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Simonas JaceviciusSJ

Simonas Jacevicius

SOFTWARE DEVELOPER

€150/day
Málaga, ES
0-2 years

Average response time: 1 hour

About Simonas

I specialise in developing Backend / Full-Stack SaaS platforms, scalable web
applications, and AI-powered systems. Experienced building
multi-tenant backend architectures, Stripe subscription workflows, and
automation tools using OpenAI APIs. Strong understanding of REST APIs,
PostgreSQL, backend service design, and modern development workflows.

Tech Stack:


AI & Data: AI solutions, OpenAI, Langchain, Web Scraping.

Frontend: Javascript, ReactJS, NextJS, Tailwind.

Backend: Supabase, NodeJS, API REST, Thymeleaf, Spring Boot, Spring Security.

Integrations and APIs: Google Cloud, Firebase, Stripe.

Infrastructure: NoSQL, SQL, Netlify, Docker.
  • English

    Native or bilingual

  • Spanish

    Conversational

  • Lithuanian

    Native or bilingual

Can work on-site
Málaga (up to 20km)

Experience

  • www.contentpeaks.com
    CO-FOUNDER & BACKEND DEVELOPER
    September 2025 - Today (9 months)
    Designed and implemented a multi-tenant SaaS backend architecture
    using PostgreSQL with role-based access control and transactional
    workflows.
    Developed backend services and automation systems using
    TypeScript, Supabase, and Edge Functions.
    Integrated Stripe subscription billing, webhook handling, and
    automated customer lifecycle management.
    Built AI-powered workflows using OpenAI APIs and SERP data
    providers for content automation and SEO-related systems.
    Implemented scheduled background jobs and cron-based processing
    for automated platform operations.
    Worked across backend architecture, API integrations, database
    design, and cloud-based deployment workflows.
    Typescript artificial intelligence
  • (JAVA & SPRING BOOT)
    JUNIOR SOFTWARE DEVELOPER
    September 2024 - Today (1 year and 9 months)
    Developed REST APIs using Spring Boot and PostgreSQL for
    backend business systems.
    Designed layered application architecture using controllers, services,
    repositories, and DTO separation.
    Applied dependency injection, transactional service design, and
    clean architecture principles.
    Wrote unit tests using JUnit and Mockito to validate business logic
    and improve reliability.
    Containerized backend applications using Docker for deployment
    consistency and scalability.
    Collaborated on backend feature development and API integration
    workflows.
  • Situation Research and Insight
    MARKET RESEARCH AND DATA ANALYST
    December 2021 - November 2024 (2 years and 11 months)
    Conducted data analysis and reporting in a remote international environment, developing analytical and problem-solving skills relevant to backend development.

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Education

  • PROFESSIONAL BACHELOR (EQF LEVEL 6)
    Kaunas University of Applied Sciences
    2020
    PROFESSIONAL BACHELOR (EQF LEVEL 6)
  • AgileProjectManagement
    Coursera.
    2023
    AgileProjectManagement

Skill set

Categories