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Software Engineering & Consulting

Architecting Resilient Backend & AI Systems

Software engineering consulting and system architecture based in Andorra. Design, scalability, and reliability for distributed financial platforms, payment integrations, and AI-enabled automated architectures.

Origin & Philosophy

Solid Kiss SLU (Andorra) originated in 2022 by rebranding the Latvian company Yagni IK. The renaming reflects a strategic evolution in architectural philosophy. While the predecessor was conceived as a lean, short-term entity named after the software principle YAGNI ("You Aren't Gonna Need It"), the transition to Solid Kiss demonstrates a permanent commitment to long-term software design maturity, combining the structural integrity of SOLID design principles with the pragmatic efficiency of the KISS ("Keep It Simple, Stupid") methodology.

Founder Profile

Professional history, philosophy, and personal background.

Lion Kozlinsky

Lion Kozlinsky

Lead Backend Architect

Andorra | Citizen of Latvia

solid.kiss.it@gmail.com

Download Resume GitHub

Biography & Experience

Highly analytical software engineer with 15 years of experience constructing high-availability backend microservices, transactional networks, and financial payment platforms. Currently focusing on the implementation of modern AI-enabled engineering workflows, prompt engineering frameworks, and data retrieval systems (RAG).

Education & Certifications

  • 2026
    Google AI Certification

    Advanced models and engineering paradigms.

  • 2026
    Google IT Automation with Python Certification

    Configuration management, script infrastructure, and scaling.

  • 2021
    Event Sourcing Conference

    Advanced patterns in distributed state management and event-driven data flow.

  • 2020
    Domain-Driven Design Europe (DDD Europe)

    Software modeling, Strategic Design (Bounded Contexts), Event-Driven Architecture, Event Storming, and safe legacy monolith refactoring.

  • 2011 - 2014
    MSc in IT Management

    Transport and Telecommunication Institute, Riga.

  • 2006 - 2011
    BSc in Computer Sciences

    Transport and Telecommunication Institute, Riga.

Work Style & Philosophy

Software development is an optimization problem. Every process, architecture, and decision should ultimately be evaluated by a single metric: efficiency.

Direct and transparent communication is the most effective form of collaboration. Clear feedback, constructive disagreement, and open discussion produce better decisions than consensus driven by hierarchy or politics.

The best ideas should win regardless of their source. Strong engineering cultures minimize ego and maximize objective decision-making, allowing technical merit to take precedence over individual ownership.

Team success is the only success that matters. Removing blockers, sharing knowledge, and helping teammates are not acts of individual contribution—they are investments in the team's ability to deliver value.

Individual performance should be measured primarily by its impact on the team's outcomes. External competition between teammates creates local optimization; shared ownership creates sustainable, high-performing engineering organizations.

Interests & Hobbies

Avid reading and exploring literature. Regular travel to expand technical and cultural perspectives.

Core Competencies

A specialized service suite tailored for high-availability, scalability, and automated efficiency.

Code Architecture

Tactical-level Domain-Driven Design (DDD) patterns, layered software architectures, SOLID principles, and design patterns targeting testability and long-term codebase maintainability.

System Architecture

Strategic-level Domain-Driven Design (DDD). Structural engineering of distributed systems, multi-service communications, message brokers (Kafka, RabbitMQ), and caching strategies.

AI & LLM Integration

Implementation of state-of-the-art Retrieval-Augmented Generation (RAG) architectures, LLM pipelines, and automated processes to optimize business operations.

Payment & Financial Systems

Secure integration of multi-currency payment providers, money transfer gateways, and transactional services compliant with international regulatory standards.

Leadership & Process Delivery

Organization of development workflows, technical hiring pipelines, engineer mentoring, regular performance evaluations, and alignment of engineering capabilities with strategic business goals.

Legacy Refactoring

Modernization of obsolete codebases, migration to modern microservice patterns (CQRS, Event Sourcing, DDD), and significant technical debt reductions.

Clients & Projects

A record of design, architecture, and engineering work delivered to global organizations.

First Prudential Markets

Oct 2024 – Apr 2026 | Financial Brokerage

Architecture and development of a custom financial payment service handling money transfers across 6 trading platforms. Integrated 30+ payment providers, coordinated a core engineering team of 7 specialists, and ensured full regulatory alignment.

PHPSymfonyArchitecturePayments
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Aramis Censio

Dec 2023 – Sep 2024 | Diamond Trading Analytics

Design and engineering of web-based diamond valuation software and real-time online bidding analyzers utilized in state-level tenders. Delivered full analytical and pricing systems.

PHPLaravelWebSocketsAuctions
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Stickcredit

Sep 2022 – Nov 2023 | Digital Consumer Lending

Development of a secure, automated consumer lending engine integrated with credit rating bureaus, national registers, and payment processing nodes to facilitate instant scoring.

PHPSymfonyAPI IntegrationFintech
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OrangeSky / Sun Finance

Nov 2021 – Jul 2022 | Micro-Lending Networks

Design of authorization mechanisms and microservice modules. Configured and unified security rules across multiple web apps hosted on Azure and AWS cloud environments.

AzureAWSMicroservicesSecurity
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Printify

Sep 2020 – Nov 2021 | E-commerce Logistics

Connected and consolidated approximately 20 external print manufacturer APIs into the core e-commerce dispatch system, reducing automated onboarding times by 80%.

PHPREST APIAutomationScalability
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IET

Apr 2013 – Jul 2020 | High-Load Affiliate Systems

Maintained, optimized, and modernized a high-volume affiliate marketing platform (DoAffiliate.net). Created cargo registry logs and database structures for maritime shipping.

PHPMySQLAffiliate TechLogistics
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