SIR SEEngineering, Delivery & Evolving Solutions Company
FR

We design the physical world, and the tools that run it.

SIR SE (Société d'Ingénierie de Réalisation des Solutions Évolutives) delivers civil and water engineering studies in Senegal, West and Central Africa, and builds the business software used to manage them.

Roads, bridges, drainage, water resources, software: describe your project and we will send you a proposal.

Request a quoteWhat we do
Typical longitudinal profile Illustrative technical drawing: a road crosses a valley on a three-span bridge of 25 m spans over a river, with the highest flood level and a box culvert under the road. A table gives ground and design levels by chainage. 182226303438 m grade 0.55 %grade 0.89 %HFL 22.2025.0025.0025.00OA-1 · girder bridge, 3 spansOH-2 · box culvertnatural ground Ground levelsDesign levelsPK33.5034.300+00032.1633.190+20021.8032.200+40019.2532.200+60030.8032.200+80032.8733.811+00035.4035.601+200
Engineer
SIR SE
Disciplines
Civil · Water · Digital
Location
West & Central Africa
Sheet
00 · Overview
Rev.
A · 2026

SIR SE at a glance

Three engineering services and three products. For each one: who it is for and what you get.

7.00
Engineering

Roads & bridges

Designing durable roads and structures, from feasibility to site works.

For whom
Public clients, local authorities, contractors
You receive
  • Study report
  • Drawings & profiles
  • Design calculations
  • Quantities & BoQ
  • Tender documents
See details
2 × 2.00
Engineering

Water engineering

Sizing structures from design flows, and developing water resources.

For whom
Local authorities, road projects, farmers, NGOs
You receive
  • Hydrological study
  • Structure sizing
  • Network drawings
  • Hydrogeological report
  • Pumping tests
See details
FieldDataDecision feedback loop
Digital

Business software

Turning your technical processes into reliable applications.

For whom
Companies, laboratories, public bodies
You receive
  • Custom web application
  • Dashboards
  • Database
  • User training
See details
SoftwareIn development

BTP GES PRO

Run a construction company in one application: management, laboratory and technical design.

For whom
Construction firms, engineering firms, laboratories
What it does
  • Approval workflows
  • Purchasing & cash
  • Laboratory
  • Road design
  • Hydraulics
  • Structures
  • Tenders
See details
SoftwareDecision support

Suivi_Action

Gathers all BRVM information to support decisions. The user remains the sole decision-maker.

For whom
Fund managers, platforms, CFOs, individuals
What it does
  • Prices & indicators
  • Score per stock
  • Explained signals
  • History
  • Does not decide
  • Holds no money
See details
AgritechPrototype in design

Smart greenhouse

More reliable production in a Sahelian climate, by automating ventilation and irrigation.

For whom
Growers, cooperatives, agricultural projects
Purpose
  • Controlled climate
  • Water on demand
  • Remote monitoring
  • Replicable pilot
See details
Track record

They trusted us with their studies.

Structures, roads and hydrogeological studies delivered by SIR SE in Senegal, Togo, Gabon and Benin.

Principle elevation of a 40 m two-span girder bridge HFL 20.00 20.00 Elevation · principle abutment pier RC girder deck river
TogoKpegadjin (Kpégadjé), Haho prefecture · 2015 – 2016

40 m two-span girder bridge

Design and structural sizing: calculations and construction drawings of the reinforced-concrete girder bridge

Client
Midnight Sun, construction company, built the works
Client type
Contractor
40 mlength
2 × 20 mspans
10 mwidth
View project
Typical cross-section of a two-lane road: 7 m carriageway, shoulders, pavement layers and side ditches axis 1.50 carriageway 7.00 1.50 2,5 % 2,5 % wearing course base course sub-base subgrade ditch ditch
GabonRN1 Trans-Gabon highway · Ntoum – Kougouleu · 2020 – 2022

Ntoum – Kougouleu road (RN1)

Design engineer as subcontractor: upgrading the preliminary design (APS) to detailed design (APD), producing all topographic, hydraulic and structure drawings

Client
CEG (Consulting Engineers Group Ltd.), SIR SE as subcontractor
Client type
International engineering consultancy (subcontract)
81 kmof road
94culverts
12 kmof drains
APS → APDstudy stage
View project
Principle elevation of a tall elevated reservoir supply main 12 m tank 1,000 m³ shaft raft Elevated reservoir · principle
BeninSèmè-Kpodji, Ouémé department

Tall elevated reservoirs

Studies and structural sizing of 1,000 m³ elevated reservoirs, 12 m high

Client
Subcontractor to SIGEM SA
Client type
Company (subcontracting)
1 000 m³capacity
12 mheight
View project
Principle hydrogeological section of a buried gas pipeline in a coastal area water table piezometer gas pipe trench clays coastal sands depth to water Hydrogeological section · principle
SenegalNorthern Segment of Senegal's gas network · Léona landfall – Gandon (Saint-Louis)

Northern gas pipeline: landfall – Gandon

Hydrogeological studies of the onshore pipeline route, between the landfall point and the Gandon power plant

Client
Fondasol Sénégal, SIR SE as subcontractor
Client type
Geotechnical engineering firm (subcontract)
85 kmpipeline (project)
40 kmonshore route
GTA → Gandongas hub → power plant
View project

Who we work with

  • Construction contractorsDesign of the structures they build, and the BTP GES PRO management software.Midnight Sun (Togo)
  • Engineering firmsConsultancy or subcontracted studies, supporting their teams.CEG, Consulting Engineers Group (Gabon) · SIGEM SA (Benin) · Fondasol Sénégal
  • Governments, public owners and local authoritiesStudies, works supervision and owner's engineering.
  • NGOs and development projectsWater supply, drainage, hydraulic and agricultural works.
  • Fund managers, platforms, CFOsInformation and decision support with Suivi_Action.
  • Growers and agricultural projectsInstrumented greenhouses, irrigation and sensor monitoring.
The founder

A company backed by thirty years in the field.

Christian Houindo Arcadius

Christian Houindo Arcadius

Founder of SIR SE · Civil engineer with significant experience in integrated water resources management (IWRM)

Civil engineer, graduated in 1996 from the Gamal Abdel Nasser Polytechnic Institute in Conakry, with significant experience in integrated water resources management (IWRM). Thirty years of assignments in West and Central Africa on roads, bridges, drainage and water supply, on both the supervision and the contractor side.

30years of experience, engineer since 1996
6countries: Senegal, Togo, Benin, Niger, Guinea, Gabon
83 bnFCFA of new works over his last 7 years
400+ kmof roads designed or supervised
See the full career
Our platforms

Two applications built by SIR SE.

Screens scroll as in the application. They are real screenshots, not live data.

The whole construction company in one application

Management, purchasing, finance, geotechnical lab, tenders, plus built-in technical modules: road design, hydraulics and structures.

Discover BTP GES PRO
btp-ges-pro / managementreal screenshots
BTP GES PRO : sequence of application screens
Research & prototyping

A greenhouse that manages its own climate and water.

A 15 × 10 m pilot: seven steel frames, motorised vents, three water circuits and software monitoring.

150 m²footprint
7frames
3water circuits
See the greenhouse project
Perspective view of the SIR SE smart greenhouse15 by 10 metre greenhouse with seven steel frames, motorised roof vent, roll-up side vent, four drip-irrigated beds, micro-sprinkler lines, temperature and humidity sensors, water tank with pump, control cabinet and monitoring panel.H₂O15.00 m10.00 mMonitoringsimulated valuesTemperature27.4 °CAir humidity68 %Soil moisture32 %12345678
Perspective view, project in designSE-01

How to start a project with us

From your first request to delivery.

  1. Your request

    Form, e-mail or WhatsApp: describe the project and its location.

  2. Discussion

    We clarify needs, available data and schedule.

  3. Proposal

    Technical and financial offer, listing all deliverables.

  4. Contract

    Signature, agreed schedule, dedicated contact.

  5. Delivery

    Deliverables handed over, presented and supported.

Frequently asked questions

Another question? Write to us.

Where do you work?

In West and Central Africa: we have already worked in Togo, Gabon and Benin, from our head office in Senegal.

How do I get a quote?

Fill in the contact form or message us on WhatsApp with the type of project, its location and available data. We will clarify your needs, then send a technical and financial proposal.

What data should I provide for a study?

Whatever you have: topographic surveys, geotechnical investigations, previous studies, existing drawings. If data is missing, we propose the required surveys.

Can I see BTP GES PRO in action?

Yes, by appointment: we run a demo based on how your company is organised.

Does Suivi_Action manage my money or decide for me?

No. Suivi_Action gathers information and analysis; it places no orders, holds no money and the decision remains yours.

Is the site available in French?

Yes: the FR button at the top of every page opens the French version.

An infrastructure, water or software project?

Tell us what you need. We will come back with an initial technical review and a proposal.

Request a quote
Quote