Marcin C.

Marcin C.

Backend Developer

Top performer 8.5/10
Spain
Trusted member since 2022
10 years of experience

Throughout his career, Marcin has collaborated with Proxify clients on high-impact projects, consistently delivering reliable and effective solutions. He excels at designing robust, scalable, and maintainable software systems, applying SOLID principles and design patterns to transform product requirements into high-quality, extensible solutions.

Main expertise

.NET.NET10 years
C#C#10 years
.NET Core.NET Core8 years
API10 years
26+

Experience8

Proxify AB

Solution Architect / Tech Lead

Proxify AB
HR and Recruitment
Jun 2023 · 3y 4m
  • Designed and implemented comprehensive infrastructure in Azure, enhancing scalability and performance.
  • Developed and maintained efficient CI/CD pipelines in Azure DevOps, streamlining the development process.
  • Led the migration of a legacy WinForms project to .NET MAUI, modernizing the application and improving cross-platform compatibility.
  • Implemented robust logging systems and usage data collection mechanisms to gather valuable insights.
  • Created a web application to visualize and analyze statistics from collected data, improving decision-making processes.
  • Managed the end-to-end development lifecycle, from infrastructure design to application deployment and monitoring.
Azure Blob storageAzure Blob storage
.NET Core.NET Core
BlazorBlazor
API
Azure Web AppAzure Web App
.NET MAUI.NET MAUI

Senior Software Developer

Proxify (EyeC GmbH)
Information Technology (IT) and Services
Dec 2022 - May 2023 · 5m
  • Developed and maintained CI/CD pipelines for Kubernetes-based microservices.
  • Implemented monitoring and alerting systems using Prometheus and Grafana, which reduced downtime.
  • Managed infrastructure using Terraform and Docker.
DockerDocker
KubernetesKubernetes
GrafanaGrafana
TerraformTerraform
.NET Core.NET Core
Sword Group

Azure Solution Architect / Engineer

Sword Group
Information Technology (IT) and Services
Oct 2022 - Jan 2023 · 3m
  • Built and managed Azure DevOps pipelines for CI/CD and release management workflows.
  • Created dev/test/prod infrastructure as code using Azure CLI and related deployment tools (Bicep).
AzureAzure
.NET.NET
Azure QueueAzure Queue
DevOpsDevOps
API

Senior Software Developer (Contract)

Hedder, London
Information Technology (IT) and Services
Jul 2021 - Apr 2022 · 9m
  • Served as a key developer in the Scrum team, planning and reviewing sprints and conducting agile retrospectives based on captured metrics and measurables.
  • Architected, designed, and implemented highly scalable back-end Web APIs in Azure cloud using Azure Functions, Azure Search, Azure SQL, SignalR, Azure Service Bus (MassTransit), and Azure Static Web Apps.
  • Designed and implemented front-end components using React according to strict UX and code-quality requirements, with MobX for state management and React Query for data synchronization.
  • Crafted the UI using Material UI and Flex, applied Design Tokens and Storybooks, and achieved high test coverage with Jest and Cypress.
  • Upgraded the back-end solution from .NET Core 3.1 to 6.0 and Entity Framework Core 6.
  • Implemented CI/CD pipelines, infrastructure-as-code, and automated integration testing tools.
  • Optimized API requests and SQL queries and implemented server- and client-side caching.
  • Replaced Microsoft Azure B2C with an Identity Server provider using OpenID Connect and OAuth 2.0 protocol.
SQLSQL
AzureAzure
.NET.NET
MobXMobX
.NET Core.NET Core
5+

Senior Software Developer (Contract)

CBRE, London
Real Estate
Feb 2019 - Jun 2021 · 2y 4m
  • Architected, designed and extended the Azure PaaS architecture to support new features, using Azure Functions, Azure Service Bus, Event Hub and Event Grid, ensuring elastic scalability, availability and reliability under intense load and usage peaks of up to 100k users.
  • Designed and developed a world-leading, enterprise-level Data Centre Risk Management and Reduction system, rolled out globally across all data centres for the world's largest commercial real estate corporation, reducing the risk of mechanical, electronic, process and human failure and reducing unplanned incidents closer to zero using predictive analytics.
  • Increased developer productivity and experience by configuring and maintaining the build and release pipelines as code, infrastructure-as-code using ARM templates and zero-downtime deployment of the distributed infrastructure to multiple paired regions for disaster recovery and resiliency.
  • Designed a highly efficient data architecture using Cosmos DB through effective partitioning, geo-replication, multi-master consistency model and heavy use of Change Feed to build materialised views, data aggregations and replications.
  • Improved Code Coverage by coaching the development team on coding practices such as TDD, Unit and Integration Testing, Load Testing and automated UI testing, integrating testing into the CI/CD pipelines to ensure code quality, stability and the ability to fail fast.
  • Built an internal tool utilizing Vue.js, using Pinia for state management.
Vue.jsVue.js
MongoDBMongoDB
AzureAzure
.NET.NET
Azure Blob storageAzure Blob storage
3+

.NET Developer

White-Springs, Banbury
Information Technology (IT) and Services
Oct 2016 - Feb 2019 · 2y 4m
  • Developed multi-tenanted CRM system using React, Node.js and Microsoft stack in collaboration with global Sales Performance Improvement organisations, reinforcing Sales Training through development, enablement and assessment of sales teams.
  • Designed and implemented advanced licence usage and analytics platform from scratch, capturing stakeholder and product owner requirements using big data and Salesforce integration to produce a system to drive adoption and increase sales and revenue.
  • Modernised and integrated a suite of disparate, legacy Sales Training systems into a cutting-edge, intelligent and predictive Sales platform used by over 18,000 end users daily.
  • The designed SQL database schema, normalised beyond the third standard form, implementing and optimising stored procedures using advanced query optimisation techniques.
  • Automated core development, test and deployment processes using CI/CD pipelines in Azure DevOps.
Angular.jsAngular.js
React.jsReact.js
Node.jsNode.js
SQLSQL
AzureAzure
4+

.NET Developer

Next-Soft, Wroclaw
Information Technology (IT) and Services
Aug 2014 - Sep 2016 · 2y 1m
  • Designed and implemented greenfield business applications in ASP.NET and Javascript with REST web services and a SQL 2014 database for several SME, corporate and governmental end clients, working to strict deadlines, data security, scalability and performance requirements.
  • Conducted regular demonstrations, reviews and planning meetings with key clients.
JavaScriptJavaScript
MSSQLMSSQL
SQLSQL
ASP.NETASP.NET
REST APIREST API

.NET Developer

Freebets4all
Sports
Aug 2012 - Sep 2016 · 4y 1m
  • Worked alongside the technical director and business development manager to design and architect the UK’s leading matched betting strategy portal from conception.
.NET.NET

Engineering excellence

All Backend Developers who have applied to Proxify are scored from 0 to 300 on engineering excellence, one of the five parameters we evaluate. This score reflects engineering excellence only, based on interviews, take-home assignments, live coding sessions, and/or on-the-job performance reviews. The curve shows how all evaluated Backend Developers are distributed across that range, where our acceptance threshold for this parameter sits, and where Marcin stands.

050100150200250300Engineering excellence scoreShare of engineersmedianmeanProxifyacceptancethreshold
Marcin
Score 265 · Top 0.5% of engineers

Education

Nottingham Trent University
Nottingham Trent University
Multimedia Engineering2012 - 2014
Nottingham Trent University
Nottingham Trent University
Computer Science2008 - 2012

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