01/10/2026 updated

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Senior Backend Engineer & Tech Lead

Assendelft, Netherlands
Worldwide
Computer Science
Assendelft, Netherlands
Worldwide
Computer Science

Profile attachments

Alexandru-Dascal-24-11-2025.pdf

About me

I’m a hands-on backend tech lead with 10+ years of experience designing and delivering secure, scalable, and resilient platforms for fintech and enterprise companies. I currently lead backend development for iDEAL 2.0, the Netherlands’ largest online payment platform, processing 100+ tps.

Java (Programming Language)ResearchActive ListeningAmazon Web ServicesTest AutomationBusiness RequirementsCircuit BreakersSoftware Design PatternsFault ToleranceScalabilityIncident ManagementPrometheusSecurity ManagingSystems DesignSoftware VersioningOpenapiTestingRoot Cause AnalysisMetricsSpring-bootBackendKubernetesApache KafkaApi DesignSafety PrinciplesDocker
? How I work:

Building applications: I write clean, reusable code, review peers’ work, and refactor where needed using design patterns.

End-to-end system ownership: I take responsibility for services from requirements to production—covering development, testing, release, and operations. I define and implement metrics, logs, dashboards, alerts, and documentation.

Incident management: I address and resolve production issues within SLA, reduce customer impact, and strengthen long-term reliability through root cause analysis and permanent fixes.

• Systems design: I evaluate architectural options and integration approaches across team-owned components, balancing business needs, performance, scalability, and timelines.

• Quality & improvement: I constantly look for process and system enhancements—designing and implementing practices that improve efficiency, resilience, and business performance.

• Communication & collaboration: I document designs and investigations clearly, adapt my message to the audience, and facilitate decisions by practising active listening and constructive debate.

? Technical strengths:
API design & security (OpenAPI, versioning, security best practices) • REST & Kafka integrations (synchronous + asynchronous) • Observability (Prometheus, Elastic: metrics, logs, dashboards, alerts) • Resilience patterns (retries, circuit breakers, graceful degradation, fallbacks) • Java, Spring Boot, AWS • Kubernetes, Docker • CI/CD pipelines, automated testing (unit, integration, performance, end-to-end)

Languages

EnglishFluentRomanianNative speaker

Project history

Tech Lead

Payconiq

Banking & Financial Services

50-250 team member

I am working on the iDEAL 2.0 project, the leading payment solution in the Netherlands, processing over 1.6 billion transactions annually.

Highlights:
  1. Led end-to-end delivery of functionalities, from requirement analysis through development, testing, and release to production, ensuring smooth go-to-market, robust monitoring, and incident management post-release.
  2. Led technical and architecture decisions in and across teams, most notably “iDEAL email verification” and “the add the second bank to an iDEAL profile”
  3. Acted as a point of contact for technical guidance, troubleshooting, and architectural decisions, such as resolving critical production issues, clarifying architectural choices, and ensuring communication with other teams.
  4. Drove key technical improvements such as Kafka to MSK migration, certificate management improvements, iDEAL alerts and monitoring by coordinating closely with architects and the Product Owner.
Skills: System Design, Team Leadership, Mentorship, Teamwork, Certificate management, System Observability,

Senior Backend Engineer

Payconiq

Banking & Financial Services

50-250 team member

Highlights:
  1. Enhanced sprint goal consistency through Test-Driven Development (TDD) and pair programming utilising Coding Kata.
  2. Designed and developed microservices as part of the iDEAL 2.0 solution, with a focus on user registration functionality.
  3. Designed and developed REST API gateways for issuers and acquirers connections, capable of processing more than 500 API calls per second.
  4. Additional roles: SRE Deputy role, Security Champion
Skills: Java, Kotlin, Spring Boot, WebFlux, OpenAPI, REST, Docker, K8S, Kafka, MongoDB, GitlabCI, System Design, Prometheus, Grafana, Elastic, AWS(S3, PinPoint, MSK)

Java Software Developer

Worldline

Banking & Financial Services

250-500 team member

I worked on an airline transaction processing solution (BSP), improved the service's flexibility to accommodate acquirer-specific fields and expanded connections to multiple payment platforms and transaction file providers
Highlights:
  1. Developed configurable microservices to support new IATA CSP file providers.
  2. Expanded payment capabilities to include multiple local card types in addition to VISA and Mastercard.
  3. Implemented support for 3D Secure 2.0 data.
  4. Introduced coding katas to the team, which enhanced pair programming and team collaboration.
Skills: Java 11, Kotlin, Spring Boot, JPA/Hibernate, SQL, Oracle, Docker, Linux, Cucumber, Jenkins, ActiveMQ


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