Independent backend developer & technology consultant

I build and improve the software your business depends on

Need someone to step into an existing system, build a backend feature, connect an API or automate a process? I work directly with startups, SMEs and software teams on PHP/Symfony applications, integrations, AI automation and cloud infrastructure.

Backend & web applicationsAPIs & integrationsExisting software & legacy codeAI & workflow automation
Sergio Kachurin

You work directly with the person writing the code

No account managers or unnecessary handoffs. We define the problem, agree on the scope, and I implement the work.

How I can help

Bring me the part of the system that needs to move

A new feature, an unreliable integration, an aging PHP application or a repetitive business process. I can take responsibility for a defined piece of work or join your existing team when you need extra engineering capacity.

01

Build backend features and services

I develop PHP and Symfony backend functionality, business logic, databases and web applications around the requirements of the product and the people using it.

02

Connect systems that need to talk

I build and integrate REST/OpenAPI services with payment providers, analytics platforms, internal systems and third-party applications.

03

Take over and improve existing code

You do not need a greenfield project. I am comfortable entering an unfamiliar codebase, tracing problems, fixing bugs, updating dependencies, refactoring and improving performance without rebuilding everything from scratch.

04

Automate repetitive work

I integrate AI tools and automated workflows where they can remove manual steps, connect existing processes or make internal work faster. I can also improve deployment and cloud infrastructure when it is part of the problem.

Why work with me

Useful when the software already exists and the problems are real

Much of my work has involved production systems that were already running before I joined them. That means understanding somebody else's code, finding what is actually causing the problem, and improving the system without disrupting the business around it.

Development

Hands-on backend experience

I work with PHP applications, backend services, databases, APIs and frontend integrations across new development, maintenance and long-running production systems.

Existing systems

I am used to inherited code

I do not need to have built the original application to work effectively with it. I can investigate how it behaves, identify the part that needs attention and make targeted changes instead of proposing a rewrite by default.

Business context

I look beyond the ticket

My background also includes law and marketing. It helps when technical work involves business rules, documentation, risk, user flows or communication with people outside the development team.

Technology & expertise

The stack I use to get the work done

Core technical areas

PHPSymfony 6/7LaravelDoctrine ORMMySQLDockerREST / OpenAPIVue.jsPiniaTypeScriptJavaScriptGit / GitHub / BitbucketAWSOracle CloudAzureAI-assisted development
Oracle Cloud Infrastructure Certified Foundations AssociateCloud infrastructure fundamentals · 2026
Oracle Agentic AI Foundations (2026)AI agents and modern AI concepts · Oracle University
Digital Marketing StrategyCoursera / HSE · commercial perspective
Legal educationAnalytical, documentation and risk-oriented background
Selected certificates

Some of my recent certificates and professional training

A selection of technical and complementary training alongside my day-to-day software development work.

Oracle Cloud Infrastructure Certified Foundations Associate certificate

Oracle Cloud Infrastructure Certified Foundations Associate

Oracle Cloud Infrastructure certification obtained in August 2026.

Digital Marketing Strategy course certificate

Digital Marketing Strategy

Course authorized by HSE University and offered through Coursera.

Click a certificate to view it at full size.

Ways to work together

Choose the engagement that fits the job

Hourly work from €30/hour. Fixed-price projects quoted after scope review.

External developer

Bring me into your existing development team when you need additional backend capacity without making a permanent hire.

Defined project

Give me a clearly scoped feature, API integration, service, automation or modernization task and I can take responsibility for delivering it.

Recurring maintenance

Keep an existing application maintained, updated and moving forward instead of waiting until technical problems become urgent.

Technical consulting

Use me to review architecture, automation or infrastructure and, where useful, implement the changes rather than stopping at recommendations.

Have a backend, integration or automation problem to solve?

Send me a short description of the system, what is not working or what you want to build. I can tell you where I can help.

Contact me on LinkedIn ↗
Remote B2B collaboration

Talk directly to the developer doing the work

I work remotely with startups, SMEs, software agencies and digital businesses in Spain, across Europe and internationally. Hourly, project-based and recurring collaboration are all possible.

Software developmentBackend & APIsAI automationCloud & infrastructure