David Walend
Senior Software Engineer at MacroHealth
Newton, Massachusetts, United States
Summary
👤
Senior🎓
Top SchoolDavid Walend is a Senior Software Engineer and architect with 12+ years of experience building resilient distributed systems in Scala and Java, from military planning and clinical research networks to social network analysis and fintech. He specializes in solving hard problems around unreliable or delayed connectivity, incomplete knowledge, and conflicting goals with limited resources, often converting prototypes into production-grade, cost-effective architectures. At Harvard Catalyst he led the engineering of a scalable distributed query network across 46 hospitals, and at MacroHealth he’s been simplifying and modernizing a complex Scala codebase while mentoring junior engineers. His background spans low-level protocol tuning and high-level system design—optimizing performance, security, and developer workflows—and includes striking wins like reducing ETL times from hours to minutes through concurrent functional designs. Based in Newton, MA, he blends pragmatic engineering with a knack for teaching teams to deliver repeatable, observable systems.
12 years of coding experience
26 years of employment as a software developer
MS Computer Science, MS Computer Science at Tufts UniversityBS Engineering Physics, BS Engineering Physics at Cornell University
Stackoverflow
103reputation
44kreached
2answers
1question
Github Skills (105)
http10
jwt-authentication10
http-client10
client-library10
scala-native10
websocket-client10
java10
scala10
http-server10
slick10
smithy10
robot10
xml10
async9
robotics9
Programming languages (3)
Github contributions (5)
dwalend/blog
Jul 2014 - Jun 2016
Contributions:99 commits, 46 pushes in 1 year 11 months
dwalend/Disentangle
Sep 2013 - Jun 2022
Contributions:576 commits, 226 pushes, 11 branches in 8 years 10 months
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