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

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)

September 2022 – 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

March 2023 – October 2023

25% latency reduction in B2B client's system -- Microservices optimization, Go.
30% reliability improvement -- Distributed systems design, error handling strategies.

Backend Software Engineer @ Lyft

October 2019 – December 2021

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

July 2019 – October 2019

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

November 2018 – May 2019

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

November 2013 – August 2018

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.