Featured · Active product
CRM for 3D Printing
A workflow-focused CRM for turning incoming requests into confirmed production orders — with roles, status flow and file handling.
Senior backend engineer · C++ / Go
Yaroslav Karunnyi
I design and build MVPs, reliable backend systems, internal tools and automation solutions using C++ and Go.
I help turn ambiguous business requirements into clear workflows, maintainable architecture and working software.
8+ years in commercial development.
Selected Work
Systems built around real workflows
Four projects that show product thinking, backend architecture and pragmatic delivery at different stages of maturity.
Completed product
NoteMe
Working Telegram notes bot — first version shipped; capture, search and reminders while the product continues to evolve.
Engineering tool
Agentflow
CLI workflow tool for iterative AI-assisted development with human gates, checkpoints and constrained change sets.
Learning project
GophKeeper
Secure secrets vault with a gRPC server, CLI client, TLS/JWT and structured plus blob storage.
Active product · In development · 2026
CRM for 3D Printing
A workflow-focused CRM that turns incoming requests into confirmed production orders while keeping human review in the decision loop.
Role
Product designer, system architect and backend developer.
Highlights
- Models the path from inbound email to a manager-confirmed order.
- Separates roles, status workflow, files and integration boundaries.
- Core flow is implemented; the archive and STL pipeline is awaiting pilot acceptance.
Technologies
Completed product · Shipped · 2025–2026
NoteMe
A Telegram notes bot designed for low-friction capture, retrieval and timely reminders.
Role
Product designer, backend developer, deployment and operations.
Highlights
- Captures notes from ordinary Telegram messages.
- Supports full-text search, reminders and time zones.
- First version is live while the product continues to evolve.
Technologies
Engineering tool · In development · 2026
Agentflow
A CLI workflow for keeping iterative AI-assisted development controlled, reviewable and recoverable.
Role
Product and workflow designer, system architect and Go developer.
Highlights
- Structures architecture, implementation, checks and remediation stages.
- Adds human gates, checkpoints and rollback controls.
- Produces reviewable run artifacts and diagnostics.
Technologies
Learning project · Completed · 2026
GophKeeper
A team learning project exploring secure client-server storage and synchronisation in Go.
Role
Go developer in a team learning project.
Highlights
- Uses a gRPC server and CLI client over TLS with JWT authentication.
- Combines PostgreSQL, MinIO and local SQLite storage.
- Covers client sync, conflict handling and integration tests.
Technologies
How I can help
From a product idea to a reliable working system
Bring an idea, a manual workflow or a technical bottleneck. I can help define the right scope, make the system understandable and deliver software that is ready for real use.
MVP development
Turn an idea or an existing manual process into a focused first product version. I help define the core workflow, cut unnecessary scope, design the architecture, build the backend and integrations, and prepare the product for launch.
- Product scope and core user workflow
- Data model, architecture and delivery plan
- Backend, integrations and launch-ready first release
Backend systems
Design and implementation of backend components in C++ and Go for products with real operational complexity.
- REST and gRPC APIs
- Background processing and data flows
- Service and storage boundaries
Automation & internal tools
Replace repetitive manual work with clear workflows and maintainable tools built around how the business actually operates.
- Email, Telegram and external API integrations
- Internal dashboards and operational tools
- Parsers, notifications and scheduled workflows
Performance & reliability
Investigate bottlenecks and production behaviour, then turn the findings into practical engineering improvements.
- CPU, memory and latency profiling
- Concurrency and failure investigation
- Metrics, observability and operational constraints
Engineering background
Production experience behind every delivery
More than eight years of commercial engineering inform how I scope work, design systems and make trade-offs after the first release.
8+ years
Core C++ engineering
Commercial systems where concurrency, networking, data processing and predictable performance matter.
Production
Operational ownership
Incident investigation, profiling, metrics and maintainability shaped by supporting software beyond initial delivery.
Backend
Go and distributed systems
Services, APIs, persistence and integrations with explicit boundaries and practical failure handling.
Product
Architecture and collaboration
Turning ambiguous requirements into workflows, system decisions and delivery steps shared with technical and business stakeholders.
Core expertise
A systems toolkit, grouped by the problems it solves
No arbitrary proficiency scores — just the technologies and engineering practices I use to design, deliver and support software.
Languages
- C++ 11–20
- Go
- Python
Backend & systems
- Concurrency
- Networking
- REST / gRPC
- Distributed systems
- Performance analysis
Data & infrastructure
- PostgreSQL
- Redis
- Linux
- Docker
- Metrics
Engineering practices
- System design
- Code review
- Testing
- CI/CD
- Observability
Current focus
What I am working on now
- Product deliveryBuilding the first operational version of the CRM for a 3D-printing workflow.
- Systems engineeringDeepening low-latency C++ and performance investigation practices.
- ArchitectureImproving how product requirements become explicit system boundaries and delivery plans.
- AI-assisted developmentExperimenting with controlled workflows, human gates and reviewable artifacts.
Start a conversation
Have an idea, a manual process or a system bottleneck?
Send me a short description of the context, what should change and where you are now. I will reply with the questions needed to define a practical next step.
Open to selected freelance and product collaborations.