Mikalai is available for hire
Hire MikalaiMikalai Miatlitski
Verified Expert in Engineering
CSS Developer
Chanhassen, MN, United States
Toptal member since May 26, 2016
Bio
Mikalai is a senior full-stack engineer and technical leader with over a decade of experience building enterprise Java, Spring, React, and SaaS platforms. He specializes in secure, scalable business applications, API-driven architectures, and workflow automation. Recently, Mikalai has expanded his work into AI-enabled product development, including LLM API integration, AI-assisted back-end generation, prompt-driven workflows, and intelligent automation for enterprise systems.
Portfolio
Morgan Stanley
Java, JavaScript, Spring Boot, Hibernate, Full-stack, Docker...
Church Community Builder
React, React Native, Expo.io, Mobile, SQL, MySQL, Redux, Git...
SpecterOps
React, Material UI, JavaScript, HTML, CSS, ReGraph, Cypress, TypeScript...
Experience
- JavaScript - 20 years
- HTML - 20 years
- CSS - 20 years
- Java - 12 years
- Spring - 12 years
- React Native - 7 years
- React - 5 years
- D3.js - 4 years
Work Experience
Senior Full-stack Developer
2022 - 2026
Morgan Stanley
- Improved application security by identifying vulnerabilities and applying secure coding practices across enterprise systems.
- Optimized server-side JSON processing, improving API response performance by 30% to 50%.
- Designed and implemented secure full-stack investment business solutions using Java, Spring Boot, React, and REST APIs.
- Contributed to AI-ready application architecture by building secure, structured APIs and data workflows suitable for intelligent automation and LLM-powered business features.
Technologies: Java, JavaScript, Spring Boot, Hibernate, Full-stack, Docker, Amazon Web Services (AWS), Go, Dynatrace, GitHub, GitLab, SonarQube, SaaS, APIs, PostgreSQL, API Integration, Full-stack Development, Software as a Service (SaaS), Software Architecture, Python, Software Design, Flutter, Cloud Infrastructure, DevOps, Docker Compose, Supabase, API Development, Amazon RDS, Authentication, Unit Testing, SQL Server, Amazon EC2, Databases, Artificial Intelligence (AI), Relational Databases, AWS CloudFormation, AWS Lambda, Amazon EKS
React Developer
2021 - 2022
Church Community Builder
- Developed reusable React components and integrated them into the legacy codebase.
- Created integration E2E tests for new functionality.
- Provided maintenance for a React Native mobile application.
Technologies: React, React Native, Expo.io, Mobile, SQL, MySQL, Redux, Git, Visual Studio Code (VS Code), CSS, HTML, REST, Webpack, TypeScript, jQuery, REST APIs, JavaScript, Full-stack, GitHub, GitLab, SaaS, APIs, API Integration, Next.js, Software as a Service (SaaS), Tailwind CSS, Vercel, Unit Testing
Front-end developer
2020 - 2021
SpecterOps
- Developed highly performant and reusable React UI components based on the Material-UI library.
- Implemented data-driven UI by consuming a RESTful back-end API.
- Integrated data visualization solutions based on Regraph and Highcharts.
- Created unit tests using the react-testing library and E2E tests using Cypress.io.
- Developed a UI prototype leading up to a successful demo.
Technologies: React, Material UI, JavaScript, HTML, CSS, ReGraph, Cypress, TypeScript, Highcharts, Redux, Git, Visual Studio Code (VS Code), GitHub, SaaS, APIs, API Integration, Next.js, Tailwind CSS, Vercel, Unit Testing, Kubernetes
Lead Full-stack Developer
2016 - 2020
API Outsourcing/Centreviews
- Developed a React-powered single-page application.
- Integrated React-driven UI components into the legacy servlets, JSP, and JavaScript application.
- Implemented a SCIM specification as a fully configurable Java framework.
- Came up with the concept and designed core components for a configurable RESTful interface based on Spring Data REST.
- Optimized the build process to promote CI/CD best practices.
- Created complex scalable, data-driven, React-powered UI components.
- Collaborated with a third-party contractor graphical design company to implement the suggested UI redesign and rebranding.
Technologies: React, JavaScript, Spring, Java, MySQL, XML, Hibernate, Jakarta Server Pages (JSP), Redux, Git, D3.js, User Experience (UX), Jenkins, CSS, HTML, REST, Liquibase, Webpack, IntelliJ IDEA, Java SE (Core Java), Apache Maven, jQuery, REST APIs, Node.js, Full-stack, Docker, Amazon Web Services (AWS), Go, Dynatrace, GitHub, Single Sign-on (SSO), SaaS, APIs, PostgreSQL, API Integration, Full-stack Development, Software as a Service (SaaS), Stripe, Stripe API, Stripe Subscriptions, Software Architecture, Python, Software Design, Flutter, .NET, C#, Automation, Cloud Infrastructure, API Development, Amazon RDS, Authentication, Unit Testing, SQL Server, Amazon EC2, Twilio, Databases, Artificial Intelligence (AI), Relational Databases, Database Design
Tech Lead | Consultant
2013 - 2016
Coherent Solutions, Inc. (US)
- Led the development team to achieve deliveries within the functionality, quality, and schedule through a QA sign-off.
- Conducted code reviews for quality control and best practices.
- Established an overall software engineering process via setting standards and expectations.
- Developed and maintained a series of technical designs.
- Led technical meetings to discuss and brainstorm solutions.
Technologies: XML, HTML, SQL, JavaScript, Java, MySQL, Spring, Hibernate, Jakarta Server Pages (JSP), React, Git, User Experience (UX), Jenkins, CSS, REST, IntelliJ IDEA, Multidimensional Expressions (MDX), Java SE (Core Java), Apache Maven, jQuery, REST APIs, Amazon Web Services (AWS), GitHub, Single Sign-on (SSO), Software as a Service (SaaS), Relational Databases
Lead Developer | Software Analyst
2012 - 2013
Coherent Solutions, Inc. (US)
- Developed and maintained a re-factoring plan for AGNIS (A Growable Network Information System) v2.0.
- Modified the web service architecture to accommodate the new requirements.
- Upgraded a service engine and third-party components.
- Integrated a Maven build-and-management tool into a legacy project.
Technologies: SOAP, Java, MySQL, XML, Spring, Hibernate, Jakarta Server Pages (JSP), CSS, HTML, IntelliJ IDEA, Java SE (Core Java), jQuery, JavaScript, Full-stack, Relational Databases
Tech Lead | Consultant
2011 - 2012
Coherent Solutions, Inc. (US)
- Designed and implemented a highly configurable CMS framework.
- Performed analysis of performance issues, proposed solutions, and supervised their implementation.
- Designed, prototyped, and led the implementation of a responsive mobile and desktop UI.
- Created performance analysis reports using BI tools, icCube, and MDX.
- Developed an on-the-fly, persistent, JavaBeans classes generator based on Hibernate, mapping the files using an ASM library.
Technologies: HTML, XML, SQL, JavaScript, Java, MySQL, Spring, Hibernate, Jakarta Server Pages (JSP), CSS, IntelliJ IDEA, Java SE (Core Java), jQuery, PostgreSQL, Relational Databases
Senior Software Engineer
2008 - 2011
ISSoft (Belarus)
- Performed technical leadership over junior team members.
- Developed persistence-layer components with Hibernate ORM.
- Ported the legacy ASP application's codebase to Java/JSP.
- Optimized the database schema to meet performance requirements.
- Developed a number of client-side components using JavaScript and AJAX.
Technologies: XML, SQL, JavaScript, Java, MySQL, Jakarta Server Pages (JSP), CSS, HTML, Amazon Web Services (AWS), Relational Databases
Software Engineer
2006 - 2008
ISSoft (Belarus)
- Designed and implemented a persistence layer to support the security sub-system.
- Developed back-end server components using the existing management system.
- Performed cross-browser adaptation of HTML and CSS web pages.
- Developed custom UI controls and client-side validation.
- Built a custom configurable UI framework using Ajax.
Technologies: HTML, SQL, JavaScript, Java, MySQL, XML, CSS, Relational Databases
Project History
Centreviews | Business Intelligence Suite
The Centreviews suite aims to automate back office processes via:
• Providing an automated workflow platform.
• Giving the user the ability to link all supporting documents from order to payment with the invoice.
• Providing a single centralized documents repository.
• Providing an automated workflow platform.
• Giving the user the ability to link all supporting documents from order to payment with the invoice.
• Providing a single centralized documents repository.
A Growable Network Information System (National Marrow Donor Program)
AGNIS (A Growable Network Information System) is an open-source messaging system specifically designed to exchange hematopoietic cell transplant data using a secure, standards-based system. My role was to optimize the service by removing unused components and streamlining the build and test processes by introducing Maven.
Bloodhound Enterprise
https://bloodhoundenterprise.io/The attack path management solution continuously maps and quantifies active directory attack paths, assesses the impact of the most critical chokepoints, and continually monitors and reports on attack path exposure over time.
Platform for Back-end Services | Founder and Lead Engineer
https://www.restapicms.comA developer platform that automatically generates back-end services (database schema, REST APIs, and admin console) from user-defined configuration. The platform dynamically provisions back-end services using Docker containers and reverse proxy routing.
• Architected and built a multi-tenant SaaS platform enabling users to create back-end services without writing server code.
• Implemented automatic back-end generation, including database schema, REST endpoints, OpenAPI documentation, and administrative UI.
• Implemented service routing and isolation for dynamically provisioned back-end instances using Docker containers and NGINX reverse proxy.
• Developed an advanced query engine allowing complex filtering criteria through UI.
• Built data visualization components using D3.js.
• Implemented role-based access control using Spring Security and JWT.
• Deployed production infrastructure on AWS EC2 with Linux services.
• Architected and built a multi-tenant SaaS platform enabling users to create back-end services without writing server code.
• Implemented automatic back-end generation, including database schema, REST endpoints, OpenAPI documentation, and administrative UI.
• Implemented service routing and isolation for dynamically provisioned back-end instances using Docker containers and NGINX reverse proxy.
• Developed an advanced query engine allowing complex filtering criteria through UI.
• Built data visualization components using D3.js.
• Implemented role-based access control using Spring Security and JWT.
• Deployed production infrastructure on AWS EC2 with Linux services.
Education
1998 - 2003
Bachelor's Degree in Computer Engineering
Belarusian State University of Informatics and Radioelectronics - Minsk, Belarus
Certifications
JANUARY 2024 - PRESENT
Investment Foundations Certificate
CFA Institute
SEPTEMBER 2020 - PRESENT
React Native
Udemy
DECEMBER 2007 - PRESENT
Sun Certified Java Developer
Sun Microsystems
Skills
Libraries/APIs
React, D3.js, Liquibase, jQuery, REST APIs, OpenAPI, Stripe, Stripe API, API Development, Node.js, Highcharts
Tools
Git, Webpack, Apache Maven, Dynatrace, GitHub, GitLab, SonarQube, IntelliJ IDEA, Docker Compose, Jenkins, ReGraph, Expo.io, AWS CloudFormation, Amazon EKS
Languages
TypeScript, CSS, Java, HTML, XML, SQL, JavaScript, Go, Python, C#, Java SE (Core Java)
Frameworks
Redux, React Native, Spring, Hibernate, Jakarta Server Pages (JSP), Ext JS, Next.js, Tailwind CSS, Flutter, .NET, Unity3D, Material UI, Cypress, Spring Boot
Paradigms
REST, Automation, Unit Testing, Database Design, DevOps
Platforms
Amazon Web Services (AWS), Docker, Vercel, Amazon EC2, Twilio, Windows, Visual Studio Code (VS Code), Mobile, Kubernetes, AWS Lambda
Storage
MySQL, PostgreSQL, Databases, Relational Databases
Other
User Experience (UX), Legacy Code, SaaS, Back-end as a Service (BaaS), User Interface (UI), APIs, Full-stack, Single Sign-on (SSO), API Integration, Full-stack Development, Software as a Service (SaaS), Stripe Subscriptions, Software Architecture, Software Design, Cloud Infrastructure, Amazon RDS, Authentication, SQL Server, Artificial Intelligence (AI), Minimum Viable Product (MVP), LLM Integration, Supabase, SOAP, Multidimensional Expressions (MDX), Electronics, Investments, Derivatives, Financing
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