Sergio Linares Peralta

01 · Summary

SENIOR SOFTWARE ENGINEER / TECH LEAD · MADRID, ES · OPEN TO OFFERS

12+ years building large-scale production platforms. Currently tech-lead on the FinOps backend at Maersk: a scalable, multi-service invoicing platform for enterprise logistics customers, processing 1M+ invoice lines a day across 30+ carrier integrations. Event-driven .NET microservices on AKS, designed for high availability, resilience and continuous evolution; end-to-end observability with OpenTelemetry. Direct ownership of customer-facing services and technical decisions aligned with business needs.

FOCUSEvent-driven .NET / DDD CLOUDAzure (AKS) OBSOpenTelemetry / Grafana YEARS12+ SCALE1M+ invoice lines/day · 30+ carriers

PRODUCTION SCALE EVENT-DRIVEN .NET DDD / CQRS KUBERNETES (AKS) OBSERVABILITY MULTI-TENANT

02 · Experience

MAERSK

SENIOR SOFTWARE ENGINEER · NOV 2021 → PRESENT

CURRENT

FinOps platform

MAR 2024 → PRESENT

Tech-lead on a scalable, multi-service invoicing platform behind enterprise logistics customers, processing 1M+ invoice lines a day across 30+ carrier integrations. High-availability, multi-tenant production system in continuous evolution, with technical decisions aligned with business needs.

Designed event-driven .NET microservices on AKS · Service Bus + Kafka, Outbox, eventual consistency · architected for scalability and resilience.NET · AKS

Lead developer & architect of CarrierCostProcessor · integrated 30+ carriers feeding 1M+ invoice lines/day · FTP ingestion of carrier cost files, builder-pattern carrier onboarding (with AI assist), Outbox + Kafka with Schema Registry, automated E2E + integration test scaffolding per carrierCCP · KAFKA

Lead developer & architect of Crucible · .NET 10 generic event-processing platform that consumes CCP feeds via Kafka and produces invoice-line records in the shared FinOps DB · cut processing from 3h to 30min and, with added visibility and monitoring, reduced support tickets by 50% · CQRS, EF Core, OpenTelemetry, Testcontainers E2ECRUCIBLE · CQRS

Owned end-to-end observability · OpenTelemetry collector, Grafana (Loki, Prometheus, Tempo), GoAlert + Teams alertsOTEL · GRAFANA

High quality bar · unit, integration and E2E tests across critical billing pathsTESTING

Led a new microservice for invoice-PDF generation (backend → object storage), customer-facingPDF · STORAGE

Modernised CI/CD pipelines and led the migration to Kubernetes (AKS)CI/CD · AKS

Active in product and tech-evolution decisions: framework upgrades, infra direction, on-call processes, continuous improvementPRODUCT · DECISIONS

TrackShipment team

SEP 2023 → MAR 2024

Onboarded a major logistics customer onto tracking and shipping-label APIsONBOARDING

Set up the OpenTelemetry stack with structured logs, metrics and tracesOTEL

Led migration from Azure Web Apps to AKS using company-level toolingAKS

Drove .NET version upgrades across multiple servicesUPGRADES

Internal logistics & Shopify shipping app

NOV 2021 → SEP 2023

Lead developer on a Shopify app (Laravel + React) for shipping labels · OAuth + Maersk internal API integrationSHOPIFY · LARAVEL

Led PHP → .NET and on-prem → Azure migration of internal logistics APIsMIGRATION

BABEL SISTEMAS DE INFORMACIÓN SENIOR WEB DEVELOPER · FEB 2019 → NOV 2021 EU CONSULTANCY

E-Quironsalud · Prestashop / Symfony · PHP + JS, API integrationsPRESTASHOP

Cosentino B2B/B2C · WordPress · modular customisable componentsWORDPRESS

Salud Savia · custom REST APIs, ElasticSearch back-end, custom WP plugins, eCommerce integrationREST · ES

VOILÁ PRODUCTORA WEB DEVELOPER · 2013 → 2019 EARLY CAREER

PHP, JavaScript, jQuery, NodeJS, Unity (.NET). Proprietary CMS platforms, a Google Maps routing app, multimedia content managers and a VR interactive game.

03 · Projects

shipping-orchestrator

DDD / SAAS · OPEN SOURCE

PERSONAL · .NET 10 MODULAR MONOLITH

Open-source reference architecture for a multi-tenant SaaS shipping platform. Domain-Driven Design with a CQRS read-side split (Operations vs Customer), Wolverine on AWS SQS + SNS for messaging and sagas, PostgreSQL (Aurora-compatible), connector pattern for Shopify / WooCommerce / PostNL, three deployable hosts (PublicApi, PrivateApi, Worker), full OpenTelemetry.

.NET 10 DDD CQRS WOLVERINE AWS SQS+SNS POSTGRESQL OTEL

VIEW REPO →

CarrierCostProcessor

MAERSK · FINOPS · LEAD DEVELOPER & ARCHITECT

Carrier cost ingestion service, 30+ carriers integrated and feeding 1M+ invoice lines a day. Lead developer and architect: designed the file-ingestion pipeline that pulls carrier cost files over FTP, with a builder pattern for plug-and-play onboarding of new carriers (including AI-assisted integrations). The Outbox pattern produces normalised cost events to Kafka under contracts governed by Schema Registry, consumed downstream by FinOps and Crucible. Full E2E + integration test scaffolding spins up automatically per carrier, so each new integration ships with its own safety net.

.NET AKS FTP BUILDER PATTERN OUTBOX KAFKA SCHEMA REGISTRY E2E TESTS AI ASSIST

Crucible

MAERSK · FINOPS · LEAD DEVELOPER & ARCHITECT

.NET 10 generic event-processing platform for FinOps. Lead developer and architect: replaced a 3-hour processing bottleneck with a 30-minute pipeline and, with the added visibility and monitoring it brought, cut support tickets by 50%. Designed the layered architecture on top of the existing FinOps patterns (Domain / Application / Infrastructure / Pipelines / Api / Worker), CQRS via mediator, EF Core code-first migrations, OpenTelemetry, and Testcontainers-backed E2E tests. First pipeline ingests VendorCost feeds from CarrierCostProcessor over Kafka and produces invoice-line records in the shared FinOps database, with per-field enrichment attribution, three-dimensional event status (processing / quality / business outcome) and full event lineage. Built generic enough to absorb future revenue and reconciliation pipelines.

.NET 10 CQRS KAFKA EF CORE OTEL TESTCONTAINERS FINOPS

04 · Stack

BACKEND

.NET 8/10 C# PHP Laravel Symfony NodeJS

EVENT-DRIVEN & INTEGRATION

Azure Service Bus Kafka AWS SQS / SNS Outbox Wolverine Quartz

DATA

PostgreSQL MSSQL ElasticSearch EF Core

CLOUD & OBSERVABILITY

Azure (AKS) Docker Kubernetes OpenTelemetry Grafana Loki Prometheus Tempo GoAlert

FRONTEND

React TypeScript JavaScript jQuery HTML / CSS

METHODOLOGY

DDD CQRS Saga Modular Monolith Agile / Scrum CI / CD

AI TOOLING

Claude Code GitHub Copilot

05 · Contact

DIRECT

EMAILsergiolinaresperalta@gmail.com

PHONE+34 622 76 16 36

LOCATIONMadrid, ES

STATUSOPEN TO OFFERS

LINKS

GITHUBsergiolinarescodes

SHOWCASEshipping-orchestrator

CVcv-en.pdf

LANGUAGES

Español · native English · professional

END OF FILE

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