Vasyl

VASYL OSYPCHUK
Senior Go Software Engineer
Building software that becomes easier to change.
Kyiv, Ukraine · Remote · [відкрити контакти](див. вище в блоці «контактна інформація») · [відкрити контакти](див. вище в блоці «контактна інформація») · LinkedIn · GitHub
PROFESSIONAL SUMMARY
Senior Go engineer with 10+ years of experience simplifying backend and distributed systems across healthcare, cloud infrastructure, observability, communications, and SaaS. I modernize architectures, remove fragile dependencies, and improve production performance. My preferred stack is Go, PostgreSQL, and Redis; my broader focus is software that stays understandable, maintainable, and easy to change.
ENGINEERING DECISIONS
SmithRx · Brought critical functionality in-house
Migrated a mission-critical capability from a complex third-party component to internally owned Go services, improving engineering control and long-term maintainability.
Mailtrap · Increased throughput by 15%
Identified production bottlenecks and increased backend throughput by 15% without increasing resource consumption.
InsightCat · Removed an authentication bottleneck
Replaced synchronous authentication calls with distributed authorization caches synchronized through Redis Pub/Sub, simplifying the architecture and removing a scaling bottleneck.
CloudSimple · Made long-running cloud operations reliable
Designed a distributed task scheduler for private-cloud provisioning and lifecycle operations within a platform later acquired by Google.
SlateUp · Used microservices where they solved a real problem
Decomposed a websocket-heavy monolith into independently deployable services, improving deployment reliability and enabling horizontal scaling.

PROFESSIONAL EXPERIENCE
SmithRx · Senior Software Engineer · 11/2023 – Present
Employer healthcare benefits platform. Migrating a critical third-party component to an internally owned solution; developing Go services and synchronization mechanisms across distributed components.
Mailtrap · Senior Go Engineer · 08/2022 – 11/2023
Email delivery SaaS. Improved backend performance and Terraform-based infrastructure automation for production email delivery.
InsightCat · Senior Software Engineer · 12/2020 – 08/2022
Built telemetry pipelines processing hundreds of gigabytes of logs and metrics per day with Go, ClickHouse, VictoriaMetrics, Redis, and gRPC.
CloudSimple · Software Engineer · 08/2017 – 12/2020
Built private-cloud provisioning and lifecycle systems, including reliable execution of distributed long-running operations. Acquired by Google.
SlateUp · Software Engineer · 09/2016 – 08/2017
Modernized a websocket-heavy monolith into independently deployable services for horizontal scaling and more reliable deployments.

EARLIER EXPERIENCE
WalaHub · Go Engineer, Freelance · 06/2016 – 11/2016
Replaced commercial routing APIs with OpenStreetMap-based routing, reducing vendor dependency and cost.
PaulCamper · Go Software Engineer · 01/2016 – 07/2016
Built Go microservices for profiles and authentication; developed SQL analytics in a mature CI/CD environment.
Hotels24 · Software Engineer · 08/2015 – 12/2015
Introduced Go and built internal analytics tooling with MongoDB and JavaScript.
Davintoo · Software Engineer · 04/2015 – 08/2015
Developed a monolithic PHP/JavaScript e-learning application.
1C · Software Engineer · 11/2014 – 04/2015
Developed SQL reporting and adapted business functionality after transitioning from laboratory work.

TECHNICAL EXPERTISE
Backend: Go · REST · gRPC · Distributed Systems · Microservices · WebSockets · Authentication
Data: PostgreSQL · SQL · Redis · MongoDB · ClickHouse · VictoriaMetrics
Infrastructure: Docker · Kubernetes · Terraform · Linux · CI/CD · Observability
Web: JavaScript · TypeScript · HTMX · HTML/CSS

INDEPENDENT ENGINEERING
BaptizedDragon · Founder & Software Engineer
Independent software practice focused on designing and building lean software systems for real businesses.
I apply lessons learned from a decade of working with distributed systems and microservices to smaller products: start with the simplest architecture that solves the problem, keep operational overhead low, and introduce complexity only when the product genuinely requires it.
Focus: Go · PostgreSQL · Redis · HTMX · End-to-End Product Development

EDUCATION
Domuni University · Bachelor's Studies in Philosophy · Ongoing
Bogomolets National Medical University (BNMU) · Specialist Degree, Sanitary and Hygienic Faculty · 2012