Available — freelance engagements
Senior Backend Engineer
I build backend systems, APIs and cloud infrastructure for products that need to remain reliable as they grow.
With 10+ years in software engineering, I've worked on financial platforms, business applications, APIs and cloud systems using Go, PHP and Node.js.
Architecture · APIs · Databases · Cloud · Security
Core stack
about
For more than ten years, I have been building backend systems across very different contexts: growing startups, international organizations, established companies. The same standard everywhere — readable, tested code that is still easy to maintain three years after delivery.
Co-founder of three startups, including Everabyte (cloud storage and secured servers), I know what it means for a product to move from MVP to scale: choices made in month 2 are paid for — or pay off — in month 24.
Certified Professional Cloud Architect (IONOS, 2025), I design lean AWS infrastructure: sized for real traffic, documented, and with no surprise costs.
expertise
Six areas that overlap daily — a backend is never designed without its infrastructure.
Microservices, REST and GraphQL APIs, distributed systems. The area where I spend the most time — and the most demanding.
Go · Node.js · PHP · Clean Architecture · DDD
Dockerized deployments, Kubernetes orchestration, AWS infrastructure sized for real traffic.
AWS · Docker · Kubernetes · MinIO · Jenkins
Data modeling, optimized queries, choosing the right engine — relational when needed, caching when it helps.
PostgreSQL · MySQL · MongoDB · Redis · Oracle
OAuth2, Keycloak SSO, security reviews, CI/CD pipelines. I started my career as a security analyst at Orange.
OAuth2 · Keycloak · CI/CD · Git
CTO as a service, from prototype to structured team. Three startups co-founded, including the full MVP-to-scale-up experience.
MVP · Product · Team building
Enough frontend to ship complete products, with a backend engineer’s discipline.
React · Vue.js · Remix · TypeScript
work
Systems running in production today — for international clients and my own products.
Cloud storage & secured servers — founder · 2020 – 2025
A cloud storage platform for businesses: complete distributed architecture, from the authentication service to billing. Design, development, and management of the technical team.
Go · Fastify · Remix · PostgreSQL · Jenkins · Docker
World Bank · UNICEF · UNDP — via Etech Consulting · 2022 – 2024
Fund tracking for international organizations: multi-organization reporting, permission management, traceability requirements. Built in Symfony with an Oracle footprint.
Symfony 5 · Vue.js · Oracle · Docker · Git
Financial transactions, real-time detection
CodeIgniter 3 · Redis · MySQL · PHP
Nutrition data, co-founder & CTO
Laravel · MySQL · Blockchain
REST & GraphQL, OAuth2 via Keycloak
Go · MongoDB · GraphQL · Keycloak
Real-time agricultural plantation monitoring
Node.js · PostgreSQL · React
experience
Eleven years, eight chapters — from security analyst to company founder.
2025 ●
High-performance backend applications in Go. Audits and optimization of existing code.
Go · Fastify · Docker · Kubernetes · AWS
current
2020 – 2025
Cloud storage and secured servers for businesses. Overall architecture, development, team management.
Go · Fastify · Remix · PostgreSQL
2022 – 2024
Financial ERP for the World Bank, UNDP and UNICEF. Anti-fraud system and census platform.
Symfony · Vue.js · React · PostgreSQL · Oracle
2019 – 2021
Nutrition data management with blockchain integration.
Laravel · MySQL · Blockchain
2020
REST and GraphQL APIs in Go, OAuth2 authentication via Keycloak.
Go · MongoDB · GraphQL · Keycloak
2018 – 2019
Technical architecture design and platform development.
Laravel · MySQL · Git
2015 – 2019
Technical team supervision, project management, CRM development.
Node.js · React · Laravel
2014 – 2015
Review of internal systems and hardening of security policies.
Security audit · Training
stack
contact
Freelance engagements, architecture audits or CTO support — describe your context and I will reply within 24 hours with a first technical opinion.
hello@tojorodialson.me