# Jeff Thierch

> Senior Software Developer | Software Engineer | Performance/Optimization Specialist | TypeScript | JavaScript | Python | Go | Java | SQL | Vue | React

Location: São Paulo, Brazil
Profile: https://flows.cv/jeffthierch

5+ years of professional experience in software development, system architecture, and technical leadership, working on high-impact enterprise and government systems:

- Strong experience as Tech Lead and Senior Full Stack Developer, leading teams, mentoring developers, and driving architectural decisions;

- Solid background in software architecture, system modernization, and performance optimization, with proven results in reducing operational costs and improving scalability;

- Extensive experience with ERP integrations (SAP, TOTVS, NETSUITE, OMIE), automating critical business processes and drastically reducing processing time;

- Hands-on experience with backend development using Node.js, Fastify, NestJS, AdonisJS, Express, message queues (RabbitMQ, BullMQ), and relational databases (MySQL, PostgreSQL, Sybase);

- Strong frontend expertise with Vue 2, Vue 3, Nuxt.js, React, Next.js, including the creation of proprietary component libraries and design systems focused on DX and UX;

- Experience working with legacy and large-scale government systems, including migration to modern cloud-based architectures;

- Solid knowledge of DevOps and observability, using Docker, AWS, CI/CD pipelines, Nginx, Git, and Sentry;

- Broad programming background across TypeScript, JavaScript, Python, Go, Java, Groovy, and PHP;

- Experience delivering complex solutions for enterprise clients such as Nissin Foods, Banco REAG, Venturus Institute, Audionova/Sonova, Enel Brasil and VERT Capital.

I am curious, adaptable, and easygoing, always open to new challenges. I strongly value clean architecture, developer experience, and continuous improvement. I enjoy collaborating with teams, mentoring developers, and turning complex technical problems into scalable and efficient solutions.

## Work Experience
### Technical Lead @ ZNAP Technologies
Jan 2024 – Present
Tech Lead & Architecture:

- Led high-complexity projects for enterprise clients including Nissin Foods, Banco REAG, Venturus Institute, Audionova/Sonova International, and VERT Capital.

- Defined and drove software architecture decisions, system design, and technical standards across backend and frontend.

- Actively mentored junior and mid-level developers, improving code quality, delivery speed, and team autonomy.

- Focused on Developer Experience (DX) and User Experience (UX), implementing design systems and standardized component libraries.

System Modernization & Performance:

- Led full-stack modernization initiatives, migrating Restify to Fastify, improving scalability, stability, and performance.

- Implemented message queues (RabbitMQ) and observability (Sentry), fixing memory leaks and critical performance bottlenecks.

- Migrated frontend architecture from Vue 2 to Vue 3, restructuring legacy codebases and significantly reducing bugs.

ERP & Enterprise Integrations:

- Led complex ERP integrations with SAP, TOTVS, NETSUITE, and OMIE, automating business-critical processes.

- At Banco REAG, reduced supplier registration and sales order processing time from 2–3 hours to under 4 minutes, enabling mass processing across 70 companies and reducing operational teams to just 2 people.

Key Technologies & Tools:
Node.js, TypeScript, JavaScript, Fastify, NestJS, Vue 2, Vue 3, React, RabbitMQ, MySQL, PostgreSQL, Docker, AWS, CI/CD, Git, Nginx, Sentry

### Senior Software Engineer @ ZNAP Technologies
Jan 2024 – Present

### CTO @ Thierch IT Solutions
Jan 2022 – Present | Ribeirão Preto e Região

### Software Engineer @ CSM BETHA - CENTRAL DE SOFTWARE
Jan 2024 – Jan 2024
- Worked on large-scale government legacy systems including budgeting, fleet management, healthcare, and public procurement.

- Maintained and optimized Java desktop systems using Sybase, complex SQL queries, and stored procedures.

- Participated in the migration of legacy systems to a modern cloud-based, web-oriented platform, improving maintainability and scalability.

Key Technologies & Tools:
Java, Sybase, SQL, Legacy Systems, Cloud Migration

### Software Engineer @ KS Gestão - Tecnologia e Negócios
Jan 2022 – Jan 2024
Responsável técnico pelo desenvolvimento do sistema de gestão de frotas, Saas de votações, Saas de Helpdesk e pela manutenção dos sistemas legados do principal cliente da KS.

Principais realizações:

- Realizar a migração de todos os componentes escritos em Vue que utilizavam a options api para composition api.

 - Criar testes de integração e unitários em todos os módulos do sistema, garantindo assim uma queda drástica na quantidade de novos tickets e uma maior segurança durante os processos desenvolvimento e deploy.

- Criar a documentação de uso de todos os módulos presentes no sistema de gestão de frota.

- Refatorar toda a camada de servidor, permitindo assim:
        - Reduzir a complexidade e acoplamento dos módulos.
       - Padronizar toda a arquitetura do sistema.
       - Aplicar os conceitos de clean code para tornar o código simples, organizado e de fácil compreensão.
       - Garantir a integridade das regras de negócio. 
       - Reduzir drasticamente a ocorrência de novos tickets, ocasionando em uma maior satisfação dos clientes com o projeto.

- Implementar sistema de cache e filas para diversos módulos do sistema, garantindo assim um menor tempo de acesso às informações e uma maior facilidade de escalonar a aplicação.

- Corrigir vazamentos de memória e aplicar diversas otimizações nos algoritmos, utilizando técnicas de profiling, reduzindo custos de manutenção do sistema.

- Criar e dar manutenção em libs proprietárias utilizadas pelos diversos sistemas da KS.

 - Criar diversos módulos novos conforme as necessidades especificadas pelos clientes.

- Aplicar os conceitos do atomic design para garantir a organização e simplificação dos componentes utilizados no front-end.

- Refatorar o design de estilização dos componentes do sistema garantindo a consistência das telas do sistema.

### Full-stack Developer @ Trybe
Jan 2021 – Jan 2022 | Ribeirão Preto e Região


## Education
### Bacharelado in Ciência da Computação
Estácio

### Full Stack Web Developer in Computer Science
Trybe


## Contact & Social
- LinkedIn: https://linkedin.com/in/jeffthierch
- GitHub: https://github.com/JeffThierch
- Portfolio: https://jeffthierch.github.io/

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Source: https://flows.cv/jeffthierch
JSON Resume: https://flows.cv/jeffthierch/resume.json
Last updated: 2026-03-30