Savvas Kefalas

Address: 24 Xeniou Dios street, Peraia
ZIP: 57019
Phone: 6948 764320
Mail: savvaskef@outlook.com
Personal site: https://savvas-kefalas.gr

Nationality: Greek

BirthDate: 09/07/1978

MotherLanguage: Greek | Languages: English - business jargon

Driving License: B class (car)

Military Obligations: Completed

Capability to Travel: Yes

If you read an outdated OR incomplete version of the CV, you can always get the latest AND full version from: https://savvas-kefalas.gr/lastCVs/Savvas_Kefalas_CV_English.html

If you read the CV sequentially you might notice gaps in time. As an unemployed i spend time doing some freelancing parallel to honing skills and working\studying on apps that require tech savviness and business\economics acumen.These apps include project management, cash accounting, KPIs, forecasts. You may find details on the second section of work experience!

Work Experience (Full-time\project-based)

Full Stack \ Laravel Developer 2025-2026
SpitiXorisMesiti.gr
Employer's Industry: Online Real Estate Ads
Implementation&Technologies:
Claude Code(context,skills,agents) Laravel7.x Framework Php 7.2 MySql Modern Javascript
Deliverables\Tasks: as the developer of a team, I..
  • Updated the tasks' pipeline by calibrating Claude code for smoother developing.Now tasks are unit-tested and documented automatically.Also we designed prompt engineering for users in order to paraphrase and personalize their searches(a text paragraph).
  • Upgraded (multi-purpose) communications with an email marketing system that, either periodically or per event, populates templates with data from the database and sends emails to users\owners.
  • Made (some crucial) improvements on UD\UX responsive Front-end(.js\.css)
  • Acellerated the MySql database (achieving ~8x)
  • Created Laravel Middleware for Auditing, Performance tracking and Sanitization
  • Cooperated with admin to run database tasks and scheduled(cron) jobs
  • Created live dashboard for most of the management’s needs
  • Created Services to exchange information with other APIs like ERPs, Banks, Google analytics, ReCaptchas
  • Created Google\Facebook events for ads and analytics
Analyst 2025-2026
SpitiXorisMesiti.gr
Employer's Industry: Online Real Estate Ads
Implementation&Technologies:
Laravel7.x Javascript Datatables\Filters Javascript Canvas Regression KPIs\KRIs
Deliverables\Tasks: Supported Decissions.
as the analyst of a team, I..
  • Created,Used,Corrected & Enriched (feature lifecycle) interactive Dashboards for stakeholders and decission makers
  • Appended the database with daily collected of Performance Indexes (KPIs\KRIs) for the health of the software and the business.
  • Time aggregation, trends and\or Growth Index of these are to be displayed in the dashboard...but were ALSO used as inputs (timeseries) to more advanced models created with the help of claude\copilot and 1) RStudio 2) Excel and 3) Realstats.xlam for presentations to VCs and investors
Tech expert\Full time employee 2021
Blue Titans Hospitality
Employer's Industry: Tourism-Short term rental
Implementation&Technologies:
Monday VBA MS-Office Google-Office
Deliverables\Tasks:rotine work AND in-house apps
  • Besides, daily routine(Monday, Slack, b&b Platforms) I developed some in-House Apps for:Warehouse Monitoring app for Amenities with Lots, Fifo, Multi-StockKeepingUnits (MS-Acccess) and decentralized data entry form (Google Sheets) Automated Email Sending in a cleaning service firm whenever bookings occurred that changed the schedule (With periodic check for new bookings in our calendar-sync-provider software (which is a site that offers Web API data access service).It was done with the help of PowerQuery in MS-Excel)
Tech expert 2021
Blue Titans Hospitality
Employer's Industry: Tourism-Short term rental
Implementation&Technologies:
VBA MS-Office Google-Office PowerQuery Google Data Studio
Deliverables\Tasks: Supported Decissions
as a tech expert of the team I..
  • .. analysed peak season revenue with summary tables, descriptive statistics, histograms with classes for numerical data (added 3 KPIs to the existing table) and charts for non-numeric data. Clusters and trends or normality were not detected .
  • .. data-crunched Google analytics data( users, views, sessions) across suggested dimensions like psychographics, demographics, technologies, etc
  • .. used Google Data Studio to create a 4-page report\dashboard with maps, graphs with both short-term and long-term focus.
Programmer 2015
MIK3
Employer's Industry: Contracts
Implementation&Technologies:
MS-SQL database MS-Word
Deliverables\Tasks: Complete Project
  • Application to fill in database data on MS-Word files
Programmer 2015
Assel(interview projects)
Employer's Industry: Learning&Multi-media
Implementation&Technologies:
compact MS-SQL .sdf database C#
Deliverables\Tasks: complete Project
  • Spot the differences Player(plays)\Editor(uploads differences for player) version
  • Word guess games (Hang-man)
Programmer 2014
Mik3 on behalf of Amstel(PoC)
Employer's Industry: Brewery
Implementation&Technologies:
Bing Maps C# permutations hierarchical clustering
Deliverables\Tasks: complete Project
  • A schedule for Amstels Salesmen. A clustering and routing PoC was developed. Periodic visits, Working hours constraints and time spend on each point-of-sales made the project more challenging
Programmer 2014
Artefact
Employer's Industry: Creative technologists
Implementation&Technologies:
Bootstrap Wordpress WP_Queries Q&A plugin php
Deliverables\Tasks: complete Project
  • WordPress BLOG portal for start-up support Website for an entrepreneurship hub:Developed pages for hosting videos, Questions & Answers discussions, Self-Assessment questionnaires and security that allows only entrepreneurs-users access to some services
Analyst 2013
i4g Consultants
Employer's Industry: Consultants
Implementation&Technologies:
Economic research Mode of entry Excel Ranking & Solver
Deliverables\Tasks: Suggest countries and mode of investment for a software
  • Comparison of countries for potential investment Choice of countries and mode of investment for a piece of software calculating dimensions for engineers on behalf of 3p software. Implementation with several ways to weigh and combine criteria and solve for amount of investment,ad expense, and mode of entry.
Web developer 2012
Artefact
Employer's Industry: Creative technologists
Implementation&Technologies:
php MySQL jQuery (Tiny MCE,LightBox)
Deliverables\Tasks: complete Project
  • Mini-CSM Development of viewer-editor for pictures portfolio. Components of the viewer-editor app, which acts like a Content Management System, included .html blocks, images, links, quotes
Programmer 2011-2013
for Mik3 for small teamwork projects
Employer's Industry: Information systems
Implementation&Technologies:
ASP.MVC Crystal reports C#
Deliverables\Tasks: Research\Comparison of technologies and implementation
  • R&D for AudioStreaming & crossfade,
  • WebSite reports with ASP MVC, C# applying CrystalReports & the (innovative then)JQuery
  • ErrorHandling dll for Greek,unified & friendlier messages from Sql server and Oracle[1]
Junior analyst\Developer 2008-2009
for Mik3 on behalf of DODONI
Employer's Industry: Software Solutions
Implementation&Technologies:
Excel forecast functions pivot tables 95%CIs
Deliverables\Tasks: Forecasts@Pivot
  • Forecasts Statistival estimate of forecast (trend+seasonality) including best-worst scenarios for all of the columns of a pivot table.Columns are respoinsive to the user while row-months are fixed
Junior analyst\Developer 2007-2008
ANELPA
Employer's Industry: Brand Development for restaurant & cafes
Implementation&Technologies:
Excel Access
Deliverables\Tasks: In-house apps
  • In-house apps Store viability and profitability estimation
  • Break-even analysis in Excel
  • Asset Depreciation in ms-Access
  • Data Consolidation & Pivot Table unifying workbooks based on file search(ie coming from the same template)
  • MRP:FoodCost calculation & estimation of raw material needs(given Bill of Materials) from past consumption(ie for control purposes) or forecasted consumption(ie to purchase according to forecasted needs)
Junior analyst\Developer 2007-2008
for Vimelia
Employer's Industry: Winery & Liquor store
Implementation&Technologies:
Excel ERP backend
Deliverables\Tasks: Calculate prices,update catalog & Verify effect
  • Prices set (Cost plus) for the whole price catalog Created %margin verification spreadsheet with effective price rather than catalogue price(which is affected by, for example, discounts,offers,etc) .
Administrator assistant 2000
for MIK3 for Fournos Sto Limani SA
Employer's Industry: Bakery chain stores
Implementation&Technologies:
DB2 OS-400 DCW win-based GUI
Deliverables\Tasks: Installing ERP(a change management experience)
  • Data entry of t-accounts structure Design of ANSI SQL querys,. Customization of ERP Using OS/400 Hardware and DCW software.
Developer 1997-1998
for Lidl
Employer's Industry: Discount stores
Implementation&Technologies:
Lotus Notes
Deliverables\Tasks: complete Project
  • Establish Document Flows given a job hierarchy with approvals and feedback loops centralizing and unifying anything from chat to signed documents like a budget.

Work\Study on software projects

For each of the following projects there exist Marketable demos

fortuneTeller Software 2022-2023
User role:Project manager,Project planner,CFO,CIO
Implementation&Technologies:
C# Excel R PowerQuery
Deliverables\Tasks:
  • A C# Project that implements an R-package, called forecastHybrid, to generate and parameterize monthly\quarterly forecasts. The output is historical forecasts(taking into account only the past behaviour and seasonality of the one variable in focus[2] ) that were created with cross-validation and box-cox transformations.The 6 models the package generates as output can be weighed in excel (ie based on the error(actual-forecasted) of each model and have some of the parameters tweaked so that the qualitative expectation of the analyst can be embedded in the ensemble model. Forecasts, aside from being a formal and objective expression of expectations and boundaries of the variable, they can be used in all sorts of foreward-looking optimization[3]
brightProject software 2022-2023
User role: Project manager\Project planner | Position/Role: Developer\Analyst
Implementation&Technologies:
VBA Excel Access GeneticAlgorithms Solver add-in(for HR allocation) Decission tree add-in(for risks)
Deliverables\Tasks: Free sample\demo
  • An Access/Excel application trying to meet an SME’s project planning and management needs without a large/upfront investment. Already in the CHEAP version I implemented: S-curves & Probability of on-time, on-budget completion, project indices: Tolerance/Variance, Earned Value Management. Whereas for the PRO version I extended the model with value-adding functionalities such as: Document and appraise Project(s), Calculation of optimal resource allocation per program (one or more projects), business KPIs/KRIs per activity for stakeholders' needs and target setting on them, Monte Carlo simulation for duration, cost, and indices with set value, compliance checks to the (latest) plan given the risk profiles of all sorts of stakeholders, special functions for time series[4]
budgetCashflows Software 2016-2018
User role: Economist\Business owner
Implementation&Technologies:
C# .NET Outlook Janus Controls Excel Basic Accounting\Economic accumen
Deliverables\Tasks:
  • In the friendly (CHEAP version) of the app, the income-expense ledger is approached by augmenting the windows or office calendar with a single form, Then, the value/monetary (periodic!!!) flow is entered directly onto the calendar/agenda. It allows the following few but rich in information and utility reports:1)Export to Excel Pivot Table & Chart, covering 75% of cash-reporting needs, 2) Forecasts of (filtered) Revenues or Expenses, 3) Break-even point calculation for all cash flows. After a clever intervention, in the PRO version, revenues and expenses, and cash flows and orders tie together allowing: 1) all features of the first version for NET values (inflows outflows per group) since now every order carries the relevant cost and outflows that enabled it, 2) Calculation of ROI per order (and group of orders e.g., product category), 3) Creation of Cashflow Cycle[5] for each group
budget.Indicators software 2022-2023,2026
User role: Business Owners\CEO\CIO\Strategist
Implementation&Technologies:
JS Canvas. HTML 5.0. Node Server.
Deliverables\Tasks:
  • A smaller but potentially more impactful intranet application supporting up to 100 indices selected from a base of >3000 indices (PIs, RIs) for every aspect of the business. These business performance indices (leading), maybe seen by a hierarchy of employees frequently .these are precursors of economic performance indices (lagging \ goals), which are gathered into dashboards that the stakeholders consult less frequently. As for their selection, a survival process is required where some will emerge as Key (the 'K' in KPI) when their predictive capability and ability to transform information into knowledge and action are proven.

Education (Platforms)

Education (Universities)

Skills in Software

Windows /Linux(usage+basic admin concepts)Very good
Visual basic,C# for:Web&Windows appsVery good
Javascript & .js technologies and frameworksVery good
VBA,MS-Office programmingExpert
SharePoint, AzureBeginner
Php7 , LaravelVery good
AI Prompts\Claude CodeVery Good
Analytics: Data factory ,Data studio, Data bricksBeginner
Analytics: Power BI/SQL Server Analysis services ,ExcelExpert
Project management (MS-Project / brightProject)Very good
ERP(KEFALAIO 4,Χ-line)Intermediate
Relational databases, SQL(any form even Big data or SQL ML procedures)Expert
Non relational databasesBeginner
Python Jupyter, Data bricks:Intermediate
Statistics tools: Excel, R, SPSS, Data Tab, RealStatsVery good
Site Dev. CMS (droopal,webmatrix,wordpress)Very good


Skills in CSci\STEM

Analytics: Simulation, Optimizations, Data-mining, Genetic algorithms, Neural networks, Forecasts, Regression(s),Clustering, Classification,Linear programmingExpert
Data science: Multivariate TimeSeries, Causality-Cointegration, Network effects, Data envelops, Factor analysis, SEMGood

Archive(Academic notes\small apps)

GIT Projects

[6] As prerequisites varsions change some functionalities mey not be be up to date and\or they can even be deprecated...

GIT Projects I have completed[6]

Git Projects on comparing Modern JS Frameworks[6]

Footnotes

[1] Even in some simple cases you can spot architectural differences .Not to mention how bigger they get as you approach system\ administration messages

[2] The package evolved into accepting multivariate inputs but they need to be available for both the training and the test set

[3] It’s almost elementary to replace all input data with their forecasts to make an optimization(even if that happens inside the mind of the analyst) forward looking. Business uses of a forecast can be on sales, profits or contribution\attribution to them(ie of a marketing campaign, of a product in a product mix, etc)

[5] The Cash Conversion Cycle (CCC) is a metric that shows the amount of time it takes a company to convert its investments in inventory to cash. (More...)

[6] As prerequisites varsions change some functionalities mey not be be up to date and\or they can even be deprecated If you spot something like that you can ask me about it and I’ll try to bring it back to life. Or even ask about another project .