Bitsquare is a one-person software studio out of Cluj-Napoca, Romania. We build the kind of systems that have outgrown off-the-shelf tools — custom orchestration, distributed queues, deliverability stacks, AI integrations, and the deployment glue around them.
// what we do
Brought in when the obvious solution doesn't scale, the bill stops making sense, or a piece of the system needs to be built from scratch.
NestJS, Laravel, Symfony, Node.js services. Event-driven architectures, REST & RPC APIs, custom queue and job-processor layers built for heterogeneous workloads.
AWS end-to-end (EC2, VPC, target groups), or moving off it. Custom Docker / Compose orchestration with Bash control planes. GitHub Actions, Nginx, deploy pipelines.
High-volume SMTP inbound and outbound. Automated SPF / DKIM / DMARC, reverse-DNS provisioning, IP and domain warm-up & rotation for clean deliverability at scale.
Production LLM features — natural-language flows, structured-data extraction, agentic workflows. MCP server development to expose your product to AI agents.
EVM wallet authentication, wallet-signature cryptography & encryption, basic Solidity contracts, and the backend plumbing that ties them to a real product.
When the cloud bill or DB size has gotten out of hand. Profiling, sizing, cold-data offload, deduplication, and rebalancing — measured in real money saved.
// the stack
Languages
PHP · TypeScript / JavaScript · Node.js · Python · Bash · SQL · Solidity · C++
Backend frameworks
NestJS · Laravel & Nova · Symfony / Sylius · Magento 1/2 · Nuxt · Eloquent · Doctrine · TypeORM
Data & storage
MongoDB · MySQL · Redis · S3
Infrastructure
AWS (EC2, VPC, target groups) · Docker / Compose · Nginx · Apache · GitHub Actions · custom Bash orchestration
Architecture
Microservices · event-driven · queues / job processors · REST / RPC APIs · API security
AI / Web3
LLM API integration · agentic workflows · MCP servers · EVM wallet auth · wallet-signature crypto
// selected work
A sample of what good engineering looks like in production — drawn from senior IC and tech-lead work across the last decade.
EtherMail · Tech Lead
case 01Designed and led the migration off AWS to a custom Docker / Compose cloud, orchestrated by a Bash control plane that selects services per host, isolates scalable workers, and rebalances containers for rough auto-scaling.
EtherMail · Backend
case 02Designed an S3 cold-data offload & deduplication pipeline that collapsed working-set storage from 4–5 TB to 300–400 GB — while keeping query paths transparent to the application.
EtherMail · Platform
case 03Off-the-shelf brokers couldn't account for workers of differing capacity. Built one in-house — distributing work fairly across a fleet that mixes burst, sustained, and IO-bound jobs.
EtherMail · Backend
case 04PHP service (Laravel + Nova with heavy custom work) powering an event-driven rewards and gamification system at a scale most teams reserve for "real" data pipelines.
EtherMail · Cryptography
case 05E2E encryption keyed off the product's EVM identity layer — the wallet signature is the user's identity and the basis for key derivation.
VibeFunnel AI · Backend
case 06LLM-driven page section & lead-magnet generation, multi-step agentic pipelines, plus an MCP server exposing platform functionality to Claude Desktop and other clients.
// about
Bitsquare SRL is a Romanian software company based in Cluj-Napoca, run by a senior backend & infrastructure engineer with around a decade in software and another seven years before that on industrial automation and high-power distribution sites.
The studio model is deliberate: no hand-offs, no juniors learning on your codebase, no agency overhead. You get a senior IC who has shipped the work end-to-end — architecture, code, infrastructure, deployment, and the calls in between.
Currently leading infrastructure at EtherMail, a Web3-native email service, with bandwidth for one or two parallel engagements. Best fit for teams that need senior backend or infra firepower without spinning up a full agency relationship.
Typically fixed-scope projects, retainer for ongoing platform work, or fractional tech-lead arrangements. Always with a written scope and clear deliverables.
Default is remote (CET / CEST). On-site visits in Cluj-Napoca on request, and travel for kickoffs is on the table.
Product teams that have a backend or infra problem too senior for a contractor and too narrow for a full hire — or a founder who needs a senior engineer in the room from day one.
// get in touch
Send a paragraph about what you're building and where it's getting stuck. Replies in one business day.