Igor Akkerman
Dipl.-Inform.
As an experienced cloud architect and software engineer, I support teams in building performant, highly scalable and resilient applications. I love working with skilled people, adopting the latest technologies and modern practices. In 20 years of professional full-stack development and systems design, I always aimed at the highest productivity and quality of code.
Technologies and Practices
- Kotlin/Java
- Spring Boot, Spring Data, JPA, Hibernate, JUnit, AssertJ, Kotest, MockK, jib, Gradle
- AWS
- S3, Lambda, EC2, ECS, Fargate, SQS, SNS, DynamoDB, RDS, Aurora, AppSync, API Gateway, Amplify, CodePipeline, CDK, CloudFormation, SAM, CloudWatch
- Google Cloud (GCP)
- GKE (fundamentals), Google Cloud Functions, Firestore, Firebase
- container orchestration
- Docker, Kubernetes, OpenShift, CloudFoundry
- messaging
- Kafka, RabbitMQ
- API
- REST, OpenAPI, GraphQL, gRPC, Protocol Buffers
- Database
- PostgreSQL, MySQL, MongoDB, Redis, Oracle, SQLite, Liquibase, Flyway
- TypeScript/JavaScript
- Node.js, Vite, Jest, Express, Netlify
- frontend
- React, Svelte, Astro, Redux, Playwright, Cypress, Flutter, HTML, CSS
- IoT
- MQTT, Mosquitto, Paho, Web of Things (WoT)
- architecture
- microservices, domain-driven design, event sourcing, CQRS, stream processing
- software craftsmanship
- clean code, SOLID, hexagonal architecture, design patterns, TDD, BDD
- release automation
- GitHub Actions, GitLab CI/CD, Jenkins, Terraform
- observability
- Datadog, Prometheus, Grafana, Kibana
- languages/scripting
- Kotlin, Java, Python, TypeScript, JavaScript, Dart, Lua, Bash, PowerShell
- agile
- Scrum, Kanban, pair-programming, trunk-based development
- tools
- Git, GitHub, GitLab, BitBucket, IntelliJ IDEA, VS Code, Figma, Jira, Confluence
Continuing Education
- meetups and conferences multiple events each week
- podcasts on software engineering
- workshops and video tutorials on new topics
- books, articles on latest IT developments and best practices
Languages
- German
- native
- English
- business fluent
- French, Italian
- proficient
- Spanish, Russian
- intermediate
Client Projects
digital farming: cloud architecture
Industry: digital farming
Process: Scrum
- assessed issues in architecture, code, security and processes, supported project management
- fully re-designed the whole system to be event-driven and serverless, created transition plan
- built a full-stack asynchronous PoC for new architecture, evaluated future technologies/services to adopt
- implemented a highly parallelized data processing pipeline
- trained team members in AWS services and modern engineering paradigms
AWS, CDK, Lambda, DynamoDB, AppSync, Amplify, GraphQL, Python, Pandas, React, TypeScript, Vite, pnpm, SNS, SQS, ECS, Docker, RDS, PostgreSQL, R, Java, Spring Boot, REST, BitBucket, Confluence, Teams
e-commerce platform: warehouse microservices
Industry: e-commerce, logistics
Process: Scrum, trunk-based development
- collected requirements for a core service to be consumed by multiple teams, designed its REST API
- implemented service functionality in Kotlin / Spring Boot, created project configuration
- optimized the build setup and code quality for shorter iteration cycles
- educated team members in idiomatic Kotlin, BDD using Cucumber and clean code
- conducted code and design reviews of React frontend
Kotlin, Spring Boot, REST, OpenAPI, AWS, Kubernetes, Docker, Nakadi, Kafka, CQRS, PostgreSQL, Jooq, R2DBC, Cucumber, TypeScript, React, GitHub, Google Workplace
Vehicle IoT platform prototype
Industry: automotive, RnD
Process: Scrum
- re-designed and implemented IoT bridge in Python
- developed features of IoT gateway in Go
- designed and implemented pairing between bridge and gateway using gRPC/Protobuf
- collected requirements of system security and defined security model
Docker, Python, Go, MQTT, Mosquitto, Paho, Web of Things (WoT), gRPC, Protocol Buffers (Protobuf), Raspberry Pi (ARM32, ARM64), GitLab
startup funding application platform
Industry: e-government
Process: Scrum
- created AWS architecture for new business domains
- supported the project management, defined user stories, introduced post-mortem process
- re-engineered single sign-on solution
- modeled domain and database for multi-tenant identity management
- led the backend team: conducted code/design reviews, coached junior developers
AWS, Lambda, SQS, SNS, ECS, Kubernetes, Docker, OAuth2, TypeScript, Node.js, Express, Mongoose, MongoDB, GitLab
vehicle and driver management system
Industry: logistics
Process: Scrum, pair-programming
- developed and operated features in REST microservices using Kotlin / Spring Boot
- performed large refactoring of React web microfrontends, assessed vulnerabilities
- set up AWS cloud infrastructure for new features, re-configured serverless cloud database
AWS, RDS, Aurora Serverless, Fargate, Docker, CloudFormation, CodeBuild, Kotlin, Spring Boot, AssertJ, React, Redux, TypeScript, Jest, Karma, Cypress, Kafka, Flyway, Datadog, Gradle, AWS Session Manager, BitBucket, Jira, Confluence
in-car product purchasing platform (ordering, payment, licensing)
Industry: automotive
Process: Scrum
- designed, implemented and operated Java Spring Boot REST microservices on CloudFoundry PaaS
- improved the code and design quality through reviews and large refactorings, taught clean code principles
- enhanced developer productivity by building a local Docker setup of the application stack
- produced PoC solutions to adopt AWS services and cloud architecture concepts, designed a data pipeline leveraging CQRS
AWS, SQS, SNS, RDS Aurora, REST API, CloudFoundry, Docker, Java, Spring Boot, Eureka, Hystrix, Ribbon, Feign, Zuul, Spring Cloud Netflix, JUnit 5, AssertJ, Sonar, Redis, PostgreSQL, Liquibase, Gradle, Jenkins Pipeline DSL, Logstash, Kibana, Greylog, Prometheus, BitBucket, Jira, Confluence
e-commerce platform: REST microservices
Industry: e-commerce
Process: Scrum
- designed, developed and operated containerized Java microservices for order processing
- transformed legacy Java modules into Spring Boot REST APIs using the strangler pattern
- re-architected and implemented automated unit, integration and acceptance tests using BDD
- set up automated build and release CI/CD pipelines, allowing unsupervised deployment into production
- supported the design of an SSO solution
Docker, Mesos, Marathon, Java, Spring Boot, REST API, Spring Batch, JPA, Hibernate, Retrofit, Hystrix, Zuul, reactive streams, JUnit, Google Truth, Cucumber, Spock, BDD, Rest-assured, Jenkins pipeline DSL, MongoDB, Oracle, Kibana, Grafana, BitBucket, Jira, Confluence
Former Client Projects
insurance statistics evaluation web application
Java EE full-stack design and development, project management
e-commerce platform: logistics components
Java Spring backend and Oracle SQL database development
document template management system
Java EE backend architecture and development, JCR data layer
international loyalty program
Java lead developer, JSF solution patterns, quality governance
healthcare profitability check web application
Java full-stack architecture and development
insurance dialog marketing administration web application
Java full-stack development
city childcare institution management system
Java J2EE full-stack development, application stack migration
residents’ data platform for authorities
Java backend development, XML data format conception, PKI setup
Side Projects
Email Processor
Server-side email filtering and processing (AWS)
- created Docker image for existing application
- built automated asynchronous data pipeline
- configured secret management
- set up logging/monitoring
AWS, ECS, Docker, Lambda, S3, SNS, SQS, SSM, KMS, CloudWatch, CloudFormation, Lua, IMAP
Java logging library for AWS Lambda
Java, AWS SDK, Lambda, CloudWatch, SLF4J, Logback, Gradle
Web CV
Generator of web-based CVs from structured data and markup, tailored individually for various clients
Astro, React, TypeScript, Vite, CSS, Vitest, Puppeteer, Netlify
PoC Projects
GCP/Firebase serverless REST application
TypeScript, Node.js, Express, GCP, Google Cloud functions, Firestore, Firebase, event sourcing
Svelte SPA
Svelte, JavaScript, Netlify
Flutter mobile app
Flutter, Dart, Android SDK, Firebase, Firestore