I’m a senior web developer with 12+ years of professional experience since graduating, and a big chunk of that time has been spent shipping React-based products that actually have to perform under real customer traffic. I’m at my best when I can own a site end-to-end: hosting, deployments, uptime, security patches, performance tuning, and then the UI polish that makes the whole thing feel expensive (in a good way). Ecommerce work has been a repeat theme for me over the years, especially where payments, reliability, and “nothing can break” releases are involved. I’m comfortable jumping between design-focused frontend work and the more practical ops side of keeping environments stable and predictable. And yeah, I’m the person who will notice if a layout is 2px off and also notice if a server is quietly running out of disk. In remote contract setups, I tend to be pretty self-sufficient: I’ll ask the right questions early, ship in small safe steps, and keep a running doc so nobody’s guessing what changed or why. I’m used to tight delivery windows (including 3month improvement sprints), and I’m not precious about doing the unglamorous parts like dependency upgrades, security reviews, and housekeeping—those are usually what keep ecommerce sites healthy long-term. When it’s time to add features, I can integrate payment gateways, analytics, email/CRM hooks, and whatever other third-party pieces the business needs without turning the codebase into a mess. Overall, I aim for sites that are fast, stable, easy to operate, and visually consistent—because customers feel that stuff even when they can’t name it.

Andres Sepp

I’m a senior web developer with 12+ years of professional experience since graduating, and a big chunk of that time has been spent shipping React-based products that actually have to perform under real customer traffic. I’m at my best when I can own a site end-to-end: hosting, deployments, uptime, security patches, performance tuning, and then the UI polish that makes the whole thing feel expensive (in a good way). Ecommerce work has been a repeat theme for me over the years, especially where payments, reliability, and “nothing can break” releases are involved. I’m comfortable jumping between design-focused frontend work and the more practical ops side of keeping environments stable and predictable. And yeah, I’m the person who will notice if a layout is 2px off and also notice if a server is quietly running out of disk. In remote contract setups, I tend to be pretty self-sufficient: I’ll ask the right questions early, ship in small safe steps, and keep a running doc so nobody’s guessing what changed or why. I’m used to tight delivery windows (including 3month improvement sprints), and I’m not precious about doing the unglamorous parts like dependency upgrades, security reviews, and housekeeping—those are usually what keep ecommerce sites healthy long-term. When it’s time to add features, I can integrate payment gateways, analytics, email/CRM hooks, and whatever other third-party pieces the business needs without turning the codebase into a mess. Overall, I aim for sites that are fast, stable, easy to operate, and visually consistent—because customers feel that stuff even when they can’t name it.

Available to hire

I’m a senior web developer with 12+ years of professional experience since graduating, and a big chunk of that time has been spent shipping React-based products that actually have to perform under real customer traffic. I’m at my best when I can own a site end-to-end: hosting, deployments, uptime, security patches, performance tuning,
and then the UI polish that makes the whole thing feel expensive (in a good way). Ecommerce work has been a repeat theme for me over the years, especially where payments, reliability, and “nothing can break” releases are involved. I’m comfortable jumping between design-focused frontend work and the more practical ops side of
keeping environments stable and predictable. And yeah, I’m the person who will notice if a layout is 2px off and also notice if a server is quietly running out of disk.
In remote contract setups, I tend to be pretty self-sufficient: I’ll ask the right questions early, ship in small safe steps, and keep a running doc so nobody’s guessing what changed or why. I’m used to tight delivery windows (including 3month improvement sprints), and I’m not precious about doing the unglamorous parts like dependency
upgrades, security reviews, and housekeeping—those are usually what keep ecommerce sites healthy long-term.
When it’s time to add features, I can integrate payment gateways, analytics, email/CRM hooks, and whatever other third-party pieces the business needs without turning the codebase into a mess. Overall, I aim for sites that are fast, stable, easy to operate, and visually consistent—because customers feel that stuff even when they can’t name it.

See more

Experience Level

Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Intermediate
See more

Work Experience

Lead Backend Engineer at Capgemini
March 1, 2023 - Present
Led development of enterprise and public-sector web platforms, owning architecture, implementation, and long-term maintainability. Built and maintained React and Next.js applications with server-side rendering, static generation, and SEO best practices. Designed and integrated WordPress and headless WordPress solutions, enabling scalable content management while preserving frontend performance and design standards. Developed backend services and APIs using Java Spring Boot, Python (FastAPI, Django), and Node.js to support secure, high-throughput workloads. Migrated Angular apps to React and Next.js. Improved performance, accessibility, maintainability. Established CI/CD pipelines and cloud deployments across AWS and Azure using Docker and Kubernetes. Acted as technical lead and mentor, reviewing code and guiding architecture decisions across teams.
Lead Backend Engineer at Siemens Digital Industries Software
November 1, 2020 - May 1, 2023
Led architecture and delivery of cloud-native, data-intensive platforms supporting global industrial analytics and telemetry systems. Built scalable microservices using Java Spring Boot, Python, Node.js, and Go, optimized for reliability, observability, and performance. Defined robust API contracts consumed by React and Next.js frontends, enabling seamless frontend evolution without service disruption. Supported internal and customer-facing WordPress portals for documentation, product communication, and enterprise content delivery. Implemented event-driven architectures with Kafka and PostgreSQL, processing millions of events daily with predictable latency. Designed secure multi-tenant RBAC systems for large enterprise clients. Mentored senior engineers and contributed to long-term platform strategy and technical governance.
Full Stack Developer at EPAM Systems
July 1, 2014 - May 1, 2019
Delivered enterprise-grade web applications for banking, telecom, and logistics across multiple regions. Built frontend platforms using React, early Next.js, Angular, and Vue.js with a strong focus on performance and usability. Developed and customized WordPress themes, plugins, and headless CMS integrations for content-driven and multilingual websites. Implemented backend services using Java Spring, Python (Django), Ruby on Rails, .NET Core, and Node.js, supporting complex business workflows. Led legacy system upgrades and frontend migrations from AngularJS to modern frameworks. Integrated third-party APIs, authentication providers, and cloud services. Supported AWS and hybrid deployments and improved delivery reliability through CI/CD automation.

Education

Bachelor of Science in Computer Science at Tallinn University of Technology
January 1, 2009 - January 1, 2013

Qualifications

Add your qualifications or awards here.

Industry Experience

Software & Internet, Professional Services

Experience Level

Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Intermediate
See more

Hire a Full Stack Developer

We have the best full stack developer experts on Twine. Hire a full stack developer in Tartu today.