CivilTech Engineering

Our Team

Corporate Leadership

  • Melvin G. Spinks, PE, CFM

    Melvin G. Spinks, PE, CFM


    Mr. Spinks has 30 years of professional experience in the management and engineering of water resources engineering and civil engineering projects. Mr. Spinks is recognized nationally as a technical expert in hydrologic and hydraulic modeling and risk analysis for complex urban flood control systems. He has managed multi-million dollar federal projects with the U.S. Army Corps of Engineers (USACE) and Federal Emergency Management Agency (FEMA); riverine and coastal studies with the Texas Water Development Board and Texas General Land Office, and over 100 highway and bridge drainage projects with the Texas Department of Transportation; as well as numerous drainage and flood reduction projects for area cities and counties.

    Mr. Spinks has served as a technical expert on litigation cases for water resources engineering issues. He has testified in civil and federal courts as a technical expert including most recently on Hurricane Katrina Flooding in the Lower Ninth Ward in New Orleans, Louisiana. His work has primarily involved technical expertise in hydrologic and hydraulic modeling for complex drainage and flood protection systems.

  • Darrell L. Kaderka, PE

    Darrell L. Kaderka, PE

    Executive Vice President

    Mr. Kaderka has nearly 30 years of structural and transportation engineering expertise, which includes work for the Texas Department of Transportation, Harris County Flood Control, Houston METRO, Harris County Tollroad Authority, the Grand Parkway Association, various city and county agencies and private developers. He has worked as lead project engineer and project manager for projects that include highway design, minor and major bridge design, roadway design, utility relocation, traffic signals and control, port container yard design, and residential development. Specialized structural engineering design includes multi-story post-tensioned parking garages, multi-story steel framed buildings, single-story masonry buildings, bridges, retaining walls, and flood control structures. 

  • Sam Talje, PE

    Sam Talje, PE

    Executive Vice President

    Mr. Talje has more than 33 years of extensive experience in dynamic hydrologic and hydraulic modeling, civil infrastructure design, and capital improvement planning for urban watersheds and transportation improvements. Mr. Talje is a mega project manager who has previously served as Director of the Water Resources Department for the Texas Department of Transportation (TXDOT). He has led, multi-faceted infrastructure projects that combine master planning, design of transportation, hydraulic analysis and drainage design, financial, environmental, major corridor planning and public involvement specialties. Prior project experience includes: Grand Parkway Segments H and I-1 Feasibility Study, Environmental Impact Statement and Schematic Design, IH10 Corridor Planning Feasibility Study and City of Houston Storm Water Management Program / Storm Drainage Program Support (SWMP/SDPS).

  • Amir Mosaffa

    Amir Mosaffa

    Vice President

    Mr. Mosaffa leads our construction services division, inclusive of construction managers, inspectors, and supervisors. He has nearly 30 years experience on the majority of Houston's major thoroughfares. His vast experience includes oversight on IH 610, US 290, IH 10, and SH 249. Prior to joining CivilTech, Amir worked as a construction project supervisor for TxDOT. In this capacity, he was responsible for construction of many significant TxDOT projects. Most recently, Mr. Mosaffa served as a project supervisor for the $900 million dollar construction of the US 290 Corridor. Amir’s work on the US 290 Corridor construction saved TxDOT and taxpayers an estimated combination of $66 million and allowed the job to complete an estimated one year earlier than anticipated.

  • Paul Baxter, PE

    Paul Baxter, PE

    Vice President

    Mr. Baxter has 15 years experience in general civil engineering design including transportation design, municipal design, structural design, hydrology, and hydraulics. His responsibilities include designing and preparing PS&E for highways, bridges, and roadways for clients such as Harris County, the City of Dallas, the City of Frisco, NET-RMA, and TxDOT. Other responsibilities include internal and external project coordination, project scheduling and management, construction estimating and bid preparation, quality control and quality assurance, staff management and development, and business development.

  • Mike McGovern, PE, CFM

    Mike McGovern, PE, CFM

    Vice President

    Mr. McGovern has more than 18 years of engineering and project management experience. He has experience in hydraulic and hydrologic analyses and design, bridge scour analysis, storm water master planning, storm water facilities design, roadway drainage design, and storm water impact analysis. His design experience includes drainage systems for large roadway projects, master planned communities, neighborhood storm drainage systems, local and regional storm water detention facilities, new channels, and channel improvements.He is accomplished with numerous hydrologic and hydraulic computer applications, including, WinStorm, XPSWMM 1D & 2D, EPASWMM, MIKE 11, MIKE 21, HEC-RAS, HEC-HMS, HouStorm, and HY-8. Mr. McGovern is capable in the use of ArcGIS and its extensions ArcHydro and HEC-GeoRAS used to develop hydrologic parameters for modeling.
    Prior project experience includes North Houston Highway Improvement Project Segment 3B Drainage Study, Halls Ahead Watershed Study and Loop 1604 From SH 16 to I-35 Schematic (Drainage) Project.

  • Larry Goldberg, PE

    Larry Goldberg, PE


    Mr. Goldberg has 30 years of project management and civil engineering experience for public infrastructure projects, commercial developments, wastewater systems, drainage systems, roadways, traffic control sequencing, traffic impact analysis, traffic warrant studies, and water distribution systems. Clients include governmental agencies that include city, county and state entities throughout Texas as well as private clients that include major land developers for residential and commercial developments as well as municipal utility districts. 


  • John Perez, PE, CFM

    John Perez, PE, CFM

    Vice President

    Mr. Perez leads CivilTech's San Antonio operations. He brings 35 years of diversified industry experience in the design and management of major highways, urban freeways, multi-level interchanges, and city street projects in Texas. For the Texas Department of Transportation, he has managed and/or designed more than $3 billion in major highway improvements. This includes serving in key roles for some of San Antonio's high profile projects that include the IH 410/US 281 interchange and Loop 1604. Statewide corridors include SH 183, SH 35E, SH 130 and SH 249. John has direct transportation project management experience in feasibility studies, preliminary engineering, advanced planning/route studies, cateogorical exclusions (CE), environmental assessments (EA) and environmental impact (EIS) report preparation; as well as plans, specification and estimate (PS&E) plan development. Further establishing him as a transportation Renaissance man, he has managed major hydrology/hydraulics programs and previously owned a construction management firm.