for our current and potential customers
Hybrid by design → 3 days/week in the Barcelona office for collaboration and culture.
Intro call with one of the founders
Case Study
Panel conversation with members of the SLNG Team
Final discussions
Job offer
SLNG is an early-stage artificial intelligence company building infrastructure for real-time voice agents. Its platform sits between a customer's orchestrator and their speech models, providing routing, noise cancellation, transcription and text-to-speech optimization with claimed reductions of 53% in LLM cost and 39% in latency. The company promotes UNMUTE//, an open standard for describing voice agents as code, and runs compute across 15 sovereign regions with 30+ models served through one API. It holds ISO 27001 and SOC 2 Type II certifications and states HIPAA and GDPR compliance.
Our founding team comes from the core of AI and developer tooling in the USA, with experience scaling platforms trusted by the world's best builders. Meet Luke, Founder & CEO, and Ismael, Founder & CPO at SLNG.
We're bringing that San Francisco mindset to Europe with our first hub in Barcelona, and we have the support of leading international VCs and Angels who are backing the SLNG journey.
or browse Barcelona·Engineering·Full-stack·Mid-level·Hybrid·Catalonia·Artificial Intelligence
As a Forward Deployed Speech Engineer, you will embed with customer teams to ship real-world speech AI. The role offers equity, flexible benefits, and a hybrid working model in Barcelona.
As a Speech Model Performance Engineer, you will optimize and productionize speech inference at scale. You will work on TTS voices and multilingual ASR to build a real-time voice AI gateway.
Hybrid in Barcelona
€38k - €50k
🇬🇧 🇪🇸
