Senior Back End Developer Viseu

Senior Back End Developer
Viseu
Viseu, Viseu District, Portugal

? Senior Backend Engineer – Portugal (Full-Time)

? Remote / Portugal | ? Time zone:

Portugal and Located in Portugal | ⏰ Full-time

At Luca, we’re building the next generation of learning tools for Latin America. We create AI-powered educational products that blend smart design, engaging content, and beautiful technology—used by thousands of students, parents, and schools across the region.

We’re looking for a Senior Backend Engineer with strong experience in Type
Script, Graph
QL, and modern
- native architecture. If you care about clean systems design, scalability, and want to push the boundaries of what’s possible with AI tools like Open
AI Agent SDK—this role is for you.

? What You’ll Be Doing

You’ll work
- functionally with:

• Frontend developers to deliver seamless API and data integrations
• AI engineers to build autonomous agents and
  - driven logic
• Infrastructure teams to scale
  - driven systems on GCP
• Product leads to implement resilient and modular backend services
• Dev
  Ops and QA to maintain reliability and traceability across environments

? Your Responsibilities

Backend & API Engineering

• Build and maintain backend services in Node. Js + Type
  Script, applying clean architecture and DDD where applicable
• Design and optimize Graph
  QL APIs, using advanced auth, reusable fragments, and decoupled resolvers
• Integrate and manage Prisma ORM in
  - concurrency,
  - tenant environments

Data & Storage

• Design and optimize complex Postgre
  SQL schemas:
  
  indexes, materialized views, partitions
• Use Firebase Firestore for No
  SQL with efficient modeling, access control, and indexing
• Implement data backup, replication, and recovery strategies

Cloud Infrastructure (GCP)

• Deploy services on Cloud Run and Cloud Functions with Docker
• Design
  - driven pipelines with Pub/Sub, retries, and
  - letter topics
• Configure routing, SSL certificates, domain management, and granular bucket policies
• Implement secure communication using Secrets Manager, VPC connectors, and
  -
  - service authentication

AI Integration with Open
AI

• Build
  - based features using Open
  AI Agent SDK
• Design modular agent systems, advanced prompting strategies, and reasoning chains
• Implement embeddings, context caching, and prompt validation pipelines

? What We’re Looking For

• 5+ years of experience building modern backend systems
• Based in Portugal

Expertise in:

• Type
  Script (advanced types, decorators, composition)
• Node. Js (streams, clusters, profiling)
• Graph
  QL (federation, batching, error masking)
• Prisma (middlewares, raw queries, performance tuning)
• Postgre
  SQL (execution plans, tuning, triggers)
• Firestore and No
  SQL modeling (indexes, TTL, batch consumption)
• Pub/Sub and
  - driven architectures
• GCP (Cloud Run, Docker, routing, Secrets Manager)
• Open
  AI Agent SDK (agent composition, embeddings, prompting)
• Experience in:
  
  
• Asynchronous and decoupled system design
• CI/CD pipelines with Git
  Hub Actions, Cloud Build
• Observability using Stackdriver / Cloud Logging

? What We Offer

• Full-time, 100% remote position based in Portugal within the Mexico/Argentina time zone
• A
  - moving
  - led team, backed by top European VCs
• The chance to build core systems that shape how millions of students learn
• A culture of ownership, curiosity, and continuous learning

? About Luca

Founded in Portugal, Luca is the
- growing edtech company in Mexico — and one of the top
- stage startups in Latin America.

We’re building the AI-native education company of the future:

combining great content, intuitive software, and the power of AI to reshape how students learn.

Already serving over 20, 000 students in under 18 months, we've earned recognition from global leaders in edtech:

? GSV Cup – Top 3 Global Ed
Tech Startups

? Holon
IQ – Top 100 Lat
Am Ed
Techs

If you want to build meaningful,
- impact technology with a
- class team — join us.