Framer Motion — Keiven Marques

Senior Software Engineer / Lisbon, Portugal

Elastic editorial

01 — 04Portugal's corporate tax system

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01 / Approach

Java · Spring Framework · Backend & web applications

Senior software engineer with more than six years at Opensoft, developing and maintaining public-sector web services and applications. Works with Java, Kotlin and Spring, with experience in tax business rules, relational data modelling, performance troubleshooting and production support.

02 / Professional experience

Built in practice.

Senior Software Engineer

Opensoft

October 2019 - February 2026 / Portugal

Developed and maintained Java/Spring web services and applications for public-sector systems, including IRC and the IHRU housing programme.
Implemented tax business rules and maintained applications including DMR, SIRE and Divergências.
Designed Oracle and IBM Db2 tables and relationships to support application data persistence.
Investigated production incidents and performance bottlenecks through monitoring and troubleshooting; provided technical support to restore service reliability.
Worked with product managers, designers and QA to translate business requirements into technical solutions.
Maintained secure infrastructure and contributed to development and maintenance process improvements while delivering against project requirements and deadlines.

03 / Experience in practice