Ionut Baranga-Seasoned Software Engineer with Product Mindset | T-Shaped, Backend-Heavy | Java, Node.js, AWS, React.js
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Experience
Senior Backend Engineer
FedEx
- Developed microservices and integrations to simplify compliance with international shipping regulations for collaborative shipping services
- Designed and developed APIs for multi-party collaboration in shipment workflows
- Participated in multi-layered client meetings to address technical questions and facilitate service delivery
- Led Optimizely rollout planning for smooth adoption of new features, ensuring system stability and minimizing user disruption
- Improved CI/CD speed and reliability by refactoring integration tests and migrating them to TestContainers
- Monitored production logs, metrics, and alerts post-deployments to ensure system health and performance
Lead Backend Engineer
US Stealth Startup developing a social app
- Took full responsibility of the backend development and worked in close collaboration with the company owner, a Google Cloud Expert and a Senior Mobile Developer
- Identified key user interactions areas in need for optimisation by analyzing API usage patterns from the mobile app
- Boosted potential user engagement by designing and developing the backend side of a user-targeted, real-time notification system
- Enhanced application security, maintainability and error handling by migrating it from JavaScript to TypeScript and adopting schema-based request validators, and introducing API integration testing
- Improved data retrieval speed by optimizing MongoDB queries and indexing, including specialized geospatial queries
- Improved monitoring and reduced troubleshooting time by establishing prod-dev parity and introducing structured logging
Hands-on Tech Lead & AWS Solution Architect
Digital Marketing SaaS Platform
- Documented the business domain and mapping out use cases, in close collaboration with the company's CEO and a team of three developers
- Redesigned the platform with AWS, EKS, Fargate, DynamoDB, RDS, S3, CloudFront, and CloudFormation
- Supported the dev team with production-ready Docker recipes, Kubernetes knowledge, code reviews, development & observability best practices
- Decreased delivery time to less than 3 minutes by reintroducing CI/CD pipelines in GitHub actions
Senior Software Engineer & Feature Lead
Bolt.eu
- Led the development of new features for end-users and internal staff, from idea to positive execution, from architecting to developing and deploying using cloud-native technologies
- Automated management of discrepancies between the checked-out carts and the delivered orders, saving hundreds of customer-support hours per month
- Increased flexibility for end-users with backward-compatible API extensions covering multiple delivery-options support
- Enriched internal tools with relevant contextual data fetched from multiple services, saving several hours of engineering support per month
- Improved the database design and ease of extending features by generifying relevant database columns, in forward and backward-compatible steps with zero downtime
Senior Software Engineer
Kambi
- Evolved microservices and trading tools to accommodate new sports and bet offers, while increasing trading productivity and automation
- Reduced complexity of existing integrations by introducing a new offer generator microservice responsible for specialized player bet-offers
- Improved extensibility and speed of accommodating new bet-offer types by migrating a games-statistics component from a RESTful to a decoupled Kafka topics-based approach
- Centralized configuration with radical updates of a trading-tools-configuration full-stack application
- Reduced delays caused by performance issues by monitoring & correlating browser and server metrics, identifying, and fixing bottlenecks
Senior Application Developer
IBM
- Implemented market specific financial plans calculators services, tailored for both individual consumers (retail) and B2B clients across the German, French, and Spanish markets
- Optimized the migration to new JavaEE application containers (Payara 4.0) by proactively investigating potential compatibility and performance issues
- Guided and mentored new developers in onboarding processes
Senior Software Engineer
Alibaba Group
- Designed and implemented scalable integrations with shopping and retargeting platforms and e-commerce modules for interfacing product data feeds and integrating them into a new platform
- Increased seller success by implementing a system that automatically synchronized product data to GoogleAds and AdRoll through bulk data feeds and real-time API updates
- Contributed to adoption increase of a brand-new e-commerce platform by implementing automatic synchronization of product data from multiple marketplaces
- Developed centralized libraries and participated in discovering, implementing, and disseminating new technologies
Software Engineer
Alibaba Group
- Designed and developed product import flows (RESTful APIs, FTP data feeds) that allow customers to seamlessly integrate their inventory with a new marketplace
- Developed full-stack Product Admin Tools used for optimized supervision of the seller integration flows
- Worked on centralized libraries and participated in discovering, implementing, and disseminating new technologies
Industry experience
See where this freelancer has spent most of their professional time.
Experienced in Information Technology, Sport, Retail, Transportation, and Banking and Finance.
Business area experience
See which departments and functions this freelancer has contributed to most.
Experienced in Information Technology and Product Development.
Summary
𝗣𝗿𝗼𝗱𝘂𝗰𝘁-𝗳𝗼𝗰𝘂𝘀𝗲𝗱, seasoned software engineer helping businesses worldwide deliver 𝘀𝗰𝗮𝗹𝗮𝗯𝗹𝗲, 𝗺𝗮𝗶𝗻𝘁𝗮𝗶𝗻𝗮𝗯𝗹𝗲, and 𝗽𝘂𝗿𝗽𝗼𝘀𝗲-𝗳𝗶𝘁 solutions through 𝗲𝗻𝗱-𝘁𝗼-𝗲𝗻𝗱 𝗱𝗲𝗹𝗶𝘃𝗲𝗿𝘆.
⸻
𝗘𝘅𝗽𝗲𝗿𝗶𝗲𝗻𝗰𝗲 𝗛𝗶𝗴𝗵𝗹𝗶𝗴𝗵𝘂𝗍𝘀
𝟭𝟮+ 𝘆𝗲𝗮𝗿𝘀 of full-stack, backend-heavy engineering across Alibaba, FedEx, Bolt, Kambi, and IBM - navigating multi-sided marketplaces, sports-betting trading platforms at scale, and global logistics & compliance.
𝗥𝗲𝗱𝗲𝘀𝗶𝗴𝗻𝗲𝗱 a SaaS platform using 𝗔𝗪𝗦 services (EKS, DynamoDB, SQS, S3) for scalability and faster feature delivery
𝗘𝗻𝗱-𝘁𝗼-𝗲𝗻𝗱 𝗱𝗲𝗹𝗶𝘃𝗲𝗿𝘆 𝗲𝘅𝗽𝗲𝗿𝗶𝗲𝗻𝗰𝗲: requirements analysis, solution architecture, development, cloud migrations, performance and scalability improvements, technical debt reduction
𝗪𝗼𝗿𝗸𝗶𝗻𝗴 𝗿𝗲𝗺𝗼𝘁𝗲𝗹𝘆 since 2019 in distributed and autonomous teams communicating asynchronously
Skills
- Architectures: Cqrs, Crud, Ddd, Event-Driven, Microservices
- Backend: Java, Typescript, Spring, Node.Js, Kafka, Redis, Postgres, Mysql, Mongo
- Cloud: Aws, Ec2, Eks, Cloudformation, Sqs, Sns, S3, Firebase, Google Cloud Run, Azure Aks
- Frontend: Javascript, Typescript, Mui, React.Js, Redux, Tailwind
- Other: Java Spring Boot, Kubernetes, Docker, Postgresql, Reactive-Systems, Microservices, Tdd, Event-Driven
Languages
Education
University POLITEHNICA of Bucharest
Master’s Degree · Internet Systems Engineering · Bucharest, Romania
University POLITEHNICA of Bucharest
Engineer’s Degree · Computer Science · Bucharest, Romania
Statistics
Experience
Global experience
Expertise
Qualifications
Profile
Frequently asked questions
Have questions? Find more information here.
Ionut is based in București, Romania and prefers 100% remote projects.
Ionut speaks the following languages: Romanian (Native), English (Advanced).
Ionut has at least 14 years of experience. During this time, Ionut has worked in at least 7 different roles and for 7 different companies. The average length of individual experience is 2 years and 9 months. Note that Ionut may not have shared all experience and actually has more experience.
Based on recent experience, Ionut would be well-suited for roles such as: Senior Backend Engineer, Lead Backend Engineer, Hands-on Tech Lead & AWS Solution Architect.
Ionut's most recent position is Senior Backend Engineer at FedEx.
In recent years, Ionut has worked for FedEx, US Stealth Startup developing a social app, Digital Marketing SaaS Platform, and Bolt.eu.
Ionut is most experienced in industries like Information Technology, Retail, and Sport. Ionut also has some experience in Transportation and Banking and Finance.
Ionut is most experienced in business areas like Information Technology and Product Development.
Ionut has recently worked in industries like Transportation and Information Technology.
Ionut has recently worked in business areas like Information Technology and Product Development.
Ionut holds a Master in Internet Systems Engineering from University POLITEHNICA of Bucharest and a Bachelor in Computer Science from University POLITEHNICA of Bucharest.
Ionut is immediately available full-time for suitable projects.
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Calculated based on our freelancers’ daily rates as of 25 Aug 2026. Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.
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