Open to opportunities

josv me

@josvme

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Software engineer and software architect building reliable distributed systems and developer platforms.

Germany

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What I'm looking for

I’m looking for a role where I can own architecture and build distributed, cloud-native systems—scaling high-throughput services—while collaborating in an agile culture and mentoring teams to ship reliable outcomes.

I’m a software engineer with over 10 years of industry experience, focused on software architecture, distributed systems, and agile development practices. I’m passionate about building elegant, cloud-native systems and sharing knowledge through mentoring and engineering guidelines.

Most recently as a Software Architecture Expert at Kaufland E-Commerce GmbH, I built and maintained central email and IAM platforms, owned reliability and on-call responsibilities, and helped teams send emails via APIs. I delivered high-scale services (including Go/gRPC workloads over 2K+ RPS) and improved business outcomes like conversion rate (+20%+) and ad revenue (about +3%), while modernizing a 5M+ LOC monolith through platform tooling, safer refactoring automation, and cross-team RFC leadership. Earlier roles include introducing Backstage as an internal developer platform, building ML-backed search APIs and ML services, improving indexing performance with Node.js streaming architecture (about 30x faster and ~20x fewer resources), and contributing to kernel/security work at scale in AIX and C performance tooling.

Experience

Work history, roles, and key accomplishments

Current

Software Architecture Expert

Current

Kaufland E-Commerce GmbH

Jan 2023 - Present (3 years 5 months)

Built and maintained the central email and IAM platforms with reliable on-call operations, enabling teams to send emails via APIs. Delivered high-throughput sponsored ads (2K+ RPS, ~100ms P99, +20% conversion) and product recommendations (500 RPS, ~150ms P99) while improving performance by 20% and ad revenue by ~3%.

Go gRPC Kafka Kubernetes Docker TypeScript Datadog OpenTelemetry

Technical Product Owner

Kaufland E-Commerce GmbH

Jan 2022 - Jan 2023 (1 year)

Launched Backstage as the internal developer platform, integrating 200+ services into the software catalog and enriching catalog metadata with ownership, monitoring, deployment, and dependency data. Led modularization and tooling to visualize coupling and enforce ownership, increasing ownership coverage from ~2% to 70%+.

Backstage Gitlab Datadog Vault SSO Python BigQuery Workflow Automation Architecture Governance

Senior Software Developer

Kaufland E-Commerce GmbH

Jan 2020 - Jan 2022 (2 years)

Built and maintained a Search REST API handling 4K+ RPS at peak with ~400ms P95 latency, including Python ML services for query analysis and reranking. Rebuilt the product indexing pipeline as a Node.js microservice, achieving ~30x performance improvement and ~20x resource reduction, and supported search relevance tuning with BigQuery + Pandas.

REST APIs Python Machine Learning Elasticsearch GCP Terraform Ansible BigQuery Pandas

Software Developer

Tradebyte Software GmbH (Zalando)

Jan 2017 - Jan 2020 (3 years)

Implemented a Python microservice to export product feeds to marketplaces, replacing PHP monolith functionality and reducing turnaround time by ~10x. Architected an event-based exporter using CDC and streaming SQL for near real-time catalog and inventory updates, and improved the PHP monolith’s quality and maintainability.

Python PHP CDC Streaming SQL MySQL Event Driven Architecture Performance Optimization

Research Assistant

Fraunhofer SIT

Jan 2014 - Jan 2017 (3 years)

Developed static and runtime Android analysis to detect hard-coded cryptographic keys and faulty SSL implementations, uncovering hard-coded keys in ~17% of the top 2000 Android apps in Germany. Designed actor-model runtime analysis to parallelize network/syscall/API inspection and built an obfuscation-level measurement algorithm.

Static Analysis Cryptographic Key Detection De Obfuscation Constant Propagation

Software Developer

IBM India Software Labs

Jan 2012 - Jan 2014 (2 years)

Contributed to maintenance of the AIX kernel implementation of role-based access control and supported trustchk. Developed and maintained performance monitoring tools and kernel extensions, including C-based perfstat and utilities such as nmon and IOSTAT.

C Role Based Access Control Kernel Extensions Performance Monitoring Iostat Systems Programming Trustchk