Valeriy Selitskiy
General Info
- Residence: Kraków, Poland, EU
- Time Zone: CET
- Work Preferences: Fully Remote, Employment Contract, B2B Contract
- Languages: English, Belarusian, Russian
Contact Information
- LinkedIn: linkedin.com/in/wavecut
- GitHub: github.com/iamwavecut
- Telegram: t.me/WaveCut

Summary
A highly experienced backend developer transitioning into the GenAI field, bringing a proven track record in delivering high-quality, scalable solutions in diverse industries. Seeking a leadership role where deep technical expertise in LLMs and diffusion models can drive innovation and impact.
Tech & Skills
Frameworks & Languages:
- Go: Buf, Gin, Echo, Fiber (+ fasthttp), sqlc
- Python: FastAPI, Pytorch, HF: Transformers, Diffusers
- PHP: Laravel, Symfony, Doctrine
- JS: Vanilla, React + TypeScript
Environments:
- AWS, GCP, Kubernetes, Docker, LAMP/LEMP, bare metal
CI/CD:
- GitHub Workflows, GitLab Pipelines, Jenkins, Bitbucket pipelines, ArgoCD
DBMS:
- PostgreSQL, MySQL, SQLite, MS SQL Server, MongoDB, Clickhouse, Redis
Soft Skills:
- Adaptability, collaborative mindset, effective communication, problem-solving, receptiveness to feedback, respect for diversity, social intelligence, and a safety-first approach.
Goals and interests
Looking for a position to lean from purely backend SWE career path into ML/AI related. I created a pet project that features:
- Using LLMs, both proprietary and open-source that include but not limited to fine-tuning, local inference, quantization, runtime optimization.
- Huggingface transformers
- llama.cpp GGUF, exllamav2, AQLM, bitsandbytes, quanto
- OpenAI GPT4; Anthropic Claude; Google Gemini; Mistral; Groq
- Diffusion models, such as SD, SDXL, Flux: fine-tuning, local inference, runtime optimization.
- Huggingface diffusers
- xformers / SDPA; torch.compile
- HyperSD optimized inference
- Using LangChain and other tools to build complex agentic workflows
- I love the FOSS community and always willing to contribute.
- I am interested in a transition to a higher-level leadership position, as my extensive and comprehensive technical expertise has the potential to yield greater impact than mere coding time.
Spotlight
Plotva: A free-to-use Telegram chatbot leveraging local LLM inference for privacy-first, realistic interactions, integrating cutting-edge diffusion models for image generation.
Key features:
- MAU: 20,000+
- Local LLM / DiT inference
- Committed to not storing user data besides operational needs (operational history, long-term memory)
- Realistic and humorous responses to messages via accurate prompting and workflows
- Image generation based on text prompts, diffusion models: SD, SDXL, Flux, Sana
- Translation of texts from foreign languages (both local inference and API based)
- And more, constantly improving.
Plotva uses advanced algorithms to determine the optimal frequency of interaction, maintaining a casual atmosphere in chats. The bot easily integrates into group conversations and is available for personal communication.
The project is developed as a non-commercial initiative, open to user suggestions for functionality improvements.
Experience
Independent Contributor (B2B Contract)
– Present
- Development and maintenance of various applications using Go, Python, and PHP.
- Seamless integration of new features across diverse platforms -- Agile methodologies, cross-functional collaboration.
- 99.99% uptime achieved for mission-critical systems -- Best engineering practices, continuous monitoring.
Senior Golang Engineer @ Unity
–
- 25% latency reduction in B2B client's system -- Microservices optimization, Go.
- 30% reliability improvement -- Distributed systems design, error handling strategies.
Backend Software Engineer @ Lyft
–
AWS, Kubernetes, Microservices, PostgreSQL, DynamoDB, Go, Python, TypeScript
- Lead the development of search-related services and operations tooling within the Mapping division.
- Participated in the optimization of the data ingestion and ETL pipeline, which, when combined with other efforts, resulted in operational cost reductions exceeding $10 million.
- Maintained and improved public points-of-interest geospatial search APIs.
- Provided mentorship and coaching to team members transitioning to the Go programming language.
- Contributed to the development of technical specifications, solution architecture, and design reviews.
Senior Software Engineer @ SoftSwiss
–
Kubernetes, NATS, ZeroMQ, RabbitMQ, PostgreSQL, Go
- Design and built real-time low latency services for the sports betting industry.
- Bare-metal Kubernetes setup and deployment.
- Integration with many third-party supply and demand providers.
Senior Software Engineer @ VIV Dev
–
AWS, Docker/ECS, Go, Python, Node.js, JavaScript
- Developed architecture for a mobile longevity coaching application
- Built backend services, implemented testing protocols, and managed deployments
- Established CI/CD pipelines and monitoring systems
Senior PHP Developer @ Rakuten Viber, Minsk
–
LEMP, PHP, MySQL, API
- Developed and maintained private and public APIs for key projects including Viber Out, Sticker Market, and Viber Wallet.
- Utilized LEMP stack with Symfony 2.8, MySQL 5.7, Memcached, GitLab, and Jenkins
Earlier Positions
- Lead Web Developer at Alutech (September 2012 - October 2013)
- Senior Web Developer, Team Lead at Admirals (August 2010 - September 2012)
- JS/C# Developer at Stylesoft (December 2008 - May 2010)
- PHP Developer at Seobility (May 2008 - December 2008)
- Web Developer at Minsk City Executive Committee IT Center (July 2005 - May 2008)
See more examples of my experience on LinkedIn.