Senior Software Engineer
Who we are
We are Fluxon, a product development team founded by ex-Googlers and startup founders. We offer full-cycle software development: from ideation and design to build and go-to-market. We partner with visionary companies, ranging from fast-growing startups to tech leaders like Google and Stripe, to turn bold ideas into products with the power to transform the world.
The role is open to candidates based in Portugal preferably in Lisbon.
About the role
As an AI Engineer at Fluxon, you’ll take the lead in designing, building and deploying AI-powered applications for our clients.
You'll be responsible for:
System Architecture: Design and implement end-to-end AI systems and their parts, including data ingestion, preprocessing, model inference, and output structuring
Generative AI Development: Build and optimize RAG (Retrieval-Augmented Generation) systems and Agentic workflows using frameworks like LangChain, LangGraph, ADK (Agent Development Kit), Genkit
Production Engineering: Deploy models to production environments (AWS/GCP/Azure) using Docker and Kubernetes, ensuring high availability and scalability
Evaluation & Monitoring: Implement feedback loops to evaluate model performance (accuracy, hallucinations, relevance) and set up monitoring for drift in production
Collaboration: Work closely with other engineers to integrate AI endpoints into the core product and with product managers to define AI capabilities
Model Optimization: Fine-tune open-source models (e.g., Llama, Mistral) for specific domain tasks and optimize them for latency and cost
You'll work with technologies including:
Languages
Python (Preferred)
Java / C++ / Scala / R / JavaScript
AI / ML
LangChain
LangGraph
Google ADK
Genkit
OpenAI API
LLM - Large Language Model
Vertex AI
Cloud & Infrastructure
Platforms: Google Cloud Platform (GCP) or Amazon Web Services (AWS)
Storage: Google Cloud Storage (GCS) or AWS S3
Orchestration: Temporal, Kubernetes
Data Stores
PostgreSQL
Firestore
MongoDB
Monitoring & Observability
GCP Cloud Monitoring Suite
Qualifications
5+ years of industry experience in software engineering roles
Strong proficiency in Python or any preferred AI programming language such as Scala, Javascript and Java
Strong understanding of Transformer architectures, embeddings, and vector similarity search
Experience integrating with LLM provider APIs (OpenAI, Anthropic, Google Vertex AI)
Hands-on experience with agent workflows like LangChain, LangGraph
Experience with Vector Databases and traditional SQL / NoSQL databases
Familiarity with cloud platforms, preferably GCP or AWS
Understanding of patterns like RAG (Retrieval-Augmented Generation), few-shot prompting, and Fine-Tuning
Solid understanding of software development practices including version control (Git) and CI/CD
Nice to have:
Experience with Google Cloud Platform (GCP) services, specifically Vertex AI, Firestore, and Cloud Functions
Knowledge of prompt engineering techniques (Chain-of-Thought, ReAct, Tree of Thoughts)
Experience building "Agentic" workflows where AI can execute tools or API calls autonomously
What we offer
Exposure to high-profile SV startups and enterprise companies
Competitive salary
Fully remote work with flexible hours
Flexible paid time off
Profit-sharing program
Healthcare
Parental leave, including adoption and fostering
Gym membership and tuition reimbursement
Hands-on career development
Apply Now
We are Fluxon, a product development team founded by ex-Googlers and startup founders. We offer full-cycle software development: from ideation and design to build and go-to-market. We partner with visionary companies, ranging from fast-growing startups to tech leaders like Google and Stripe, to turn bold ideas into products with the power to transform the world.
The role is open to candidates based in Portugal preferably in Lisbon.
About the role
As an AI Engineer at Fluxon, you’ll take the lead in designing, building and deploying AI-powered applications for our clients.
You'll be responsible for:
System Architecture: Design and implement end-to-end AI systems and their parts, including data ingestion, preprocessing, model inference, and output structuring
Generative AI Development: Build and optimize RAG (Retrieval-Augmented Generation) systems and Agentic workflows using frameworks like LangChain, LangGraph, ADK (Agent Development Kit), Genkit
Production Engineering: Deploy models to production environments (AWS/GCP/Azure) using Docker and Kubernetes, ensuring high availability and scalability
Evaluation & Monitoring: Implement feedback loops to evaluate model performance (accuracy, hallucinations, relevance) and set up monitoring for drift in production
Collaboration: Work closely with other engineers to integrate AI endpoints into the core product and with product managers to define AI capabilities
Model Optimization: Fine-tune open-source models (e.g., Llama, Mistral) for specific domain tasks and optimize them for latency and cost
You'll work with technologies including:
Languages
Python (Preferred)
Java / C++ / Scala / R / JavaScript
AI / ML
LangChain
LangGraph
Google ADK
Genkit
OpenAI API
LLM - Large Language Model
Vertex AI
Cloud & Infrastructure
Platforms: Google Cloud Platform (GCP) or Amazon Web Services (AWS)
Storage: Google Cloud Storage (GCS) or AWS S3
Orchestration: Temporal, Kubernetes
Data Stores
PostgreSQL
Firestore
MongoDB
Monitoring & Observability
GCP Cloud Monitoring Suite
Qualifications
5+ years of industry experience in software engineering roles
Strong proficiency in Python or any preferred AI programming language such as Scala, Javascript and Java
Strong understanding of Transformer architectures, embeddings, and vector similarity search
Experience integrating with LLM provider APIs (OpenAI, Anthropic, Google Vertex AI)
Hands-on experience with agent workflows like LangChain, LangGraph
Experience with Vector Databases and traditional SQL / NoSQL databases
Familiarity with cloud platforms, preferably GCP or AWS
Understanding of patterns like RAG (Retrieval-Augmented Generation), few-shot prompting, and Fine-Tuning
Solid understanding of software development practices including version control (Git) and CI/CD
Nice to have:
Experience with Google Cloud Platform (GCP) services, specifically Vertex AI, Firestore, and Cloud Functions
Knowledge of prompt engineering techniques (Chain-of-Thought, ReAct, Tree of Thoughts)
Experience building "Agentic" workflows where AI can execute tools or API calls autonomously
What we offer
Exposure to high-profile SV startups and enterprise companies
Competitive salary
Fully remote work with flexible hours
Flexible paid time off
Profit-sharing program
Healthcare
Parental leave, including adoption and fostering
Gym membership and tuition reimbursement
Hands-on career development
Apply Now