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I am a Senior Backend Developer with over 7 years of experience designing and building scalable backend systems, APIs, and microservices for enterprise-grade applications. I am passionate about clean architecture, automation, and mentoring, and I strongly advocate for test-driven development and system observability. Throughout my career, I have successfully supported high-traffic platforms, improved deployment cycles, and significantly reduced cloud costs. With a strong skill set that includes Node.js, Spring Boot, Python, PostgreSQL, and cloud-native environments such as AWS, Kubernetes, and Terraform, I have led backend development efforts across multiple companies. I enjoy driving improvements in CI/CD pipelines, test automation, and monitoring, while also mentoring fellow engineers and fostering team growth. My goal is to continue delivering high-impact backend solutions in fast-paced, scalable environments.…I am a Senior Backend Developer with over 7 years of experience designing and building scalable backend systems, APIs, and microservices for enterprise-grade applications. I am passionate about clean architecture, automation, and mentoring, and I strongly advocate for test-driven development and system observability. Throughout my career, I have successfully supported high-traffic platforms, improved deployment cycles, and significantly reduced cloud costs. With a strong skill set that includes Node.js, Spring Boot, Python, PostgreSQL, and cloud-native environments such as AWS, Kubernetes, and Terraform, I have led backend development efforts across multiple companies. I enjoy driving improvements in CI/CD pipelines, test automation, and monitoring, while also mentoring fellow engineers and fostering team growth. My goal is to continue delivering high-impact backend solutions in fast-paced, scalable environments.

Markus Tamm

Back-End Developer, Developer, Programmer, +3

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I am a Senior Backend Developer with over 7 years of experience designing and building scalable backend systems, APIs, and microservices for enterprise-grade applications. I am passionate about clean architecture, automation, and mentoring, and I strongly advocate for test-driven development and system observability. Throughout my career, I have successfully supported high-traffic platforms, improved deployment cycles, and significantly reduced cloud costs. With a strong skill set that includes Node.js, Spring Boot, Python, PostgreSQL, and cloud-native environments such as AWS, Kubernetes, and Terraform, I have led backend development efforts across multiple companies. I enjoy driving improvements in CI/CD pipelines, test automation, and monitoring, while also mentoring fellow engineers and fostering team growth. My goal is to continue delivering high-impact backend solutions in fast-paced, scalable environments.…I am a Senior Backend Developer with over 7 years of experience designing and building scalable backend systems, APIs, and microservices for enterprise-grade applications. I am passionate about clean architecture, automation, and mentoring, and I strongly advocate for test-driven development and system observability. Throughout my career, I have successfully supported high-traffic platforms, improved deployment cycles, and significantly reduced cloud costs. With a strong skill set that includes Node.js, Spring Boot, Python, PostgreSQL, and cloud-native environments such as AWS, Kubernetes, and Terraform, I have led backend development efforts across multiple companies. I enjoy driving improvements in CI/CD pipelines, test automation, and monitoring, while also mentoring fellow engineers and fostering team growth. My goal is to continue delivering high-impact backend solutions in fast-paced, scalable environments.

Available to hire

I am a Senior Backend Developer with over 7 years of experience designing and building scalable backend systems, APIs, and microservices for enterprise-grade applications. I am passionate about clean architecture, automation, and mentoring, and I strongly advocate for test-driven development and system observability. Throughout my career, I have successfully supported high-traffic platforms, improved deployment cycles, and significantly reduced cloud costs.

With a strong skill set that includes Node.js, Spring Boot, Python, PostgreSQL, and cloud-native environments such as AWS, Kubernetes, and Terraform, I have led backend development efforts across multiple companies. I enjoy driving improvements in CI/CD pipelines, test automation, and monitoring, while also mentoring fellow engineers and fostering team growth. My goal is to continue delivering high-impact backend solutions in fast-paced, scalable environments.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Language

English

Fluent

Work Experience

Senior Software Engineer at Planon

May 31, 2025 - July 28, 2025

Led backend development of 20+ high-availability microservices using NestJS and Kafka, reducing feature delivery time by 80% and enabling horizontal scaling across teams. Designed real-time event systems supporting 10K+ concurrent users with <100ms latency and 99.99% uptime. Reduced cloud infrastructure costs by $32K/year through intelligent autoscaling policies and lifecycle cleanup using Terraform and Pulumi. Authored 20+ REST and GraphQL API endpoints with full Swagger/OpenAPI documentation handling over 1M monthly transactions at <150ms average latency. Implemented OAuth2/JWT/SSO auth systems with Auth0, decreasing login-related tickets by 95%. Built custom monitoring dashboards with Prometheus, Grafana, and Sentry improving incident response by 55%. Spearheaded zero-downtime Kubernetes CI/CD pipeline using GitHub Actions, increasing deployment frequency by 60% and CI pass rate to 98%. Drove test automation achieving 95%+ code coverage and reducing regressions by 70%. Rolled out fe

Back End Developer at P3 Group Inc

February 28, 2023 - July 28, 2025

Designed and delivered 25+ backend microservices using Spring Boot, RabbitMQ, and MongoDB, achieving 99.99% uptime and handling 250K+ monthly active users. Refactored 3 legacy monolithic PHP systems into FastAPI and Node.js microservices, improving throughput by 70% and reducing memory usage by 35%. Enhanced API performance 3x with Redis caching and CDN header optimizations reducing response time from 600ms to 180ms. Developed high-availability gRPC and REST APIs with <120ms latency across 5 environments. Maintained Swagger/OpenAPI documentation for 100+ endpoints, accelerating frontend/backend coordination by 35%. Built GitLab CI/CD pipelines using Jenkins, Docker, and Helm, cutting deployment times from 60 to 15 minutes. Standardized backend test coverage above 90% using PyTest, Cypress, and Selenium reducing post-deployment bugs by 65%. Integrated Segment and FullStory for backend flow tracing improving user retention by 30%. Implemented Helm charts for infrastructure consistency ac

Back End Developer at Serokell

March 31, 2021 - July 28, 2025

Developed a distributed logistics backend in Laravel and PostgreSQL scaled to 2M+ daily operations with 99.98% uptime. Managed integrations with Stripe, Twilio, and SendGrid handling 500K+ monthly transactions with audit logging. Automated CI/CD with GitHub Actions and Kubernetes reducing deployment issues by 60% and release time from 4 hours to 30 minutes. Engineered pre-merge test strategy increasing PR quality and cutting QA turnaround by 40%. Migrated internal dashboards to Vue.js and Chart.js saving over 12 hours/week for the operations team. Performed WCAG-AA accessibility upgrades increasing mobile conversion by 35%. Participated in 20+ agile sprints delivering 80+ backend stories per quarter and reducing story cycle time by 30%. Built custom alerting systems with Kibana and Elasticsearch logs reducing error debugging time by 50%. Initiated infrastructure improvements increasing deployment frequency from biweekly to weekly.

Junior Software Engineer at Nortal

September 30, 2019 - July 28, 2025

Built 10+ internal backend tools using Flask, PostgreSQL, and SQLAlchemy increasing HR/Finance productivity by 35%. Migrated legacy jQuery code to React and Redux reducing frontend-related backend calls by 60% and improving page load time by 40%. Delivered REST APIs serving 10K+ monthly users with <200ms latency and 99.9% uptime. Reduced report generation time from 20s to 5s using Redis-backed job queues and caching. Maintained over 90% unit and integration test coverage with PyTest and Selenium, resulting in 50% fewer regression bugs. Authored deployment scripts, SOPs, and onboarding guides used by 3 development teams. Automated logging, testing, and environment setup with Bash CLI tools saving 10+ hours per month.

Senior Software Engineer at Planon

May 31, 2025 - July 28, 2025

Led backend development of 20+ high-availability microservices using NestJS and Kafka, reducing feature delivery time by 80% and enabling horizontal scaling across teams. Designed real-time event systems supporting 10K+ concurrent users with <100ms latency and 99.99% uptime. Reduced cloud infrastructure costs by $32K/year through autoscaling and lifecycle cleanup of AWS resources. Authored 20+ REST and GraphQL API endpoints supporting over 1M monthly transactions with <150ms average latency. Implemented OAuth2/JWT/SSO auth systems using Auth0, reducing login-related tickets by 95%. Built monitoring dashboards with Prometheus, Grafana, and Sentry, improving incident response by 55%. Spearheaded zero-downtime Kubernetes CI/CD pipelines, increasing deployment frequency by 60%. Drove test automation to 95%+ code coverage, reducing production regressions by 70%. Rolled out feature flag system with LaunchDarkly enabling safe A/B testing. Led backend onboarding and mentorship for 6 engineers

Back End Developer at P3 Group Inc

February 28, 2023 - July 28, 2025

Designed and delivered 25+ backend microservices using Spring Boot, RabbitMQ, and MongoDB, ensuring 99.99% uptime for 250K+ monthly active users. Refactored legacy PHP monoliths to FastAPI and Node.js microservices, improving throughput by 70% and cutting memory usage by 35%. Improved API performance 3x with Redis caching and optimized CDN headers, reducing response times from 600ms to 180ms. Developed secure gRPC and REST APIs with <120ms latency across 5 environments. Maintained Swagger/OpenAPI docs for 100+ endpoints to accelerate coordination. Built multi-env CI/CD pipelines using Jenkins, Docker, and Helm, reducing deployment time by 75%. Enforced 90%+ backend test coverage, lowering post-deployment bugs by 65%. Integrated Segment and FullStory for backend tracing, improving user retention by 30%. Standardized Helm charts for AWS and GCP clusters, cutting provisioning time by 80%.

Back End Developer at Serokell

March 31, 2021 - July 28, 2025

Developed a distributed logistics backend in Laravel + PostgreSQL supporting 2M+ daily operations across 10 geographic zones with 99.98% uptime. Managed integrations with Stripe, Twilio, and SendGrid enabling 500K+ monthly transactions. Automated CI/CD using GitHub Actions and Kubernetes, reducing deployment overhead by 60%. Engineered pre-merge test strategies increasing PR quality and reducing QA turnaround by 40%. Migrated internal dashboards to Vue.js + Chart.js saving 12+ hours/week of ops team workload. Upgraded backend-served UIs for WCAG-AA accessibility, increasing mobile conversion by 35%. Delivered 80+ backend stories per quarter and improved sprint predictability by 25%. Built custom alerting systems using Kibana + Elasticsearch, halving error debugging time. Increased backend deployment frequency from biweekly to weekly.

Junior Software Engineer at Nortal

September 30, 2019 - July 28, 2025

Built 10+ internal backend tools using Flask, PostgreSQL, and SQLAlchemy, boosting HR and Finance productivity by 35%. Migrated legacy jQuery code to React + Redux, reducing backend calls by 60% and improving page load time by 40%. Delivered REST APIs with consistent <200ms latency and 99.9% uptime serving 10K+ monthly users. Reduced report generation time from 20s to 5s using Redis-backed job queues and caching. Maintained 90%+ test coverage with PyTest and Selenium, cutting regression bugs by 50%. Authored deployment scripts, SOPs, and onboarding docs used across three teams. Automated logging, testing, and environment setups via custom Bash CLI tools saving 10+ hours/month.

Senior Software Engineer at Planon

May 1, 2025 - August 7, 2025

Led backend development of over 20 high-availability microservices using NestJS and Kafka, reducing feature delivery time significantly and enabling scalable team collaboration. Designed real-time event systems for 10K+ concurrent users achieving low latency and high uptime. Reduced cloud infrastructure costs by $32K per year through autoscaling policies and resource lifecycle cleanup employing Terraform and Pulumi. Authored over 20 REST and GraphQL API endpoints with comprehensive Swagger/OpenAPI documentation supporting more than 1 million monthly transactions with minimal latency. Implemented secure authentication systems based on OAuth2, JWT, and SSO with Auth0, vastly reducing login support tickets. Developed custom monitoring dashboards that improved incident response time, built zero-downtime Kubernetes CI/CD pipelines increasing deployment frequency and success rates, and drove test automation resulting in high code coverage and reduced production regressions. Rolled out featur

Back End Developer at P3 Group Inc

February 1, 2023 - August 7, 2025

Designed and delivered over 25 backend microservices using Spring Boot, RabbitMQ, and MongoDB ensuring high uptime and supporting a large user base. Refactored legacy monolithic PHP systems into distributed FastAPI and Node.js microservices, improving throughput and cutting memory usage. Enhanced API performance threefold with Redis caching and CDN optimization. Developed secure high-availability gRPC and REST APIs for internal communications with low latency across multiple environments. Maintained extensive API documentation to accelerate collaboration. Built GitLab-based multi-environment CI/CD pipelines to reduce deployment time significantly. Standardized backend testing to achieve high coverage and reduced bugs. Integrated analytics tools to improve user retention through backend flow tracing. Introduced infrastructure consistency using Helm charts on AWS and GCP, and contributed continuously in agile sprint reviews improving sprint predictability.

Back End Developer at Serokell

March 1, 2021 - August 7, 2025

Developed a distributed logistics backend using Laravel and PostgreSQL that operated 2 million+ daily operations with high uptime across multiple geographic zones. Managed backend integrations with payment and communication services handling large transaction volumes with robust audit logging. Automated CI/CD pipelines with GitHub Actions and Kubernetes reducing deployment issues and overhead. Engineered pre-merge test strategies improving PR quality and reducing QA turnaround time. Migrated internal dashboards to Vue.js and Chart.js backed by APIs, significantly reducing operational workload. Upgraded accessibility compliance improving mobile conversions. Participated actively in agile sprints delivering numerous backend stories with reduced cycle times. Built custom alerting systems that cut production debugging times and increased backend deployment frequency.

Junior Software Engineer at Nortal

September 1, 2019 - August 7, 2025

Developed multiple internal backend tools with Flask, PostgreSQL, and SQLAlchemy increasing productivity in HR and Finance teams. Migrated legacy jQuery frontend code to React and Redux improving performance and reducing backend calls. Delivered REST APIs serving tens of thousands of monthly users with low latency and high uptime. Optimized report generation process leveraging Redis job queues and caching. Maintained high unit and integration test coverage resulting in fewer regression bugs. Authored many deployment scripts and onboarding documentation used across teams. Automated logging, testing, and environment setups with custom CLI tools saving significant setup time monthly.