nut.software
PL

NUT SOFTWARE / SKILLS

Sebastian Orzechowski / Staff Backend Engineer

From architecture
to working software.

I design and develop backend services, cloud infrastructure and data processing systems. I combine Python and AWS with experience in integrations, search and applications built around language models.

Let’s work together LinkedIn

Selected technologies

  • Python
  • Django
  • FastAPI
  • AWS
  • Terraform
  • Docker
  • Databases
  • Linux
  • AI / LLM

01 / AREAS OF EXPERTISE

How I can help

Backend and integrations

I build APIs, asynchronous services and integrations with external systems. My work includes background tasks, authentication and data synchronisation.

  • Python
  • Django / DRF
  • FastAPI
  • Celery
  • SQLAlchemy / SQLModel
  • REST / Protobuf

AI / LLM

I connect language models with applications and data. I develop semantic and keyword search, document processing and MCP integrations.

  • OpenAI
  • Anthropic Claude
  • DSPy
  • MCP
  • Pinecone / FAISS
  • OpenSearch

Cloud and infrastructure

I manage AWS infrastructure as code. I prepare environments, automate deployments and configure monitoring and access controls.

  • AWS
  • Terraform
  • Docker / Compose
  • Kubernetes
  • Linux
  • GitHub Actions / GitLab CI

Data and event processing

I build ETL pipelines, migrations and data streams. I work with relational and analytical databases, geospatial data and event processing.

  • PostgreSQL
  • DynamoDB / ClickHouse
  • Athena / Glue
  • Pandas / GeoPandas
  • Apache Flink
  • EventBridge / Step Functions

Architecture and system evolution

I design distributed and event-driven systems. I develop existing applications, plan migrations and break large systems into smaller services.

  • System design
  • Event-driven architecture
  • DDD
  • SOLID
  • Distributed systems

Quality and technical collaboration

I review code, support other engineers and improve software delivery practices. I use tests, CI/CD and AI tools to improve code quality.

  • Code review
  • TDD / BDD
  • CI/CD
  • Mentoring
  • Application security
React

A broader view of the product

I also have experience with JavaScript, React and Vue.js. This helps me collaborate on features spanning both backend services and user interfaces.

Communication

Polish — native. English — B2.

02 /CONTACT

BACKEND / CLOUD / DATA / AI

Let’s talk about your project.

info@nut-software.pl

Tell me about a technical challenge or a product you want to develop. We can work out where I can help.