RL Classification Algorithm
Building and maintaining ReversingLabs classification backend. This is a high volume, event driven set of reliable services that classify billions of files.
PythonScyllaDBKafkaMQK8
Portfolio
Denis Mandic
Based in Europe: Zagreb, Croatia
Status: Happily Employed. Open to interesting opportunities.
I build thoughtful and resilient systems.
This site is a snapshot of my work: projects I'm proud of, experience across teams and products, and the skills I bring to new problems.
About
Leadership and Architecture
I’m a product oriented software engineer with 11+ years of experience building high–performance backend systems and developer–facing tools and APIs.
I lead teams that deliver classification algorithms, APIs, and public–facing websites, aligning technical work with business priorities.
I’m comfortable designing architecture, building new projects as well as maintaining legacy ones.
I have managed multiple engineering teams end–to–end, from recruitment to performance management.
The most recent project that I've led over the last four years is building secure.software and the surrounding infrastructure from the ground up.
Skills
PythonArchitectTechnology LeadershipDistributed SystemsEvent driven environmentMentoringCode reviewTeam LeadershipSystem designSLO-driven developmentMicroservicesDockerDocker SwarmKubernetesArgoCDRabbitMQKafkaMQScyllaDBKey-value storesClickHousePostgreSQLRelational databasesFlaskREST APIsOpenAPIGrafanaLinuxbashCentOSRockyOSJenkinsGitLab CIGithub ActionsArtifactoryHigh-volume processingExtract, transform, load
Strengths
- Led engineering teams bridging strategy and hands–on execution.
- Architectured, built and maintained SLO–driven, scalable, distributed ELT systems.
- Led cross-department projects spanning multiple teams and delivered on schedule.
Interests
- Designing simple and elegant backend systems and APIs.
- Building high–volume, high–performance services that handle large event streams and scale reliably.
- Improving developer experience, tooling, and automating repetitive work.
Projects
A small sample of work.
Distributed systems built for real-world impact.
Spectra Assure Community
We built secure.software, a platform for assessing and monitoring open-source packages and software supply-chain security. This was a greenfield project that I've led from its beginnning.
REST APIsMicroservicesQueues
Community User Accounts
When we were adding user accounts to secure.software, I researched best practices, defined recommended approaches with possible alternatives, build and present a POC and then quickly implemented it.
Auth0OAuth2.0ResearchPOC
Career Timeline
Professional Experience
Total Experience: 11 yrs 4 mos
2026
2025
2024
2023
Software Architect
ReversingLabs
Mar 2026 — Present3 mosTech leader driving system design and engineering direction. I define technical roadmaps, orchestrate how systems communicate across departments, enforce core engineering standards and lead high impact projects. My focus is enabling the organization to deliver scalable, reliable software by defining the architectural vision and contributing through hands-on implementation.Team Lead
ReversingLabs
Jan 2023 — Mar 20263 yrs 2 mosTech lead and people manager for two product oriented engineering teams: one building and maintaining the public secure.software site and another building core classification algorithms and APIs. Defining roadmaps, designing system architecture, and contributing hands-on to ensure delivery aligns with business goals. Managing people, conducting 1:1s, tracking goals and evaluating performance.Principal Software Engineer
ReversingLabs
Feb 2022 — Jan 202311 mosLed the Cloud Algorithms team: owned architecture and delivery of distiributed backend services. Collaborated with stakeholders to design scalable, reliable microservices and improve system observability. Responsibilities included both hiring to expand the team and people management.
Get in Touch
Open to exceptional opportunities
I'm currently focused on my role and not actively seeking new work. However, I'm always open to discussing full-time roles that offer significant growth, competitive compensation, and top-tier benefits. If you have a high-impact role in mind, I'd love to hear from you.