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Portrait of Lizardo Mamani
Senior Java Backend EngineerPayments / fintechCloud-oriented systems

Lizardo Mamani

Senior Java Backend Engineer focused on APIs, payments, distributed systems, and cloud-oriented banking platforms.

Passionate about technology and innovation, I build reliable backend systems through cloud architecture and solid software design, mainly with Java on Azure-based platforms. With 15+ years across banking, fintech, payments, and distributed systems, I align engineering decisions with business OKRs using pragmatic practices such as DDD, CQRS, Hexagonal Architecture, and TDD. I focus on clarity, technical sustainability, and continuous improvement, keeping simplicity at the center of delivery.

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Professional Snapshot

Backend Engineering

Java backend development for APIs, microservices, and platform capabilities in banking and fintech contexts.

Distributed Systems

Experience with microservices, event-driven communication and reactive systems.

Payments & Financial Platforms

Backend work across digital payments, money transfers and banking platforms.

Technical Coordination

Support for engineering teams through standards, architecture decisions and onboarding.

Architecture & Modernization

Modernization experience using patterns such as Parallel Change and Canary Release.

AI-assisted Engineering Focus

Current design focus on AI-assisted engineering and RAG for technical documentation.

Experience Summary

Sep 2025 - Present

Barcelona, Spain

K-Lagan / AXA Seguros

Lead Software Engineer

Technical coordination and backend engineering

  • Coordinate technical alignment across 6 engineering teams, supporting architecture decisions, engineering standards, and onboarding for engineers.
  • Contribute to Java 21 backend development and REST API work in a cloud-oriented insurance environment.
  • Designed and proposed a RAG initiative for technical and business documentation using Spring AI and LangChain4j.
  • Java 21
  • Spring Boot
  • Spring AI
  • LangChain4j
  • Langfuse
  • ClickHouse
  • OpenTelemetry
  • pgvector
  • REST APIs
  • Azure DevOps
  • OpenShift
  • PostgreSQL

Dec 2023 - Sep 2025

Lima, Peru

Yape / BCP

Senior Software Engineer

Digital payments backend services

  • Developed and maintained backend services for digital payments and money transfers in fintech systems.
  • Worked with Java, Spring Boot, Quarkus, Kafka Streams, Azure components, PostgreSQL, Cosmos DB, and Datadog.
  • Participated in internal technical sessions on clean code, evolutionary architecture, API design, and mentoring.
  • Java 11/17/21
  • Spring Boot
  • Quarkus
  • NestJS
  • Kafka Streams
  • RxJava 3
  • Azure API Management
  • Microsoft Entra ID
  • Key Vault
  • Storage
  • Cosmos DB
  • Functions
  • PostgreSQL
  • Datadog
  • DDD

Jan 2021 - Dec 2023

Lima, Peru

Banco de Crédito del Perú / BCP

Technical Lead

BNPL technical leadership

  • Led technical work for backend APIs and microservices supporting BCP's Buy Now Pay Later product.
  • Coordinated modernization work using Parallel Change and Canary Release patterns.
  • Collaborated with business stakeholders and engineering teams on delivery and platform evolution.
  • Java 11
  • Spring Boot
  • Kafka
  • Angular
  • RxJava 2
  • Azure API Management
  • Microsoft Entra ID
  • Key Vault
  • Storage
  • Data Lake
  • App Services
  • Cosmos DB
  • HashiCorp Vault
  • SQL Server
  • Kibana
  • Dynatrace

Feb 2020 - Jan 2021

Lima, Peru

Agora Pay / Intercorp Retail

Senior Software Engineer

Mobile payments backend services

  • Built backend services and microservices supporting mobile and backend systems for Agora Pay.
  • Worked with event-driven communication using Google Pub/Sub.
  • Contributed across Java services, Kotlin/Firebase integrations, Redis, Elasticsearch, AWS, Azure DevOps, and Kibana.
  • Java 11
  • Microservices
  • Google Pub/Sub
  • Kotlin
  • Firebase
  • Elasticsearch
  • Redis
  • AWS
  • Azure DevOps
  • Kibana

Nov 2017 - Sep 2019

Lima, Peru

NTT DATA / BCP Project

Software Engineer

Reactive banking microservices

  • Developed reactive backend microservices for wholesale banking platforms within an event-driven architecture.
  • Contributed to architecture proposals aligned with long-term scalability.
  • Worked with Java 8, Spring Boot, Apache Kafka, RxJava 2, Angular, Azure Cloud, AKS, and Cassandra.
  • Java 8
  • Spring Boot
  • Apache Kafka
  • RxJava 2
  • Angular
  • Azure Cloud
  • AKS
  • Cassandra

Core Skills

Core strengths

Java backend engineeringAPI designPayments and banking platformsMicroservicesDistributed systemsTechnical coordination

Backend

Java 8/11/17/21Spring BootQuarkusREST APIsRxJava 2/3KotlinNestJS

Architecture

MicroservicesDDDAPI DesignEvolutionary ArchitectureParallel ChangeCanary Release

Cloud & DevOps

Azure API ManagementMicrosoft Entra IDKey VaultAzure StorageAzure FunctionsApp ServicesAzure DevOpsOpenShiftAKSAWS

Data & Messaging

Apache KafkaKafka StreamsGoogle Pub/SubPostgreSQLCosmos DBSQL ServerCassandraRedisElasticsearchData LakeClickHousepgvector

Observability

DatadogKibanaDynatraceOpenTelemetry

AI focus

Spring AILangChain4jLangfuseRAG Design

Current Focus

  • AI-assisted software engineering

    Current focus on practical AI support for engineering workflows, documentation, and developer productivity.

  • RAG design for documentation

    Design exploration for retrieval-augmented access to technical and business documentation.

  • Portfolio platform as living CV

    This site is structured as a maintainable professional platform that can evolve with real published work.

  • Architecture documentation and ADRs

    Ongoing focus on clearer architecture documentation, decision records and technical governance.

  • Java ecosystem modernization

    Continued focus on modern Java, Spring ecosystem practices, and backend platform evolution.