Skip to details
Răzvan Zavalichi
Senior Software Engineer

Răzvan
Zavalichi

9 years building distributed systems and data pipelines for fintech, e-commerce, healthcare, cloud and automotive companies.

See selected workResume

NOWSenior Software Engineer (Contractor)ex-AWS

Chapter 01 / 06 · Workflow

Present

JUL 2026 → PRESENT · Contract · remote

Independent Contractor

Senior Software Engineer

  1. Scalable backend systems, designed and built from the ground up
  2. Data processing, integration and automation workflows
  3. Orchestration of distributed and parallel processes
  4. AI-assisted engineering and knowledge systems
Languages
Python · TypeScript
Cloud
AWS · GCP
Architecture
Domain-driven design · Event sourcing
Orchestration
Dagster · Temporal
Data
Relational databases · NoSQL databases

Chapter 02 / 06 · LMS core

JAN 2024 → AUG 2026 · Fintech lending

Canopy

Senior Software Engineer

A loan management platform for installment loans, lines of credit and credit cards, from origination to the end of the loan.

Latency1.2 s → 200 mscard authorization at 4k requests/s

  1. Built the lines-of-credit core: draws, credit limits and transactions
  2. Scheduled events that apply interest and fee rules
  3. Secured lending and compliance: collateral, SCRA/MLA caps, dispute credits
  4. Card issuer integration, prototype to production
Stack
Python · TypeScript · React · PostgreSQL
Architecture
Domain-driven design · Webhooks
AWS
Lambda · API Gateway · SQS · Airflow · DMS
“If you want it done - but done for good - have Răzvan own it.”
Vlad Nemes · Director of Engineering

Chapter 03 / 06 · Data pipeline

OCT 2022 → DEC 2023 · E-commerce data

SAG Digital

Software Developer

  1. Ingested data from many sources, each with its own rules
  2. Processed it in Azure ETL services, with third-party steps like translation
  3. Delivered it in the exact format each team needed
Languages
TypeScript · C#
Azure
Functions · Durable Functions · Service Bus · Cosmos DB · API Management
Tools
SQL · MongoDB · Terraform · GitHub Actions
“…writing ETL systems that can seamlessly process and load millions of rows of data using industry-standard technologies.”
Adrian Mota · Software Engineer

Chapter 04 / 06 · Scale-out

NOV 2021 → OCT 2022 · AWS data platform

Amazon

Software Development Engineer

A data platform that served customers at very large scale, on most of the AWS stack. Most of it was already built: a great place to learn.

Scale~21kEC2 instances running at peak

  1. Added features to a cell-based ETL that was already running
  2. A planner that groups incoming data into work plans every minute
  3. AWS Batch jobs tracked by Step Functions, then a completeness check
  4. Lab Owner, "Cloud Shape your Idea" · AWS virtual labs for students
Languages
Java · Python · TypeScript · Node.js · HTML · CSS
AWS
Lambda · Step Functions · Batch · EC2 · DynamoDB · S3 · SQS / SNS · API Gateway
Infra
AWS CDK

Chapter 05 / 06 · Test loop

AUG 2019 → NOV 2021 · Automotive testing

Veoneer

Software Tool Development Engineer

A hardware + software rig that simulates car sensors to test ECUs, built to replace very expensive commercial test equipment.

  1. Tools that car makers use to test airbag and seatbelt systems
  2. Owned the FlexRay and Ethernet modules and a Wireshark-like protocol tracer
  3. Built a license service (ASP.NET Core, MySQL) with 100% test coverage
  4. Trainer, "Thinking in Code" · Helped students code better
Languages
C#
.NET
.NET Framework · .NET Core · WPF · MVVM
Protocols
CAN · FlexRay · LIN · Ethernet
“…he is one of the most curious and technology-driven person I have met. He is proactive and incredibly reliable…”
Roxana Popescu · Manager Software

Chapter 06 / 06 · V-model

JUL 2017 → AUG 2019 · Automotive embedded

Continental Automotive

Intern Software Developer → Software Developer

  1. Embedded C for engine control units (ECUs), from Matlab requirements
  2. Checked each release: few warnings, test coverage above 90%
  3. Moved up to safety code: the crash memory that keeps the last speed and mileage
Languages
C (embedded)
Tools
Matlab · test benches · analysis tooling

The system · today

All the pieces, working as one system.

Where did I use it?

Pick a skill or a domain to light up where I used it.

Experience

The same story as a plain list · 6 roles

  1. JUL 2026 → PRESENT · 4 mos · Remote

    Independent ContractorSenior Software Engineer · Contract

    Backend systems designed and built from the ground up, with domain-driven design and event sourcing. Data processing, integration and automation workflows. Orchestration of distributed and parallel processes. AI-assisted engineering and knowledge systems. Python, TypeScript, AWS, GCP, Dagster, Temporal, relational and NoSQL databases.

  2. JAN 2024 → AUG 2026 · 2 yrs 8 mos · Remote

    CanopySenior Software Engineer · Contract

    A loan management platform for installment loans, lines of credit and credit cards, from origination to the end of the loan (pay-off or charge-off), with scheduled events that apply rules for interest, fees and more, such as daily interest accrual. Owned the lines-of-credit core (draws, credit limits, transactions), built with domain-driven design and dependency injection; it became the template for later modules. Built secured lending (collateral, liens, loan-to-value) ahead of its deadline, and automated compliance: SCRA/MLA rate caps and refunds, provisional credit on disputes, payment deferral. Took a card issuer integration from prototype to production; with a teammate, cut card authorization from 1.2 s to 150–200 ms at 4k requests/s in load tests. Co-led a query redesign that cut line-of-credit loading from 40 s to under 4 s. Python, TypeScript, React, PostgreSQL, SQLAlchemy, AWS.

  3. OCT 2022 → DEC 2023 · 1 yr 3 mos · Remote

    SAG DigitalSoftware Developer · Full-time

    ETL services on Azure for an e-commerce company: ingesting data from many sources with different rules, processing it, and delivering it in the format each team needed. Integrations with third-party services before and after processing, such as translation. Service definitions and architecture diagrams. TypeScript, C#, Azure Functions, Service Bus, Cosmos DB, Terraform.

  4. NOV 2021 → OCT 2022 · 1 yr · Iași, Romania

    AmazonSoftware Development Engineer · Full-time

    A cell-based ETL that ingested, processed and served data to customers at very large scale, with up to ~21k EC2 instances running at peak. Most of it was already built; added features on top of it: the planner that groups incoming data into work plans every minute, batch processing on AWS Batch and Step Functions, and the check that each data partition is complete before it is published. A great place to learn most of the AWS stack. Java, Python, TypeScript, Node.js, HTML, CSS, AWS CDK. Also Lab Owner at “Cloud Shape your Idea”.

  5. AUG 2019 → NOV 2021 · 2 yrs 4 mos · Iași, Romania

    VeoneerSoftware Tool Development Engineer · Full-time

    Test tools that car makers use to check airbag and seatbelt systems: a hardware + software rig that simulates car sensors to test ECUs, built to replace very expensive commercial test equipment, and a tool that reads crash-test data from the car's black box. Owned the FlexRay and Ethernet modules, a Wireshark-like tracer for car networks, and the power supply and voltage curve modules for ECU tests. Built a license service (ASP.NET Core, Entity Framework, MySQL) with 100% test coverage, and a database for test results. CAN, FlexRay, LIN and Ethernet protocols, UDS and DoIP diagnostics. C#, .NET, WPF. Also Trainer at “Thinking in Code”.

  6. JUL 2017 → AUG 2019 · 2 yrs 2 mos · Iași, Romania

    Continental AutomotiveIntern Software Developer → Software Developer · Full-time

    Embedded C for engine control units (ECUs) in the Powertrain department, written from Matlab requirements and tested on hardware benches. Checked each project before delivery (warnings, test coverage above 90%) and filed the fixes. After about 8 months, moved up to safety-level code, such as the crash memory that keeps the last speed and mileage. C, Matlab.

Recommendations

Written on LinkedIn by people I worked with · 7

  1. July 2025

    Vlad Nemes

    Director of Engineering · Managed Răzvan directly

    If you want it done - but done for good - have Răzvan own it. I witnessed first hand Răzvan's ability to navigate uncertainty, pick up a new skill or research which technology/pattern fits the task best - always leaving a trail of documents motivating his decisions & sharing context. When dealing with complexity, Răzvan is a first principled thinker with an unrelenting will to untangle the problem and see it done to completion. Răzvan has an impeccable work ethic, deep engineering & software architecture skills and a diverse breadth of experiences to back his straightforward opinions. I strongly recommend Răzvan as a staff engineer.

  2. May 2025

    Alex Edward Ball

    Technical Lead · Was senior to Răzvan

    I've had the absolute pleasure of working closely with Răzvan as his tech lead, and I can honestly say he's one of the most positive, reliable, and talented engineers I've ever worked with. Every interaction with him is a breath of fresh air-he brings an upbeat, drama-free attitude to everything he touches, no matter how complex or ambiguous the task. What stands out most about Răzvan is how consistently he delivers. He tackles product requirements with thoughtfulness and speed, always asking the right questions, and often going above and beyond by proposing multiple well-architected solutions.

  3. January 2024

    Adrian Mota

    Software Engineer · Managed Răzvan directly

    Razvan is a seasoned professional, with strong expertise on everything regarding cloud development. He is also a quick learner, with the ability to switch learn new technologies in short time. I had the privilege to work with him as a colleague on various topics, ranging from debugging and fixing legacy code to writing ETL systems that can seamlessly process and load millions of rows of data using industry-standard technologies. He's a good listener and a great sparring partner, and his advice is always well backed up by thorough study on the subject. Razvan is also a great individual, a funny person with a great sense of humor that could bring a positive vibe in any team.

  4. December 2023

    Rana Matusch-Fehling

    Product Owner Product Data · Worked on the same team

    Razvan is an exceptional colleague and developer within our scrum team. His unwavering motivation, tech-savvy approach, and forward-thinking mindset consistently placed him one step ahead, envisioning the optimal service or solution. As a Product Owner, collaborating with Razvan was a seamless experience due to his ability to effortlessly translate business requirements into technical specifications, paving the way for sustainable solutions. His open-mindedness, laser-focused work ethic, and collaborative spirit made him a standout team player.

  5. May 2023

    Dieke Meyer

    Digital Entrepreneur, Consultant, Product Owner · Worked at different companies

    I had the pleasure of working with Răzvan Zavalichi on a recent eCommerce project, where he excelled as a Senior Software Developer. Răzvan consistently demonstrated exceptional professionalism, meticulous attention to detail, and an unwavering commitment to delivering high-quality work. Răzvan's passion for exploring new topics was evident throughout our collaboration. He eagerly embraced emerging technologies and methodologies, enabling him to provide innovative solutions that significantly contributed to the project's success.

  6. November 2021

    Roxana Popescu

    Manager Software · Worked on different teams

    I have had the opportunity to work with Razvan in the past months and I can say that he is one of the most curious and technology-driven person I have met. He is proactive and incredibly reliable, any team is lucky to have him and any leader will find a key player in him.

  7. 2021

    Vlad Isoc

    Software Developer · Worked on the same team

    He is my favorite workmate. Definitely high skilled, interested in new technologies and focused on developing high quality software.
Resume PDF
010203CONTINENTAL2017→ 2019010203+VEONEER2019→ 2021010203+AMAZON2021→ 2022010203SAG DIGITAL2022→ 202301020304CANOPY2024→ 202601020304CONTRACTOR2026→ NOW

Details

Toolkit and education

The tools I use most, by area, and where I studied.

Toolkit

Languages
Python · TypeScript / Node.js · Java · C# · C
Architecture
Domain-driven design · Event sourcing · Event-driven · Distributed systems · REST & GraphQL APIs
Orchestration
Temporal · Dagster · Airflow
Data
SQL & NoSQL databases · PostgreSQL · MongoDB · ETL pipelines
Cloud
AWS · Azure · GCP
AWS
Lambda · API Gateway · SQS / SNS · Step Functions · DynamoDB · S3 · EC2 · Batch · DMS
Azure
Functions · Durable Functions · Service Bus · Cosmos DB · API Management · Data Factory · App Service
Infra
Terraform · AWS CDK · CI/CD
Frontend
React
Automotive
CAN · FlexRay · LIN · Ethernet · UDS · DoIP · embedded C

Education

  • 2019–2021

    M.Sc. Distributed Systems and Web Technologies

    Gheorghe Asachi Technical University of Iași

    Master's project
  • 2015–2019

    B.Sc. Computer Engineering

    Gheorghe Asachi Technical University of Iași

Illustrated portrait of Răzvan Zavalichi

Contact

Get in touch.

Write to me by email or on LinkedIn. Or ask zBio, the chat button in the corner. It answers questions about my work.

Download resume