Senior Software Engineer
maya.hartmann@example.com+49 30 1234 5678Berlin, Germanymayahartmann.devlinkedin.com/in/mayahartmanngithub.com/mayah
Summary
Senior engineer with 9 years building reliable distributed systems at scale. Led the migration of a 50M-user platform from a monolith to event-driven services, cutting p95 latency by 40%. Comfortable across the stack — TypeScript, Go, Postgres, Kafka — and equally comfortable mentoring a five-person team.
Experience
Senior Software Engineer
Lumen HealthBerlin, Germany
Patient-data platform for European hospital networks; HIPAA + GDPR.
- Led the re-architecture of the records ingestion pipeline from REST polling to a Kafka-based event stream, processing 12k events/sec at peak and reducing data freshness from 5 min to under 8 sec.
- Designed and shipped a regional data-residency layer that lets each hospital network choose where its data lives — unblocked three enterprise deals worth €4.2M ARR.
- Mentored four engineers from mid to senior; two became tech leads within 18 months.
- Owned the 24/7 on-call rotation; cut sev-1 incidents 60% YoY by adding synthetic monitoring and a load-shedding circuit breaker.
TypeScriptGoKafkaPostgresKubernetesTerraform
Software Engineer → Senior Software Engineer
Trail AnalyticsLondon, UK (Remote)(remote)
Product analytics SaaS, ~$30M ARR at exit.
- Built the real-time funnel-analysis query engine on top of ClickHouse, dropping median dashboard load from 8s to 600ms.
- Migrated the React SPA to Next.js (SSR + ISR), improving LCP from 3.1s to 1.4s and lifting trial-to-paid conversion by 14%.
- Drove adoption of an internal RFC process — 28 RFCs in the first year, halving rework on cross-team initiatives.
TypeScriptReactNext.jsClickHousePythonAWS
Backend Engineer
NorthboundStockholm, Sweden
Logistics SaaS for Scandinavian retailers.
- Wrote the routing optimizer (mixed-integer LP) that scheduled 3M+ daily deliveries; saved customers an estimated 12% on fleet costs.
- Designed the public REST + webhook API now used by 200+ integration partners.
PythonPostgresRedisDocker
Education
MSc Computer Science
ETH ZürichZürich, Switzerland
- Thesis: "Consistency Models for Geo-Replicated Event Stores" — published at EuroSys '17.
- Graduated with distinction (top 5% of cohort).
BSc Computer Science
TU BerlinBerlin, Germany
- Summa cum laude.
Skills
- Languages
- TypeScript · Go · Python · Rust · SQL
- Infrastructure
- Kubernetes · Terraform · AWS · GCP · Kafka · ClickHouse
- Practice
- Distributed systems · Event-driven architecture · On-call leadership · Mentoring · Technical writing
Languages
- GermanNative
- EnglishC2
- SwedishB2
- FrenchB1
Certifications
AWS Certified Solutions Architect — Professional
Amazon Web Services
Certified Kubernetes Administrator (CKA)
Cloud Native Computing Foundation
Projects
lighthouse-saasgithub.com/mayah/lighthouse-saas
Open-source uptime + page-speed monitor. 4.2k GitHub stars, 80+ contributors.
- Designed the multi-region probe scheduler; runs ~500k checks/day with 99.95% delivery.
TypeScriptPlanetScaleCloudflare Workers
Awards
Code in Place — guest lecturer — Stanford University2023
Invited to give the closing lecture on systems design (~5k students).
Publications
- Consistency Models for Geo-Replicated Event Stores — EuroSys '172017
Hartmann, M., Sato, K., Brown, R.
Speaking
Scaling Postgres past 10TB without panicking
PostgresConf EU
Berlin — 600+ attendees, recording on YouTube.
Why we left RabbitMQ for Kafka
Berlin Backend Meetup