Staff AI Engineer - Remote Lisboa

Staff AI Engineer - Remote
Lisboa
Lisboa, Lisboa, Portugal

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About Replika

About Replika

Replika is an AI companion loved by 35M+ users around the world. We’re redefining what it means to connect with technology — emotionally, intelligently, and personally. From mobile to VR, we’re building an experience that feels less like software and more like someone who gets you.

We’ve been featured in TED Talks, Stanford and Harvard studies, the Lex Fridman podcast. All for one reason: people connect with Replika in a deeply human way.

We're scaling fast and taking on bold challenges to become the most human AI on the planet.

About The Role

We're looking for a Software Engineer with strong Python & System Architecture experience to join our AI team. You'll work closely with AI engineers, and backend developers, and Dev
Ops to bring AI solutions into production, with a focus on infrastructure, automation, and performance.

If you're someone who thrives in
- functional teams, is excited about operationalizing
- edge LLM technologies, and has a solid foundation in backend systems and Dev
Ops, we’d love to meet you.

Responsibilities

• Build, manage, and optimize backend systems and APIs supporting AI/ML workloads.
• Support and maintain robust data and ML pipelines, ensuring scalability and reliability.
• Develop Fast
  API-based microservices leveraging Python async patterns.
• Manage state and flow tracking using Redis and Mongo
  DB, optimizing performance and persistence layers.
• Integrate with LLMs (LLa
  MA, Open
  AI, Anthropic) and support vector database operations (e. g. , Pinecone).
• Implement and maintain Docker-based containerized environments for both development and production.
• Design and monitor
  - driven systems using Kafka.
• Implement structured logging (Structlog/Logfire) and observability solutions (e. g. , Datadog).
• Collaborate with the Dev
  Ops team on CI/CD pipelines using Git
  Hub Actions.
• Contribute to Quadrant integration for deployment and operational alignment.
• (Optional) Provide support for Scala-based components, if applicable.
  
  

• Minimum 5+ years of experience with Python development
• Experience with Redis (especially asyncio clients) for state tracking and flow control.
• Strong understanding of Mongo
  DB query patterns and schema design.
• Experience working with Large Language Models, including LLa
  MA (3. x preferred).
• Hands-on with LLM APIs such as Open
  AI, Anthropic, etc.
• Experience with vector databases like Pinecone, understanding semantic search and embeddings.
• Proficient with Docker and docker compose
• Experience in
  - driven systems with Kafka (producers/consumers).
• Strong grasp of CI/CD using Git
  Hub Actions.
• Familiarity with Quadrant for deployment orchestration.
• Comfortable with logging/monitoring tools such as Datadog.
• Proven experience collaborating with
  - functional stakeholders
• Experience with systems serving at scale (at least 500k+ users)
• Startup mindset: proactive, adaptive, and comfortable navigating ambiguity
  
  

• Fast
  API for building async APIs and microservices.
• Familiarity with Scala or willingness to learn it.
• Experience with Kubernetes or other orchestration tools.
• Prior work in AI/ML-focused product teams or research environments.
• Experience in leadership roles such as Team Lead, Engineering Manager, or Staff Engineer
  
  

• A chance to build a product that actually matters to millions of people
• Freedom to work remotely with a globally distributed team
• Offsites in different countries with people who actually like each other
• A trustworthy,
  - responsibility environment where your ideas really matter
  
  

Seniority level

• Seniority level

  Mid-Senior level

Employment type

• Employment type

  Full-time

Job function

• Job function

  Engineering and Information Technology

• Industries

  Software Development

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