Денис

DENYS VASYLENKO
Senior Software Engineer
Kyiv, Ukraine | [відкрити контакти](див. вище в блоці «контактна інформація») | [відкрити контакти](див. вище в блоці «контактна інформація») | [відкрити контакти](див. вище в блоці «контактна інформація»)
SUMMARY
• Senior Software Engineer with 7+ years building backend systems, cloud infrastructure, and data pipelines, including 5+ years
in aviation technology.
• Architected large-scale geospatial data ingestion and matching services, processing third-party and in-app tracking data at scale.
• Built real-time streaming pipelines with Amazon Kinesis and Apache Flink for event processing, sessionization, and spatial
enrichment.
• Established production observability (Datadog, CloudWatch, Slack alerting) and led Sev-1 incident response.
• Experienced technical mentor with a track record of cross-functional collaboration and stakeholder communication in agile
teams.
PROFESSIONAL EXPERIENCE
Senior Software Engineer — SkyPath Dec 2020 – Present
• Architected and built an end-to-end data ingestion and matching platform, reconciling third-party tracking data with in-app
session data using geospatial and temporal matching techniques to link independently-sourced records.
• Develop and optimize complex SQL queries involving multi-table joins, aggregations, window functions, and performance
tuning across Athena and PostgreSQL.
• Leverage SQL and Python for data processing, analysis, and automation to support analytics, reporting, dashboards, and
business intelligence initiatives.
• Developed production-grade streaming data pipelines using Amazon Kinesis Data Streams, Kinesis Data Firehose, and Apache
Flink, implementing real-time event processing, sessionization, spatial feature enrichment, and stream aggregations.
• Designed and implemented Deck.gl-based geospatial visualization web application capable of rendering millions of weather and
flight data points, enabling efficient exploration and debriefing of large-scale aviation datasets.
• Manage AWS infrastructure, including VPC, ECS, Lambda, and Kinesis.
• Built a data and analytics pipeline that powers dashboards, reports, and datasets used for machine learning.
• Implemented the production observability stack (Datadog, Checkly, Spike, CloudWatch, Slack alerting), improving incident
detection and response across the engineering team.
• Serve on 24/7 on-call rotation resolving Sev-1 production incidents, including database load spikes and deadlocks, typically
restoring service within 1 hour.
• Set up the onboarding process, mentored new developers, and reviewed their code.
• Presented new features and demos during company meetings.
Fullstack Developer — The Frontend Company Jan 2019 – Dec 2020
• Delivered full-stack and frontend features across three enterprise client projects as part of small agile teams (2–4 developers),
owning architecture decisions and direct client communication alongside design and backend teams.
• Built the Competency Development System, a role-based Angular 12 enterprise skill-assessment application with a reusable
component library, custom KendoUI design system, and NgRx state management for performance at scale.
• Developed a Shop Floor Management System, a real-time manufacturing analytics platform (Angular 8, NgRx, Ngx-Charts)
with custom, drag-and-drop dashboards and live data visualization.
• Built a full-stack e-commerce ordering and delivery platform (Angular, Node.js/Express, MongoDB, Elasticsearch) serving
1,000+ business clients with personalized, per-customer views.
• Conducted technical interviews for Angular frontend developer candidates.
SKILLS
Technical: TypeScript / NestJS / Fastify | JavaScript / Node.js | PostgreSQL / PostGIS | Redis | AWS (ECS Fargate, Lambda, API Gateway,
RDS, Kinesis, Athena, Glue, CloudWatch) | AWS CDK (IaC) | Docker | CI/CD (GitHub Actions) | Angular / NgRx | Geospatial Data
Processing (H3, PostGIS)
Professional: Backend Architecture & System Design | Cloud Infrastructure & DevOps | Production Reliability & Observability |
Technical Mentoring & Team Growth | Cross-Functional Collaboration | Stakeholder & Client Communication | Incident Response &
On-Call Ownership | Ownership & Accountability
EDUCATION
B.Sc. in Software Engineering — National University of Kyiv-Mohyla Academy
2016 – 2020
Bachelor's thesis: designed and developed an Alumni Portal for the Faculty of Informatics (Angular, Flask, Odoo CRM integration).
LANGUAGES
Ukrainian — Native | English — Upper-Intermediate (B2)