Creating future-proof
digital solutions in Estonia.
J&L Dev is a Tartu-based technology firm specializing in full-stack development, from high-performance Rust backends to modern React interfaces. We empower businesses via smart automation.
Company Numbers
Comprehensive IT Services
We provide end-to-end IT solutions tailored to your business needs. From custom React frontends with TypeScript type safety to high-performance Rust backends, we deliver scalable systems that support your growth.
Software Development
Custom software solutions, web applications, and systems integration. We use modern technologies to achieve the best results.
- React & TypeScript
- Rust Backend
- Python & Go
- API Development
IT Infrastructure
Data processing infrastructure and cloud solutions management. We ensure system stability and security.
- Cloud Services
- Server Management
- Network Solutions
- Backup Systems
Consulting & Architecture
Strategic consulting in the IT field. We help choose the right technologies and optimize processes.
- Architecture Design
- Security Audits
- Process Automation
- Technical Support
Why choose us as your
technology partner?
Top-tier Security
We implement best practices to protect data and secure systems.
Scalable Solutions
We build systems that grow with your business without interruptions.
Transparent Collaboration
We keep you informed at every stage of development and ensure clear communication.
Technology Stack & What We Build
Expert-level development across modern tech stacks. We specialize in high-performance applications that scale.
React & TypeScript
We build interactive web interfaces with React 18+, TypeScript strict mode for type safety, and modern state management. Typical applications: admin dashboards, customer portals, real-time collaboration tools.
Rust Backend
Memory-safe, high-throughput backends using Tokio and Actix-web. We build APIs handling 10,000+ requests/second with guaranteed memory safety.
Python Development
Rapid development with Python/FastAPI for web services, data pipelines, and automation scripts. We build: machine learning infrastructure, ETL pipelines, backend services, DevOps automation.
Cloud & Kubernetes
AWS and Google Cloud expertise with containerization and Kubernetes orchestration. We design: auto-scaling architectures, disaster recovery, zero-downtime deployments.
PostgreSQL & Databases
Expert database design and optimization. We handle: schema design for scale, query performance tuning, replication and sharding, backup and recovery strategies.
Go Programming
Efficient concurrent services and command-line tools. We build: deployment tools, background job processors, microservices, infrastructure tooling.
E-A-T Commitment
Expertise
17 years of proven experience in software development and infrastructure. Team of specialized engineers with deep knowledge across React, Rust, Python, and cloud technologies.
Authoritativeness
AA credit rating, ISO 27001 certification, GDPR compliance. Published technical articles and active participation in developer communities. Trusted by 50+ enterprise clients.
Trustworthiness
Transparent communication, detailed project documentation, and long-term client relationships. Accountable for results with 99.95% uptime SLA and security audits.
Latest Technical Insights
Explore our latest articles on high-performance engineering, cloud architecture, and digital transformation in 2026.
The Most Active Tech Stack at J&L Dev in 2026
An inside look at the high-performance technologies we are using to build the next generation of digital solutions, from Rust backends to React 19.
Read: Tech Stack 2026Frequently Asked Questions
What technologies do you use?
We primarily use React 18+ and TypeScript for frontend development, ensuring type-safe code and optimal performance. On the backend, we architect systems with Rust for performance-critical components, Python/FastAPI for rapid development, and Go for concurrent services. Our infrastructure expertise spans AWS, Google Cloud, and Kubernetes. This modern stack allows us to build systems processing millions of transactions daily with sub-100ms response times. We choose technologies based on your specific requirements rather than dogmatic preferences, ensuring long-term maintainability and scalability.
Do you provide server management?
Yes, we offer comprehensive infrastructure services including cloud architecture design (AWS, Google Cloud, DigitalOcean), Kubernetes orchestration, database administration, and 24/7 system monitoring. Our infrastructure-as-code approach using Terraform ensures reproducible, version-controlled deployments. We implement disaster recovery strategies with RTO under 1 hour, automated backups, and security hardening. Most clients see 30-40% cost reduction through optimization while maintaining 99.95%+ uptime.
Where are you located?
J&L Dev is based in Tartu, Estonia, operating since 2008 with a proven track record of delivering enterprise-grade solutions. Our Estonian headquarters enables efficient collaboration across European time zones while maintaining EU data residency compliance. Despite our local base, we serve clients globally across North America, Europe, and Asia. Our team of experienced developers and architects work remotely-first, allowing us to partner with organizations worldwide while maintaining the quality standards and personal attention Estonia is known for.
How do you approach software development?
We follow agile methodologies with 2-week sprints, continuous integration/deployment, and test-driven development practices. Every feature includes unit tests (target 85%+ coverage), integration tests, and end-to-end testing with Cypress or Playwright. Code reviews are mandatory before merging, and we use automated linting (ESLint, Prettier) to maintain consistency. We employ SOLID principles ensuring code remains maintainable as complexity grows. Documentation is treated as a first-class concern with API documentation via Swagger and architectural decision records (ADRs).
What is your experience with React development?
We've built numerous production React applications serving millions of users, with deep expertise in performance optimization, state management (Redux, Zustand, Context), and modern patterns like React Hooks. Our React SPAs typically achieve 90+ Lighthouse scores through code-splitting, lazy loading, image optimization, and minimal bundle sizes. We implement comprehensive testing with Jest and Vitest for unit tests and Cypress for E2E tests.
Can you handle Rust backend development?
Yes, Rust is a core competency for performance-critical components. We've built high-throughput APIs achieving 10,000+ requests per second per server, data processing pipelines handling terabytes of data, and real-time systems with guaranteed memory safety. Rust's type system and ownership model eliminate entire classes of bugs (null pointer exceptions, data races) that plague other languages. We use frameworks like Axum, Tokio, and Actix-web for web services, sqlx for type-safe database access, and serde for efficient serialization.
How do you ensure security?
Security is embedded throughout our development lifecycle. We conduct threat modeling during architecture design, implement OWASP Top 10 protections (authentication, authorization, input validation, encryption), and perform security code reviews. Our infrastructure includes DDoS protection, Web Application Firewalls (WAF), and network segmentation. We maintain GDPR compliance with data minimization, encryption at rest and in transit, and documented data processing agreements.
What's your typical project timeline?
Most projects range from 4-16 weeks depending on complexity. We use agile methodologies with 2-week sprints allowing for course correction and feedback integration. A typical SPA development spans 8-12 weeks including discovery (2 weeks), design (1-2 weeks), development (4-6 weeks), testing (1-2 weeks), and deployment (1 week). Infrastructure projects often move faster—we've deployed production Kubernetes clusters in 2-3 weeks.
Do you provide ongoing support after launch?
Absolutely. We offer multiple support models: break-fix support (hourly or project-based), managed support packages (retainer-based with guaranteed response times), and full DevOps management. Our managed support includes 24/7 infrastructure monitoring, proactive security updates, performance optimization, and capacity planning. We maintain detailed runbooks and documentation ensuring knowledge isn't siloed.
How do you handle scalability?
Scalability is engineered from day one, not bolted on later. We architect stateless application servers enabling horizontal scaling with load balancers (NGINX, HAProxy) distributing traffic. Databases use replication and sharding for scale—read replicas handle reporting queries while writes go to primaries. Caching layers (Redis, Memcached) reduce database load by 70-80%. Asynchronous job processing with message queues (RabbitMQ, Kafka) decouples components enabling independent scaling.
What programming languages do you know?
Our core expertise includes JavaScript/TypeScript (frontend and Node.js backend), Rust (performance systems), Python (data processing, automation, ML-adjacent work), and Go (concurrent services, CLI tools). We're experienced with Java/Kotlin for enterprise systems, PHP for legacy modernization, and shell scripting for operations. Each language has specific strengths—we choose based on requirements, not preferences.
Can you help with cloud migration?
Cloud migration is a specialty. We've successfully migrated 50+ applications from on-premises or legacy cloud providers to modern architectures. Our typical approach: assess current systems and dependencies (2 weeks), design target architecture on AWS/Google Cloud (1-2 weeks), set up CI/CD pipelines for automated deployment (1 week), migrate data with zero downtime (1-4 weeks), validate and optimize (2 weeks).
How do you price your services?
We offer flexible pricing models: fixed-price projects (for well-defined scope), time-and-materials (for discovery and exploration work), and retainer arrangements (for ongoing support). Our rates reflect Eastern European efficiency balanced with Western quality standards—typically 20-30% lower than Western European firms while maintaining equivalent expertise. Retainers typically start at EUR 2,000/month for basic support.
What's your company history?
J&L Serverid OÜ was founded in 2008 by experienced developers passionate about building reliable systems. Over 17 years, we've grown from a small startup to a team of 10+ engineers serving clients across Europe and beyond. We maintain AA credit rating and 100% Estonian capital ownership, giving us strong financial stability. Our long-term clients include Estonian enterprises, European SaaS companies, and international startups.
Do you do legacy system modernization?
Yes, we specialize in modernizing legacy systems. We have migrated systems built on older technologies to modern platforms, improving performance and security. For example: we migrated a monolithic Django system to a Rust microservices architecture, reducing resource usage and improving response times.
How do we start?
To start, send us an inquiry directly to [email protected] or fill out the contact form. We will arrange an initial consultation where we discuss your requirements, budget, and timelines. Then we prepare an initial proposal and a roadmap for launching the project.
Contact Us
Do you have an idea or need technical help? Write to us and let's find the best solution together.