Kamil Maruta

Senior Software Engineer

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Czasław, Poland

Experience

Oct 2024 - Present
1 year 4 months

Senior Software Engineer

Ricoh Europe

  • Developed core microservices with Ruby (Rails) and Python (Django), implementing REST and GraphQL APIs for seamless, real-time data synchronization and project workflow orchestration.
  • Engineered semantic ingestion, enrichment, and advanced retrieval using LangChain, LlamaIndex, and OpenAI API integrations, allowing teams to unlock actionable knowledge from vast data sets.
  • Designed and optimized vector search capabilities with FAISS and Chroma, achieving a 34% reduction in average response time for complex queries.
  • Built interactive, modular front-end experiences in React and TypeScript, powering dashboards, analytics, and user-driven project management features.
  • Modeled and tuned PostgreSQL schemas for partitioning, indexing, and robust transactional integrity to support high-volume, multi-tenant analytic workloads.
  • Automated secure deployments using Docker and AWS ECS across all microservices, enabling blue/green releases and rapid scaling with zero downtime.
  • Established end-to-end CI/CD pipelines in GitHub Actions, integrating automated test suites (RSpec, Pytest, Jest, Cypress) and static code analysis for every release.
  • Managed AWS provisioning, IAM, and network security with Terraform, improving cost efficiency and streamlining compliance audits.
  • Implemented authentication/authorization flows using JWT, OAuth2, and AWS Secrets Manager for robust, secure data access.
  • Enhanced observability with CloudWatch, Prometheus, and distributed tracing, resulting in a 27% reduction in mean time to recovery.
  • Mentored engineering teams in Rails, Django, and AWS native best practices, boosting development velocity and code reliability.
  • Authored and maintained comprehensive Swagger/OpenAPI specifications, accelerating partner and internal integrations.
  • Drove cloud cost optimizations, reducing monthly AWS spend by 26% through auto-scaling, resource lifecycle policies, and rightsizing.
Jun 2020 - Sep 2024
4 years 4 months

Full Stack Engineer

Thoughtworks

  • Built and maintained microservices and APIs in Ruby (Rails) and Python (Django), supporting analytics, ETL, and workflow automation.
  • Developed rich, reactive UIs using React, Redux, and TypeScript to enhance clinical efficiency and data transparency.
  • Designed secure, high-performance PostgreSQL schemas and complex queries for HIPAA-compliant patient data management.
  • Automated deployments via Docker and AWS ECS, achieving high deployment velocity and minimal production risk.
  • Integrated OAuth2 and RBAC, encrypted storage, and AWS IAM to meet and exceed healthcare data compliance requirements.
  • Automated unit and end-to-end test workflows in RSpec, Pytest, and Cypress, maintaining high code quality and rapid feedback cycles.
  • Optimized ETL, background job, and real-time reporting pipelines using Celery and Sidekiq for cross-framework operability.
  • Led code reviews, technical workshops, and DevOps adoption, increasing team efficiency and deployment rates.
  • Implemented infrastructure monitoring, alerting, and logging using AWS CloudWatch and custom dashboards.
Jul 2016 - May 2020
3 years 11 months

Software Engineer

Soltech

  • Developed modular models and business logic with Ruby (Rails) and Python (Django) supporting user management, analytics, and content delivery.
  • Built and enhanced React-based dashboards for seamless end-user interaction and administrative oversight.
  • Designed advanced, compliant relational schemas in PostgreSQL to support high transaction volumes.
  • Automated deployments and CI pipelines using Docker, AWS ECS, and Jenkins for robust, repeatable releases.
  • Applied JWT-based authentication, rigorous testing (RSpec, Minitest, Jest), and comprehensive code reviews.
  • Established documentation, code review best practices, and process guides to facilitate team expansion.
  • Enhanced reporting and notifications via email, Slack, and custom messaging integrations.
Nov 2015 - Jun 2016
8 months

Junior Software Developer

Current Health

  • Contributed to backend API development using Ruby (Rails) and Python, implementing business logic for payments and user insights.
  • Developed front-end React components for admin and analytics reporting.
  • Supported PostgreSQL schema design, performance tasks, and backup automation.
  • Automated containerization and AWS cloud deployments using Docker and CloudFormation.
  • Built unit, integration, and e2e test suites with RSpec and Pytest to ensure product quality.
  • Enhanced process documentation and delivered onboarding sessions for new team members.

Summary

Senior Software Engineer with over 11 years of experience architecting, developing, and optimizing cloud-native solutions using Ruby, Python, React, and AWS. Expert in designing scalable microservices, secure APIs, and responsive front-end applications, driving enterprise-grade projects from conception to reliable production.

Skills

  • Backend: Ruby (Rails), Python (Django), Restful Apis, Microservices, Asynchronous Processing, Graphql
  • Frontend: React, Typescript, Redux, Javascript (Es6+), Html5, Scss
  • Databases: Postgresql, Mongodb, Redis
  • Cloud & Devops: Aws (Ec2, S3, Lambda, Rds, Ecs, Iam), Docker, Kubernetes, Terraform, Ci/cd (Github Actions, Gitlab Ci)
  • Testing: Rspec, Minitest, Pytest, Django Test, Jest, Cypress, Selenium, Postman
  • Ai & Data: Llamaindex, Langchain, Openai Api, Faiss, Chroma
  • Tools: Git, Jira, Confluence, Visual Studio Code, Intellij Idea, Swagger/openapi, Sonarqube, Figma

Languages

Polish
Native
English
Advanced

Education

Oct 2011 - Jun 2015

University of Oxford

Bachelor of Science, Computer Science · Computer Science · Oxford, United Kingdom

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