Looks like you have JavaScript disabled. For the full Twine experience, you will need to re-enable it.

I'm Marcin Olszok, a seasoned software engineer with over eight years of experience designing and deploying scalable, distributed systems across healthcare, logistics, and financial platforms. I specialize in architecting microservices, building real-time data pipelines, and integrating AI components like LLMs and vector search to unlock meaningful insights. I thrive on practical problem-solving, performance tuning, and delivering robust APIs that power complex, data-heavy platforms. I'm passionate about modernizing health care data into actionable, patient-centered solutions and enjoy mentoring teammates to reach higher levels of craftsmanship.…I'm Marcin Olszok, a seasoned software engineer with over eight years of experience designing and deploying scalable, distributed systems across healthcare, logistics, and financial platforms. I specialize in architecting microservices, building real-time data pipelines, and integrating AI components like LLMs and vector search to unlock meaningful insights. I thrive on practical problem-solving, performance tuning, and delivering robust APIs that power complex, data-heavy platforms. I'm passionate about modernizing health care data into actionable, patient-centered solutions and enjoy mentoring teammates to reach higher levels of craftsmanship.

Marcin Olszok

Full Stack Developer, AI Engineer, AI Prompt Engineer, +5





I'm Marcin Olszok, a seasoned software engineer with over eight years of experience designing and deploying scalable, distributed systems across healthcare, logistics, and financial platforms. I specialize in architecting microservices, building real-time data pipelines, and integrating AI components like LLMs and vector search to unlock meaningful insights. I thrive on practical problem-solving, performance tuning, and delivering robust APIs that power complex, data-heavy platforms. I'm passionate about modernizing health care data into actionable, patient-centered solutions and enjoy mentoring teammates to reach higher levels of craftsmanship.…I'm Marcin Olszok, a seasoned software engineer with over eight years of experience designing and deploying scalable, distributed systems across healthcare, logistics, and financial platforms. I specialize in architecting microservices, building real-time data pipelines, and integrating AI components like LLMs and vector search to unlock meaningful insights. I thrive on practical problem-solving, performance tuning, and delivering robust APIs that power complex, data-heavy platforms. I'm passionate about modernizing health care data into actionable, patient-centered solutions and enjoy mentoring teammates to reach higher levels of craftsmanship.

Available to hire

I’m Marcin Olszok, a seasoned software engineer with over eight years of experience designing and deploying scalable, distributed systems across healthcare, logistics, and financial platforms. I specialize in architecting microservices, building real-time data pipelines, and integrating AI components like LLMs and vector search to unlock meaningful insights.

I thrive on practical problem-solving, performance tuning, and delivering robust APIs that power complex, data-heavy platforms. I’m passionate about modernizing health care data into actionable, patient-centered solutions and enjoy mentoring teammates to reach higher levels of craftsmanship.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Language

Polish

Fluent

English

Advanced

Work Experience

Senior Software Engineer at Sopra Steria

June 1, 2025 - September 3, 2025

Led the development of core backend services on AWS to support an LLM-powered patient insights platform. Integrated FastAPI microservices with a Postgres-backed data model focusing on longitudinal medical records and treatments. Designed ingestion pipelines converting unstructured PDFs and HL7 payloads to FHIR-compliant objects using Python-based parsing and validation. Integrated OpenAI LLMs and LangChain to generate contextualized symptom comparisons, physician note analysis, and research recommendations for rare disease patients. Built autoscaling backend infrastructure on ECS Fargate with load-based provisioning and fault recovery. Integrated Pinecone for vectorized search across thousands of patient cases using cosine similarity and LLM-augmented RAG pipelines for patient-trial matching. Worked with Kubernetes and Terraform for reproducible environments enabling seamless QA-to-production transitions. Designed role-based access control with audit logging and field-level redaction f

Senior Software Engineer at Luxdone

August 1, 2024 - September 3, 2025

Built AI-assisted logistics analytics platform using React frontend and Python (FastAPI) backend to analyze shipment data, suggest routing optimizations, and streamline exception approvals across international logistics networks. Engineered backend pipelines in Python to ingest EDI feeds and real-time telemetry from third-party carriers, transforming raw logistics data into structured formats for downstream AI processing. Developed AI modules interfacing with OpenAI APIs to provide natural language summaries of delivery anomalies, SLA violations, and customs clearance delays. Created a React-based control center dashboard displaying current shipment statuses, risk scores, and AI recommendations, fully synchronized using Redux Toolkit and persistent state across tabs. Implemented authentication and role-based access controls using OAuth 2 and JWT in FastAPI, allowing secure access across logistics operators, freight brokers, and internal operations teams. Integrated time-series metric v

Full Stack Engineer at TinK

July 1, 2022 - September 3, 2025

Built and maintained customer onboarding workflows using React UI and Node.js backend orchestration, enabling small business owners to submit financial documents, verify identity, and receive lending decisions. Designed reusable, form-heavy React components with field validation, autosave logic, and conditional rendering tied to dynamic backend schemas, drastically reducing support tickets from broken user submissions. Implemented backend loan scoring logic using rule-based filters and cash flow analysis models written in TypeScript, allowing underwriters to tweak risk factors without requiring redeployment. Integrated e-signature workflows using DocuSign APIs on both backend (Node) and frontend (React modals and status indicators), ensuring traceable signature capture for all agreement flows. Built dashboard for internal finance teams with React Table allowing granular filtering, audit logs, and real-time status updates of application stages wired directly to PostgreSQL views. Used Re

Full Stack Engineer at Altabel Group

September 1, 2019 - September 3, 2025

Developed software solutions during early career stages, likely full stack given later roles but no detailed description provided in the source.

Senior Software Engineer at Sopra Steria

June 1, 2025 - September 3, 2025

Developed core backend on AWS to support LLM-powered patient insights platform, integrating FastAPI microservices with a Postgres-backend focused on longitudinal medical records and treatments. Designed ingestion pipelines for large sets of patient-uploaded documents, converting unstructured PDFs and HL7 payloads into normalized FHIR-compatible objects using Python parsing and validation layers. Led integration of OpenAI LLMs and LangChain-based chains to generate contextualized symptom comparisons, physician note analysis, and research study recommendations for rare disease patients. Built auto-scaling backend infrastructure on ECS Fargate with load-based provisioning and fault recovery. Integrated Pinecone for vectorized search across thousands of patient cases, leveraging cosine similarity and LLM-augmented RAG pipelines to match patients to clinical trials and community advice. Worked with Kubernetes and Terraform for reproducible environments, enabling seamless QA-to-prod transiti

Senior Software Engineer at Luxdone

August 1, 2024 - September 3, 2025

Built an AI-assisted logistics analytics platform using React frontend and Python (FastAPI) backend to analyze shipment data, suggest routing optimizations, and streamline exception approvals across international logistics networks. Engineered backend pipelines in Python to ingest EDI feeds and real-time telemetry from third-party carriers, transforming raw logistics data into structured formats for downstream AI processing. Developed AI modules interfacing with OpenAI APIs, enabling natural language summaries of delivery anomalies, SLA violations, and customs clearance delays. Created a React-based control center dashboard displaying current shipment statuses, risk scores, and AI recommendations, synchronized using Redux Toolkit with persistent state across tabs. Implemented authentication and role-based access controls using OAuth 2 and JWT in FastAPI, allowing secure access across logistics operators, freight brokers, and internal ops teams. Integrated time-series metrics visualizat

Tink Full Stack Engineer at Tink

July 1, 2022 - September 3, 2025

Built and maintained customer onboarding workflows using React for UI and Node.js for backend orchestration, enabling small business owners to submit financial documents, verify identity, and receive lending decisions. Designed reusable, form-heavy React components with field validation, autosave logic, and conditional rendering tied to dynamic backend schemas—drastically reducing support tickets from broken user submissions. Implemented backend loan scoring logic using rule-based filters and cash flow analysis models written in TypeScript, allowing underwriters to tweak risk factors without requiring coded redeployment. Integrated e-signature workflows using DocuSign APIs on both backend (Node) and frontend (React modals and status indicators), ensuring traceable signature capture for all agreement flows. Built a dashboard for internal finance teams with React Table, allowing granular filtering, audit logs, and real-time status updates of application stages, wired directly to Postgr

Full Stack Engineer at Altabel Group

September 1, 2019 - September 3, 2025

Senior Software Engineer at Sopra Steria

June 1, 2025 - September 9, 2025

Led end-to-end backend and frontend architecture for healthcare, logistics, and financial platforms; implemented real-time data pipelines, microservices, and secure APIs. Integrated advanced AI components including LLMs and vector search; built RESTful APIs with OAuth 2.0 and Joi schema validation; designed a secure document upload system with AWS S3 pre-signed URLs; created dynamic React forms synced with backend schemas via API-driven configuration; implemented WebSocket-based messaging and dashboards; mentored junior engineers; containerized services with Docker and Kubernetes; established CI/CD pipelines on AWS.

Full Stack Engineer at Tokyo City University

July 1, 2022 - September 9, 2025

Built and maintained customer onboarding workflows using React for the UI and Node.js for backend orchestration; enabled small business owners to submit financial documents, verify identity, and receive lending decisions. Designed reusable React components with form validation; built Kafka- and Redis-powered data pipelines to ingest and cache data; integrated OpenAI API and LangChain for AI-assisted notes and research insights; implemented REST APIs with OAuth 2.0 authentication; constructed end-to-end data flows; designed deployment pipelines with Docker, Kubernetes, and Terraform; implemented secure document upload flow using pre-signed URLs.