Benyamin Delshad

Backend Software Engineer

Benyamin Delshad

I build event-driven backend systems in Kotlin and Java: microservices, Kafka pipelines, and REST APIs that hold up in production.

Frankfurt am Main, Germany

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About

I'm a backend engineer with 4+ years of experience building microservices and REST APIs. I work at Yatta Solutions in Frankfurt, a German software company that mixes client consulting with building its own products. I'm on Checkout, Yatta's e-commerce platform for digital goods, covering payment, fulfillment, and delivery. My current toolkit: Kotlin, Spring Boot, Apache Kafka, Temporal, and Domain-Driven Design, applied to event-driven systems that move real products to real customers.

Before this I delivered client projects for the energy and logistics industries, and before industry I did research on distributed systems and algorithms in Switzerland, Austria, and France.

I care about how teams work, not just what they ship: I've facilitated retrospectives, organized team events, and taught at every stage of my career, from CS tutorials at the University of Tehran to software-engineering courses at St. Gallen.

I work in English (C1), get along in German (B1, currently taking a course), and Persian is my native language.

Away from the keyboard I hunt authentic local food while traveling, study Middle-earth linguistics, keep up my Wizarding World lore (Hufflepuff, sorted and content), and build detailed LEGO models, including Hogwarts Castle.

Tech Stack

Languages

  • Kotlin
  • Java
  • Python
  • SQL
  • Bash
  • C/C++

Backend

  • Spring Boot
  • REST APIs
  • Microservices
  • Event-driven architecture
  • Apache Kafka
  • Avro + Schema Registry
  • Temporal workflow orchestration
  • Saga pattern
  • Idempotency
  • Dead-letter queues

Data

  • PostgreSQL
  • Oracle DB
  • Flyway
  • JPA/Hibernate

Infrastructure

  • Kubernetes
  • Docker/Podman
  • GitHub Actions
  • GitLab CI/CD
  • AWS S3
  • Confluent Cloud
  • Micrometer + structured logging
  • Grafana

Practices

  • Domain-Driven Design
  • Hexagonal architecture
  • Clean Code
  • TDD (JUnit, Kotest, MockK, Testcontainers)
  • SonarCloud quality gates
  • Scrum
  • Code review

Experience

Software Engineer · Checkout · Yatta Solutions

Jul 2026 – present · Frankfurt am Main, Germany
  • Architected and built a greenfield, event-driven fulfillment service (Kotlin, Spring Boot) that turns a completed purchase into everything the customer is entitled to: generated tickets, a print-at-home PDF, archival, and a delivery email.
  • Designed a Temporal workflow orchestrating multi-channel delivery with saga compensation, graded blocking versus best-effort failure handling, and purchase-scoped idempotency so a retried order never delivers twice.
  • Built five Kafka and Avro consumer pipelines against Confluent Schema Registry, each with its own retry classification, a dead-letter path, and metrics that surface a stalled consumer before customers notice.
  • Implemented VDV-KA compliant Aztec barcode rendering as a dependency-light library (ZXing plus a hand-written 1-bit PNG encoder built on JDK primitives), verified by decode-back tests. The barcodes are scanned by real ticket-inspection devices.
  • Structured the service as six independently extractable bounded contexts (Domain-Driven Design, hexagonal architecture), with streaming upload and download paths that never buffer a document in memory, and sanitized error boundaries that keep signed URLs and personal data out of logs.
  • Drove release quality: Testcontainers-backed integration tests, a SonarCloud quality gate, reproducible builds with dependency verification, and design specs and on-call runbooks treated as deliverables.
  • Kotlin
  • Spring Boot
  • Temporal
  • Apache Kafka
  • Avro
  • PostgreSQL
  • Flyway
  • AWS S3
  • Kubernetes
  • GitHub Actions
  • Gradle

Software Engineer · SMA Solar project · Yatta Solutions

Dec 2023 – Jun 2026 · Frankfurt am Main, Germany
  • Developed an EEBUS protocol driver to process grid-based power-limitation requests, ensuring compliance with German energy regulations (§ 14a EnWG and § 9 EEG).
  • Architected GitLab CI/CD pipelines automating builds, code formatting, static analysis, and test coverage.
  • Built core energy-management services and APIs in a cross-functional team, optimizing end-user energy consumption and costs.
  • Helped achieve an 80%+ customer-satisfaction score (NPS) by consistently delivering high-quality software.
  • Java
  • REST APIs
  • Python
  • Bash
  • TypeScript
  • GitLab CI

Software Engineer · Rhenus Logistics project · Yatta Solutions

Apr 2022 – Nov 2023 · Frankfurt am Main, Germany
  • Cut shipment-processing overhead with an automated compliance system that proactively blocks high-risk shipments to sensitive destinations.
  • Engineered a Spring Boot REST service providing end users with real-time shipment quotes.
  • Java
  • Spring Boot
  • JavaScript
  • Oracle DB

Doctoral Researcher & Teaching Assistant · University of St. Gallen

Oct 2020 – Mar 2022 · St. Gallen, Switzerland
  • Accelerated distributed-systems development by designing a domain-specific language that automates operation-level consistency inference.
  • Taught in courses on engineering software systems, software engineering, and programming for data science.
  • Java
  • NoSQL
  • Maven
  • JML

Research Intern (M.Sc. thesis), Game Theory & Simulation · Institute of Science and Technology Austria (ISTA)

Feb 2020 – Sep 2020 · Klosterneuburg, Austria
  • Validated theoretical research by building evolutionary game-theory simulations to analyze probabilistic cooperation strategies, under the supervision of Prof. Krishnendu Chatterjee.
  • MATLAB
  • Algorithms

Research Intern, Graph Algorithms for Transit Routing · IRIF

Apr 2019 – Sep 2019 · Paris, France
  • Modeled public transit networks as temporal graphs and designed algorithms to assess infrastructure changes using real-world datasets.
  • C/C++
  • Algorithms
  • Graph theory

Teaching Assistant · University of Tehran

Sep 2015 – Feb 2018 · Tehran, Iran
  • Ran tutorials across core CS courses: graph theory and applications, design and analysis of algorithms, fundamentals of combinatorics, advanced programming (C++), and foundations of programming (Java).
  • C++
  • Java
  • Algorithms

Education & Achievements

M.Sc. Computer Science · Université Paris Cité

2018 – 2020 · Paris, France
  • Completed the MPRI track (Master Parisien de Recherche en Informatique); master's thesis supervised by Prof. Krishnendu Chatterjee (ISTA).
  • Merit-based scholarship from the Mathematical Sciences Foundation of Paris (Fondation Sciences Mathématiques de Paris).

B.Sc. Computer Science · University of Tehran

2014 – 2018 · Tehran, Iran
  • Ranked 4th nationally in the Iranian graduate-entrance exam (Concours) for Computer Science (2017), after ranking 8th in 2016.
  • Two-time bronze medalist, Iranian National Mathematics Competition for University Students (2016, 2017).
  • Three-time ACM/ICPC contestant, Asia Region, Tehran site (2014–2016); ranked 8th in 2016.
  • Prof. Ahrabian Memorial Faculty Fellowship: awarded to the top 7 students across Computer Science, Mathematics, and Statistics.
  • University of Tehran Foundation Fellowship: top 500 among 30,000+ students.