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Malt Strategy
Ali AminianAA

Ali Aminian

Senior Java Backend Engineer & Software Architect

€650/day
Frankfurt, DE
8-15 years
Java
Spring boot
Apache Kafka
Microservices
Kubernetes

Average response time: 1 hour

About Ali

Senior Java backend engineer and software architect with 17+ years building enterprise systems for banking, payments, trade finance and cloud-native platforms. I design and deliver event-driven microservices end-to-end – from architecture and Java/Spring Boot implementation through to Kubernetes, GitOps and observability on AWS, GCP and Azure.
Strongest where backend engineering meets infrastructure: reducing latency and cloud cost, hardening reliability, and replacing legacy ETL/monolithic systems with Kafka/Debezium CDC pipelines, Temporal workflows and Istio-based service meshes. Equally comfortable as in-house senior engineer/architect or as an independent freelance contractor.

  • German

    Conversational

  • English

    Fluent

  • Persian

    Native or bilingual

Remote only
Primarily works remotely

Experience

  • Yatta Solutions GmbH,
    Platform Engineer & Software Architect
    DIGITAL AND IT
    August 2025 - Today (10 months)
    Frankfurt, Germany
    • Architected the Yatta Integration Layer – a config-driven integration platform on Java 25, Spring Boot 4 (WebFlux), Temporal, gRPC and Kafka, enabling new third-party integrations (e.g. AVS fulfillment) via declarative JSON configs with zero code changes.
    • Designed and implemented Tink integration with 0Auth IBAN verification to enhance fraud prevention and account validation workflows with Adyen payByBank.
    • Architected and implemented an OpenFGA-based authorization model for centralized management of users, groups, and fine-grained access control in the vendor portal.
    • Designed and implemented the Yatta API Gateway platform using GraphQL Federation, providing a unified API layer across distributed microservices with centralized authentication, authorization and request orchestration.
    • Replaced NGINX + NLB with Istio service mesh and AWS ALB; rolled out WAF, OAuth (Cognito), IP whitelisting and RBAC across environments.
    • Migrated CDC from Confluent Cloud connectors to a self-hosted Kafka Connect + Debezium stack, reducing operational cost by ~80% across multiple environments.
    • Implemented the Transactional Outbox pattern with Debezium for reliable, exactly-once event publishing to Kafka with Avro and Schema Registry.
    • Migrated dunning/payment-recovery workflows from Airflow to Temporal, achieving 99.9% reliability for settlement handling.
    • Optimised Apache Airflow with deferrable sensors to handle 1000+ concurrent DAG runs without scaling the worker pool.
    • Refactored a monolithic Terraform codebase into 3 modular projects, cutting deployment time by ~45%.
    • Stood up full observability with OpenTelemetry, Tempo, Prometheus and Loki; automated dev/staging/prod with ArgoCD, Image Updater and Helm.
    Apache Kafka Java Amazon Web Services Terraform software architect
  • ZahlungsWERK GmbH,
    Architect and Senior backend developer
    October 2023 - August 2025 (1 year and 10 months)
    Hamburg, Germany
    • ● End-to-end responsibility for architecture of a payment and dunning platform based on Spring Boot, Kafka, PostgreSQL and Kubernetes
    • ● Developed & deployed scalable microservices with Java 21 & Spring Boot 3 , reducing latency by 40% and enhancing service resilience .
    • ● Optimized real-time data processing by integrating Google Pub/Sub, and Debezium , improving data consistency and reducing processing time by 35% .
    • ● Built a fraud detection model using Camunda BPM & Neo4j , enhancing security compliance and reducing fraud incidents .
    • ● Automated cloud infrastructure provisioning with Terraform & Helm , cutting manual deployment time by 50% .
    • ● Implemented Istio Service Mesh to support Blue-Green & Canary deployments , ensuring zero-downtime production rollouts .
    • ● Streamlined CI/CD pipelines with Argo CD & GitOps , achieving 100% automated deployments and reducing manual interventions .
  • axxessio GmbH,
    Senior Software Developer
    October 2019 - October 2023 (4 years)
    Darmstadt, HE, Germany
    • ● Built SSO authentication for TNM using Azure AD, Java 17, PostgreSQL, and Spring WebFlux , deployed on Azure Kubernetes Service (AKS) .
    • ● Developed & maintained backend microservices for MagentaTV (Deutsche Telekom) with Spring Boot, WebFlux, Quarkus, Kubernetes, Python and GitLab CI/CD .
    • ● Optimized backend microservices for MagentaTV (Deutsche Telekom) , migrating key services from Spring Boot to Quarkus , improving application startup time by 50% .
    • ● Enhanced testing & quality assurance by implementing JUnit & Mockito frameworks , increasing test coverage by 35% and reducing production bugs .
Check out Ali's experience

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Education

  • Master of Science in Computer Science
    Islamic Azad University
    2002
    Bachelor's degree, Computer science - hardware
  • High School Diploma, Mathematics
    Alborz High school
    1997
    High School Diploma, Mathematics

Certifications

Skill set

Cloud
Docker
PostgreSQL
MongoDB
Oracle
Redis
Maven
GraphQL
GraalVM
Neo4j
Argo CD
CI/CD
Backend Service Development
External API integration
Software Architecture
Cloud Integration
Microservices Architecture
Infra as Code
Google Cloud
Google Pub/Sub
Camunda
Python
Amazon Web Services
Temporal

Categories