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Jakub – React, Node.js, Java, experts in Lemon.io

Jakub

From Poland (UTC+2)flag

Full-stack Web Developer|Strong senior
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Jakub – React, Node.js, Java

Jakub is a strong senior full-stack engineer with deep expertise in React, Node.js, Next.js, TypeScript, and AWS, demonstrated across fintech, telecom, industrial, and compliance domains. He has led architecture and end-to-end delivery of distributed systems, emphasizing event-driven design, microservices, and secure cloud infrastructure. Screenings confirm clear communication, client-facing experience, and strong ownership of technical decisions. He is recommended for senior roles requiring both technical depth and stakeholder engagement.

18 years of commercial experience in
Accounting
Administration
AI
Automotive
Banking
Cloud computing
Customer support
Gambling
Healthcare
Legal tech
Logistics
Management
Networking
Telecommunications
B2B
B2B2C
Customer support software
Main technologies
React
15 years
Node.js
15 years
Java
8 years
Spring
8 years
Next.js
5 years
Typescript
8 years
AWS
8 years
Additional skills
Azure DevOps
Vue.js
Jest
Playwright
CI/CD
Microsoft Azure
Prisma
Cypress
.NET
Angular
Kubernetes
PostgreSQL
ETL
Spring Boot
Heroku
IoT
MongoDB
AWS Lambda
Amazon S3
Amazon SNS
Amazon SQS
Amazon EC2
CloudWatch
Amazon RDS
Amazon Cognito
Direct hire
Possible
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Experience Highlights

CTO / Solution Architect / Tech Lead
Dec 2017 - Ongoing8 years 2 months
Project Overview

Led technical strategy and architecture across multiple enterprise and SaaS engagements delivered through a consulting/software house environment. Projects spanned telecommunications platforms, industrial SaaS systems, and enterprise workflow extensions.

  • Multi-channel telecommunications backoffice platform (SMS, voice, WhatsApp, email)
  • Industrial digital platform with subscription billing (Stripe), workflow automation, and Kubernetes-based deployment
  • Jira Service Management enterprise plugin extending core workflows
Responsibilities:
  • Defined company-level technical strategy and architectural standards;
  • Led backend architecture using Java (Spring, Quarkus) and Node.js;
  • Oversaw frontend architecture using React and Vue.js;
  • Designed cloud infrastructure and CI/CD pipelines (Azure, Kubernetes, GitHub/GitLab);
  • Established coding standards and conducted architectural reviews;
  • Mentored engineers and reviewed pull requests;
  • Coordinated delivery across multiple product teams and stakeholders;
  • Drove performance optimization and scalability improvements.
Project Tech stack:
React
Node.js
Java
Spring
Typescript
AWS
Microsoft Azure
Solution Architect & Senior Full-stack Developer
May 2021 - Feb 20264 years 8 months
Project Overview

A cloud-based regulatory compliance platform developed for gambling operators to manage player-related documentation, compliance workflows, and reporting obligations. The system automates document processing, identity verification workflows, and structured compliance reporting in line with industry regulations. It integrated OCR technology for extracting data from documents and supported dynamic PDF generation for regulatory documentation. The platform also included monitoring and analytics tools to track system health, operational metrics, and user behavior within a regulated environment.

Responsibilities:
  • Defined overall system architecture and cloud deployment strategy on Azure;
  • Led backend and frontend design decisions for a compliance-driven platform;
  • Designed role-based access control and approval workflows aligned with regulatory requirements;
  • Introduced OCR-based automation to reduce manual document processing;
  • Established monitoring and observability standards using Grafana;
  • Defined coding standards, repository structure, and deployment workflows;
  • Coordinated development priorities and ensured production readiness.
Project Tech stack:
React
Next.js
Node.js
Azure SQL
Microsoft Azure
GitHub Actions
CI
CD
Playwright
Google Analytics
Grafana
Senior Full-stack Architect
Mar 2024 - Mar 20251 year
Project Overview

A secure banking verification platform developed for financial institutions and currency exchange operators to authenticate and validate physical currency, identity documents, and compliance-related documentation. The system offered structured verification workflows, role-based access control, audit logging, and reporting tools to meet regulatory requirements and maintain operational transparency. It was designed for high-security environments, ensuring data integrity, traceability, and controlled access.

Responsibilities:
  • Implemented structured verification workflows for currency and document authentication;
  • Developed audit logging and reporting mechanisms to ensure regulatory compliance;
  • Configured role-based access control to maintain secure operations;
  • Centralized verification processes to reduce manual intervention;
  • Ensured system security, data integrity, and traceability;
  • Collaborated with teams to maintain high standards of operational transparency;
  • Supported compliance with internal policies and external regulatory requirements.
Project Tech stack:
React
Next.js
i18next
Microsoft Azure
Azure SQL
Prisma
Node.js
Fastify.js
Auth0
CDN
API Testing
Playwright
CI
CD
Jest
Senior Java Developer
Aug 2017 - May 20213 years 9 months
Project Overview

An IoT-based fleet monitoring platform developed to collect and process telemetry and driver behavior data from devices installed on trucks. The system integrated NVIDIA-based edge computing boards within vehicles with AWS IoT cloud infrastructure, enabling real-time data ingestion, processing, and analytics. It supported large-scale device connectivity, telemetry processing, and provided centralized fleet insights for operational optimization and safety monitoring.

Responsibilities:
  • Developed real-time data ingestion and processing pipelines for vehicle telemetry;
  • Integrated edge computing devices with cloud infrastructure for seamless communication;
  • Implemented analytics features to monitor driver behavior and fleet performance;
  • Managed large-scale device connectivity and data flow;
  • Built centralized dashboards for operational insights and safety monitoring;
  • Ensured reliability, scalability, and high availability of the platform;
Project Tech stack:
Java
Spring Boot
PostgreSQL
AWS
IoT
MongoDB

Education

2009
Electrical, Electronics and Communications Engineering
Master of Science

Languages

Polish
Advanced
English
Advanced

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