Andrei K. — Senior Backend Developer

Expertise in Back-End Web (11.0 yr.), DevOps (8.5 yr.).

Last verified on October, 2025

Core Skills

Java

10 yr.

Kotlin

Spring

Spring Boot

AWS

6 yr.

Bio Summary

Results-driven Senior Java Backend Developer with 11+ years of experience specialising in Java-based API integration and microservices architecture. Worked in international teams of 2–25 members, both on-site and remotely, with 3 years of proven team leadership.
• Expertise: Kubernetes (AKS, AWS, GCP , OpenShift), cloud computing, enterprise integration platforms (EIP), and workflow automation.
• Leadership: Successfully led teams, mentored developers, and drove the adoption of best practices in software design, CI/CD, and Agile methodologies (Scrum,
Kanban).

Technical Skills

Programming Languages	Java, Kotlin
Java Libraries and Tools	Apache Camel
Android Libraries and Tools	Kotlin
Java Frameworks	Spring, Spring Boot
Security	IAM
Databases & Management Systems / ORM	MongoDB, PostgreSQL
Cloud Platforms, Services & Computing	AWS, GCP
Azure Cloud Services	AKS
Amazon Web Services	AWS CloudWatch, AWS CodePipeline, AWS EventBridge, AWS Lambda, AWS Route 53, AWS SQS, AWS VPC
SDK / API and Integrations	Keycloak, OAuth
Virtualization, Containers and Orchestration	Kubernetes
Message/Queue/Task Brokers	RabbitMQ
Other Technical Skills	Apache Kafka, BPMN Camunda, Openshift Cloud Platform, RDS

Work Experience

Senior Java Backend Developer | Full Stack, Construction site management

Duration: February 2020 – September 2025

Summary: Led the development of an in-house software platform IRIS for central management of construction site documentation and data, significantly enhancing performance, scalability, system responsiveness, and reliability through technical improvements and mentoring.

Responsibilities: Rewrote the synchronization service, reduced API response time, designed and built microservices from scratch, optimized access control, achieved high unit test coverage, resolved technical issues leading to zero technical debt, led migration from monolith to microservices, developed critical microservices on Java Spring Boot, led PoC solutions, implemented CI/CD pipelines, optimized cloud infrastructure and system performance, implemented Keycloak for OAuth2 and SSO, provided technical expertise, authored technical documentation, and trained new hires.

Technologies: Kotlin, Java 21, Spring, PostgreSQL, MongoDB, RabbitMQ, Redis, AWS EKS, S3, RDS, SQS, CloudWatch, EC2, CodePipeline, EventBridge, Lambda, IAM, VPC, Route 53, ACM

Senior Java Backend Developer | Tech Lead, Banking and insurance services

Duration: August 2014 – February 2020

Summary: Spearheaded the development and launch of a multitude of banking products, driving integration, rebuilding the core EIP, migrating to ELK and Kafka, redesigning BPMN diagrams, and decomposing a monolithic Red Hat JBoss Fuse project into microservices.

Responsibilities: Delivered integration services for major banks, rebuilt EIP core, moved search from PostgreSQL to ELK, migrated messaging from IBM WMQ to Kafka, designed BPMN diagrams, led backend teams, promoted from Junior Developer to Lead Developer, optimized monolithic applications, developed high-load data processing systems, built reactive microservices, implemented DevOps initiatives, and developed workflows with Camunda.

Technologies: Java 17, Kotlin, Spring, PostgreSQL, MongoDB, Apache Kafka, Camunda BPMN, Kubernetes, OpenShift, Apache Camel

Education

Master's Degree in Computer Science
Voronezh State Technical University
2014

How to hire with Upstaff

1

Talk to Our Talent Expert

Our journey starts with a 30-min discovery call to explore your project challenges, technical needs and team diversity.

2

Meet Carefully Matched Talents

Within 1-3 days, we’ll share profiles and connect you with the right talents for your project. Schedule a call to meet engineers in person.

3

Validate Your Choice

Bring new talent on board with a trial period to confirm you hire the right one. There are no termination fees or hidden costs.

Why Upstaff

Upstaff is a technology partner with expertise in AI, Web3, Software, and Data. We help businesses gain competitive edge by optimizing existing systems and utilizing modern technology to fuel business growth.

Real-time project team launch

<24h

Interview First Engineers

Upstaff's network enables clients to access specialists within hours & days, streamlining the hiring process to 24-48 hours, start ASAP.

x10

Faster Talent Acquisition

Upstaff's network & platform enables clients to scale up and down blazing fast. Every hire typically is 10x faster comparing to regular recruitement workflow.

Vetted and Trusted Engineers

100%

Security And Vetting-First

AI tools and expert human reviewers in the vetting process is combined with track record & historically collected feedbacks from clients and teammates.

~50h

Save Time For Deep Vetting

In average, we save over 50 hours of client team to interview candidates for each job position. We are fueled by a passion for tech expertise, drawn from our deep understanding of the industry.

Flexible Engagement Models

Custom Engagement Models

Flexible staffing solutions, accommodating both short-term projects and longer-term engagements, full-time & part-time

Unique Talent Ecosystem

Candidate Staffing Platform stores data about past and present candidates, enables fast work and scalability, providing clients with valuable insights into their talent pipeline.

Transparent

$0

No Hidden Costs

Price quoted is the total price to you. No hidden or unexpected cost for for candidate placement.

x1

One Consolidated Invoice

No matter how many engineers you employ, there is only one monthly consolidated invoice.

Ready to hire Andrei K.
or someone with similar Skills?

Book a call with Andrei K.

Start Hiring