Joachim Tworko
Senior Backend Developer
Open to new opportunities
Senior Backend Developer roles in enterprise companies
Joachim Tworko
Building scalable backend systems for enterprise clients in banking and healthcare sectors
About Me
Senior Backend Developer with 5+ years of experience building robust, scalable enterprise solutions for the banking and healthcare sectors. Specialized in Java, Spring Boot, and microservices architecture, with proven expertise in delivering mission-critical systems for large organizations like Credit Agricole, BNP Paribas, FAB UAE and Commercial Bank of Dubai
I excel at architecting backend systems that handle high traffic, complex business logic, and strict security requirements. My approach combines clean code principles, comprehensive testing, and DevOps best practices to ensure reliable, maintainable solutions. GCP certified with hands-on experience in cloud infrastructure and CI/CD pipelines.
- Residence Poland
- Address Rzeszów
- e-mail tworkojoachim@gmail.com
- Phone +48 731 303 413
What I Do
Clients
Collaboration B2B
Clients & Partners
7+ B2B partnershipsWorking Hours
~11,520 and countingProjects Delivered
15+ completed successfullyResume
Education
2021-2022
University of Information Technology and ManagementComputer Science specialization in Software Engineering
Master’s thesis focused on performance evaluation of Spring Boot and Quarkus libraries in microservices architecture applications.
2017-2021
University of RzeszowComputer Science specialization in Web Applications
Participated in two student scientific clubs and completed an engineer’s thesis involving the independent development of an original web application for creating IT teams.
Experience
2022 - Current
DevinitiSoftware Engineer
Technologies: Java, Spring Boot, Kotlin, PostgreSQL, MongoDB, Redis, Kubernetes, GCP
- Architected and led development of digital onboarding platform enabling fully remote bank account and business registration with 95%+ completion rate
- Designed microservices architecture integrating 8+ third-party services (KYC, identity verification, e-signatures) with circuit breaker patterns for resilience
- Reduced API response times by 40% through database query optimization and implementing Redis caching layer
- Currently developing award-winning internal employee app (2024 Employer Branding Excellence Award) serving 5000+ bank employees with features including AI chat, resource management, and gamification
- Implemented comprehensive testing strategy (unit, integration, E2E) achieving 85% code coverage and zero critical bugs in production
2024
AppwiseSoftware Engineer
Technologies: Java, Spring Boot, Microservices, PostgreSQL, MongoDB
- Developed logistics TMS system for one of Europe's largest freight companies, including mobile app for drivers and web portal for business operations
- Built waste management platform for Alba with comprehensive CMS, route planning for collection vehicles, warehouse management, and electronic document handling
- Implemented backend services for automated invoicing, weight tracking systems, and fleet management modules
- Delivered new features through full development cycle including planning, implementation, testing, and bug fixing
2023
Altkom SoftwareSoftware Engineer
Technologies: Java, Spring Boot, Microservices, PostgreSQL, Kafka, Docker, GitLab CI
- Developed medical risk evaluation module within large-scale insurance platform comprising 30+ microservices
- Mentored 3 junior developers on best practices, code quality, and microservices patterns while conducting 50+ code reviews
- Implemented event-driven architecture using Kafka for asynchronous processing of survey submissions, improving throughput by 60%
- Collaborated with product team to design and deliver 5 major features within strict healthcare compliance requirements
2022
NVTJava Developer
Technologies: Java, Spring Boot, PostgreSQL, MongoDB, REST API, WebSockets
- Architected and built reusable Kanban board library supporting both SQL and NoSQL databases, adopted across 3 client projects
- Developed comprehensive CRM system managing employees, inventory, warehousing, and invoicing for manufacturing client
- Implemented real-time updates using WebSockets for collaborative board interactions with 50+ concurrent users
- Integrated email/SMS notification system and automated billing workflows, reducing manual processing time by 70%
2021 - 2022
WhirlyMid Full Stack Engineer
At Whirly, I worked as a Full Stack Developer on a custom IVR solution for the telecom industry. I handled both backend and frontend tasks, developed new features, fixed bugs, wrote technical documentation, and implemented automated tests. The project followed a Domain-Driven Design approach.
2020 - 2021
BNP ParibasJunior Full Stack Engineer
Technologies: Java, Spring Boot, Angular, GCP, OpenShift, PostgreSQL, Python
- Built cloud cost calculator for architecture team to estimate and optimize GCP infrastructure costs across 50+ projects
- Developed document processing pipeline for AI team to prepare banking documents for ML model training
- Deployed and maintained applications on GCP and OpenShift, gaining hands-on experience with cloud-native development
- Collaborated with senior engineers in Agile environment, participating in daily standups, sprint planning, and retrospectives
2019
Transition TechnologyInternship Full Stack Engineer
I took part in a two-month internal project focused on an office management system. I was responsible for developing features, writing technical documentation, collaborating with the team, and creating unit and integration tests.
Core Technologies
Backend & Languages
Databases
Cloud & DevOps
Additional Skills
Knowledges
- VAVR
- WireMock
- LDAP
- TestContainers
- Junit
- Firebase
- SOAP
- SFTP
- Figma
- RabbitMQ
- Apache Kafka
- Swagger
- H2
- Groovy
- Spock
- Keycloack
- Selenium
- Cypress
- AWS
- GCP
- Azure
Certificates
App Deployment, Debugging, and Performance
Developing Applications with Google Cloud Platform
Securing and Integrating Components of your Application
Google Cloud Fundamentals: Core Infrastructure
Portfolio
MobilCA
mobileAward-winning internal employee app for Credit Agricole with AI chat, resource booking, and gamification
MyFoodie
mobileFood delivery platform with real-time order tracking and restaurant management system
Ca24
mobileDigital banking onboarding platform with remote account opening and business registration
CBD
mobileInvestment portfolio management application for stocks, assets tracking, and financial portfolio optimization
TMS (Transport Management System)
WebLogistics platform for European freight with mobile driver app and business portal
Medical Risk Evaluation Platform
WebHealthcare insurance platform with medical surveys and risk assessment in microservices architecture
Bank Assistant
devopsCloud cost calculator and infrastructure optimization tool for banking architecture team
AI Agent
devops, webAI document processing pipeline for banking document recognition and ML model training