Jonas Keller
Senior software engineer
Oslo, Norway
www.linkedin.com/in/jonas-keller-51aa3736b
https://github.com/k-tourist
Summary
A results-driven Senior Software Engineer with 10+ years of experience delivering high-quality web & mobile apps, workflow
automations, system integrations, and database solutions. Excellent at designing scalable architectures, optimizing workflow
processes, and automating business processes to enhance operational efficiency. Strong business analysis and solution design
capabilities, combining technical implementation with strategic business goals. Proven track record across diverse industries,
including SaaS, Healthcare, Finance, and Travel Portal, consistently delivering innovative and impactful solutions.
Skills
Programming — JavaScript | TypeScript | PHP | Python
Front-End — React.js | Next.js | Angular.js | Vue.js | Storybook
Back-End — Node.js | Nest.js | Fast API | Django | Wordpress | Laravel | Restful APIs | GraphQL | Web Socket | Kafka
Mobile — React Native | Expo | Flutter
Database Management — PostgreSQL | MongoDB | MySQL | Redis
Cloud & DevOps — AWS (Lambda, EC2, S3) | GCP | Azure | Git | CI/CD | Docker | Kubernetes | Microservices
Testing & Quality Assurance — Jest | Selenium | Cypress | Playwright | PyTest | React Testing Library
Integrations & Automation — OpenAI API | Anthropic API | LangChain | RAG | OAuth | Stripe | Make | N8N | Zapier
Methodologies — Agile | Scrum | Kanban | TDD | MVC | MVVM
Professional Experience
Full Stack Engineer
11/2023 – 06/2025 | Oslo, Oslo, Norway
Innovena - Full time
Developed Digital Marketing System using Supabase and React, eliminating third-party bottlenecks and reducing operational
costs by 80%.
Integrated OpenAl, Anthropic API and Perplexity API to automate story research and generation, reducing campaign prep
time by 70% and improving storytelling quality at scale.
Built a real-time campaign dashboard with live metrics, scheduling, and tracking, enabling marketing teams to monitor
performance and adapt strategies instantly.
Re-architected automation logic using serverless functions, enhancing email segmentation accuracy and boosting open rates
by 15%.
Leveraged AWS cloud services for reliable and secure hosting of the financial management system, achieving 99.9% uptime
and ensuring high availability and scalability.
Implemented GraphQL for efficient API query management, reducing query response times by 40%.
Utilized AWS CI/CD services to automate build, test, and deployment processes, significantly accelerating release cycles by
30%.
Applied Test-Driven Development (TDD) using React Testing Library and leveraged Storybook for component isolation and
documentation, leading to a 50% reduction in bugs and improved frontend maintainability.
Built and optimized a React Native mobile application featuring an AI-powered legal assistant chatbot, increasing user
engagement by 35% and reducing response time for legal queries by 50%.
Integrated NLP algorithms to interpret user intent and context accurately, improving chatbot response accuracy by 40% and
user satisfaction scores by 25%.
Designed intuitive conversational flows for legal service discovery and advice processes, reducing user drop-off rate by 30%
and boosting conversion for legal services by 20%.
Published to the Google Play Store, ensuring 99.9% crash-free sessions and a 4.6 user rating within the first quarter after
launch.
Led development of a fault-tolerant, high-performance API layer and a real-time video/call application used by hundreds of
insurance companies nationwide, handling 10k+ concurrent calls with 99.95% uptime.
Developed RESTful APIs and serverless MongoDB Atlas functions, reducing backend latency by 45%.
Designed and deployed containerized microservices using Docker-Kubernetes, decreasing infrastructure costs by 25% and
scaling seamlessly for 3x traffic spikes.
Managed migration of millions of legacy audio recordings during a post-merger infrastructure transition, completing 100%
data integrity transfer and reducing storage costs by 20% through codec optimization.
Mentored 3 junior developers.
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Full Stack Developer
10/2020 – 07/2023 | Oslo, Oslo, Norway
LANARS
Optimized caching with Redis and improved real-time data exchange using a custom socket library, reducing application
downtime from 5 seconds to 1 second in the patient management system, boosting responsiveness and user experience.
Built a HIPAA-compliant patient management system with Python and FastAPI, implementing secure data protocols that led
to a 40% increase in registration efficiency and a 30% reduction in appointment scheduling time.
Led a UI/UX redesign for web and mobile apps using React, React Native, and Tailwind CSS, resulting in a 30% increase in
user engagement and a more intuitive interface.
Enhanced database performance by deploying optimized DataMarts with SQL Server, reducing report generation time by 30
seconds and enabling faster decision-making.
Championed DevOps best practices by automating CI/CD pipelines with Azure DevOps, streamlining workflows, reducing
manual intervention, and speeding up release cycles by 25%.
Developed scalable microservices architectures with Node.js, FastAPI, and Docker, ensuring maintainability and high
availability; utilized Kubernetes for improved deployment and resource use.
Integrated third-party APIs and payment gateways, and developed middleware for authentication and security compliance,
enhancing user experience and system integrity.
Drove architectural improvements using Kafka and RabbitMQ for event-driven systems, enabling asynchronous data
processing and real-time analytics across distributed services.
Implemented AI-driven solutions using OpenAI's GPT models to enhance automation, customer support, and content
generation, increasing operational efficiency and engagement.
Built intelligent chatbots using OpenAI APIs, improving customer interactions and reducing response times by 40%.
Developed AI-powered recommendation systems that enhance user experiences, leading to a 25% increase in engagement.
Implemented monitoring with Prometheus, Grafana, and the ELK Stack, enhancing observability, identifying performance
bottlenecks, and reducing downtime through faster incident resolution.
Effectively translated complex technical solutions into clear, actionable insights for non-technical stakeholders, ensuring
alignment between business objectives and technical implementation.
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Frontend Web Developer
03/2019 – 08/2020 | Oslo, Oslo, Norway
CatWare
Translated business requirements into technical specifications, helping developers align features with client needs.
Developed and maintained scalable RESTful APIs for web and mobile clients using Laravel.
Created reusable UI components using Bootstrap and Material-UI, accelerating development time by 30%.
Improved client-side performance through lazy loading, code splitting, and React Suspense, enhancing load speeds.
Developed scalable RESTful APIs with Express.js, reducing response times by 40% and improving backend efficiency.
Implemented JWT authentication for secure API access and enhanced user session management.
Designed and enforced JWT-based authentication and Role-Based Access Control (RBAC) to strengthen application
security.
Deployed applications using CI/CD pipelines with GitHub Actions and Docker to staging and production environments.
As a Frontend Developer, delivered applications using Angular.js and React.js with 98% UI consistency across devices and
browsers, improving user experience and reducing design-related bug reports by 25%.
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Junior Web Developer
11/2015 – 02/2019 | Oslo, Norway
CatWare
Ensured 95% design-to-development consistency by translating UI/UX designs into fully functional websites using HTML,
CSS, jQuery, Bootstrap, and responsive design principles for optimal cross-device performance.
Led requirements gathering sessions with cross-functional teams, improving feature clarity and accelerating project delivery
times by 15%.
Implemented advanced UI effects, animations, and custom plugins using jQuery, boosting site interactivity and driving a
20% increase in user engagement.
Converted Figma designs into reusable React.js components, achieving 95% design accuracy and improving development
efficiency for future projects.
Built 150+ pixel-perfect HTML pages using pure CSS and JavaScript, delivering seven customizable themes and reducing
design inconsistencies by 30%.
Optimized DOM manipulation and AJAX calls with jQuery selectors, improving page responsiveness by 20%.
Developed secure backend APIs using Laravel and MySQL, supporting key features and enhancing data processing
capabilities.
Conducted code reviews to ensure code quality, maintainability, and compliance with best practices.
Applied advanced debugging techniques to resolve critical software issues, reducing bug resolution time by 25%.
Executed performance optimization strategies including lazy loading and caching, enhancing application responsiveness and
reducing load times by 20%.
Configured Webpack for optimized asset bundling and streamlined deployment processes, improving release efficiency.
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Education
Bachelor's Degree of Computer Science
Kristiania University College
Languages
Norwegian
English
08/2015 – 07/2018
