What is TechInPractice?
TechInPractice is a free, community-driven platform where senior software engineers share the domain knowledge that took them decades to accumulate — so that developers, architects, and students do not have to spend years figuring it out the hard way.
Every article, every system overview, every business flow diagram on this site comes from real experience in real companies. Our goal is simple: help you understand not just how to write code, but what that code is actually doing inside the organisations that depend on it.
The Problem Nobody Talks About
Every year, thousands of developers enter the industry with solid technical skills and immediately hit a wall that has nothing to do with coding. They know JavaScript, they know SQL, they know how to build REST APIs — but they have no idea what a policy endorsement is, or why a bank needs a separate nostro account, or what the difference is between an admission and a registration in a hospital system.
This knowledge does not appear in any computer science curriculum. It is not in any YouTube tutorial or online bootcamp. It lives in the heads of people who have spent ten or fifteen years working in a specific industry — and it gets passed down informally, through years of sitting next to the right people and asking the right questions.
TechInPractice is our attempt to change that. We pull this knowledge out of the heads of experienced practitioners and put it somewhere that anyone can access — structured, searchable, and free.
You can build a microservice — but do you know why insurance policies have endorsements and how they affect premium recalculation?
You can design a database schema — but do you know why core banking systems maintain a shadow ledger alongside the main ledger?
You can write an integration test — but do you know what happens in a healthcare prior authorisation flow and where it typically breaks?
You can optimise a slow query — but do you understand why supply chain systems recalculate ETAs differently for air freight versus ground?
What TechInPractice Is
Domain Knowledge First
Every topic on TechInPractice starts with the business question: what problem does this system actually solve, and for whom? We explain the business context before we touch any code. The architecture, the APIs, the database design — all of it makes more sense once you understand what the system is trying to do from a business perspective.
Real Production Systems
Nothing here is invented for demonstration purposes. Every system described on TechInPractice — from core banking to pharmacy benefit management to logistics fleet tracking — is based on systems that exist and run in real companies. The problems, the trade-offs, the edge cases: they all come from actual production experience.
Senior Developer Perspectives
The people who contribute to TechInPractice have typically spent 15 to 25 years working across multiple industries. They have been through the acquisitions, the system migrations, the regulatory audits, the production outages at 3am. That experience is hard to get from a textbook, but it is exactly what we try to capture and share.
Living Knowledge Base
Industries do not stand still, and neither does TechInPractice. New regulatory requirements change how financial systems are built. Healthcare interoperability standards keep evolving. Payments infrastructure is being rebuilt almost continuously. Our community keeps content updated so that what you learn today is what is actually true in production today.
Structured Learning Paths
Each domain follows a consistent nine-module structure: System Overview, Business Flow, Architecture, APIs and Data Models, Database Design, Production Issues, Debugging Scenarios, KT Notes, and Interview Prep. This consistency means once you learn one domain in depth, you know exactly how to navigate any other domain on the platform.
Community-Driven
TechInPractice is not maintained by a single editorial team. It grows through the collective experience of practitioners from across industries — developers, architects, analysts, and domain specialists who share what they have learned and correct what is outdated. The more people contribute, the better it gets for everyone.
Who This Is For
TechInPractice is useful for anyone who builds, designs, or works with software systems professionally — at any stage of their career.
Students & Fresh Graduates
Most computer science degrees do a good job teaching you data structures, algorithms, and how to write clean code. What they rarely cover is the industry context — what a policy lifecycle is, how a bank reconciliation actually runs, or why a hospital needs an ADT system separate from its EMR. When you join a company for the first time, there is a steep onboarding curve that has nothing to do with your coding skills. TechInPractice exists to flatten that curve before you even walk through the door.
- ✓Understand what the code you write actually does inside a real business
- ✓Learn the terminology interviewers use when assessing domain fit
- ✓Walk into your first KT session already knowing the vocabulary
Software Developers
If you have been working in the same company for a few years, you probably know your own systems well. But move to a new project — say, from a logistics firm to a health insurance company — and suddenly you are rebuilding domain context from scratch. TechInPractice gives developers a structured way to understand any industry quickly, so the time between joining a new project and becoming genuinely productive drops from months to days.
- ✓Deep-dive into production systems in your current or target domain
- ✓Understand how business rules drive technical decisions
- ✓See real debugging patterns and production failure scenarios
Solution Architects
You cannot design a claims adjudication system without knowing what claims adjudication actually means in the business context. Good architecture is not just about patterns and scalability — it is about understanding why the business needs things to work a certain way. Regulatory constraints, audit requirements, settlement timelines, reconciliation cycles — these all have direct consequences on your technical decisions. TechInPractice gives architects the domain depth they need to make better design choices.
- ✓Cross-industry architecture patterns grounded in real business constraints
- ✓Understand why data models are shaped the way they are
- ✓Learn how legacy mainframe systems coexist with modern microservices
Domain Switchers
Switching industries is one of the hardest career transitions in software. Every domain has its own vocabulary, its own regulatory landscape, its own "obvious" assumptions that nobody writes down because everyone already knows them. A developer moving from e-commerce into core banking is not just changing the tech stack — they are changing the entire mental model of how money, identity, and transactions work. TechInPractice is the structured ramp-up guide that makes this transition far less painful.
- ✓Structured domain onboarding guides for 11 industries
- ✓Terminology glossaries that explain the why, not just the what
- ✓Understand the regulatory and business context behind design decisions
Interview Candidates
Senior engineering interviews at most companies go well beyond algorithms. They test whether you understand the domain you will be working in. "Walk me through how a claim is processed end to end." "What happens when a payment fails midway through a settlement?" "How does an EMR handle medication reconciliation?" These are real questions that real interviewers ask, and they are very hard to answer if you have never worked in that industry. TechInPractice prepares you for exactly these conversations.
- ✓Domain-specific Q&A written at the depth senior interviewers expect
- ✓System design scenarios rooted in real business problems
- ✓Worked examples of production incidents and how they were resolved
Business Analysts & PMs
The best BAs and PMs are not just good at writing requirements — they understand the technical reality of what they are asking for. When you know that adding a new field to a claims form has downstream consequences on adjudication rules, settlement calculations, and regulatory reporting, you write better requirements and have more productive conversations with your engineering team. TechInPractice helps you build that technical intuition without needing to become a developer.
- ✓Understand the technical constraints behind common business requests
- ✓Learn how system integrations work so you can write realistic requirements
- ✓Speak confidently with both business stakeholders and engineering teams
11 Industries · 50+ Domains · Growing Every Month
We cover the industries where the majority of enterprise software is built. Content is added continuously as community contributors share their expertise.
Financial Services
Insurance · Banking · Payments · Trading · FinTech
E-commerce & Retail
Shopping Platforms · Inventory · Order Management · Supply Chain
Healthcare & MedTech
EMR/EHR · Hospital Management · Pharmacy · Telemedicine
Logistics & Supply Chain
Fleet Management · Warehouse · Last-Mile Delivery
Telecom & Media
Billing Systems · Network Management · Streaming Platforms
Government & Public Sector
Tax Systems · Citizen Services · Digital Identity
EdTech & Learning
LMS · Assessment · Certification Systems
Real Estate & PropTech
Property Management · Mortgage · Title Systems
Travel & Hospitality
Booking Engines · PMS · Loyalty Programs
Manufacturing & IoT
MES · ERP · Predictive Maintenance
Energy & Utilities
Smart Grid · Metering · Asset Management
How the Learning Structure Works
Choose an Industry
Start with an industry that interests you or is relevant to your current job — Financial Services, Healthcare, E-commerce, and more.
Select a Domain
Within each industry, choose a domain — for example, Insurance within Financial Services, or E-prescriptions within Healthcare.
Pick a Sub-Domain
Narrow down further — within Insurance, choose Health Insurance, Life Insurance, Auto, or Property.
Explore the Systems
See all the production systems in that sub-domain — Claims Management, Policy Administration, Provider Network, Billing, and more.
Learn in 9 Structured Modules
Each system teaches: System Overview → Business Flow → Architecture Diagram → APIs & Data → Database Design → Production Issues → Debugging Scenarios → KT Notes → Interview Questions.
A Community That Grows Through Shared Experience
TechInPractice is not maintained by a single team of writers producing content on a schedule. It grows through the real experiences of people who have actually worked in these industries. A developer who spent eight years in health insurance knows things about claims processing that no amount of research can replicate. A payments engineer who has debugged settlement failures at midnight knows things about reconciliation that you will not find in any textbook.
When those people share what they know — even imperfectly, even partially — and when other practitioners from the same industry review and refine it, the result is something genuinely valuable. That is what we are building here. If you have domain experience you think others would benefit from, we would love to hear from you.
11
Industries Covered
50+
Domains & Sub-Domains
9
Modules per System
100%
Free Forever
Ready to Start?
There is no sign-up form, no subscription, no paywall. Pick an industry, pick a domain, and start reading. Everything on TechInPractice is free and always will be.