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Derby, East Midlands, England

Coding classes in Derby

What are the best coding classes in Derby?

Derby counted 261,364 usual residents at the 2021 Census, and children aged 5 to 14 made up a larger share than across England, with 6.5% in each five-year band against 5.9% and 6.0% nationally. The city's Museum of Making stands on what is widely regarded as the site of the world's first factory, at the southern end of the Derwent Valley Mills World Heritage Site. Modern Age Coders teaches Derby learners from six to sixty-seven in live online lessons, one to one or in groups of five to ten at one level, with teachers based in India and times arranged in UK hours. We charge nothing for the first lesson; afterwards a group place is USD 100 and one-to-one teaching USD 150 per month.

How many buses are carrying passengers around Derby at its busiest moment? The Department for Transport's Bus Open Data Service publishes the timetable of every local bus service in England, free and without a licence, so the question has an exact answer. On Tuesday 22 September 2026, 2,595 scheduled trips spend time inside the city boundary. Turn each into a start and an end, sort the 5,190 moments, then walk through them keeping a running count, adding one at each start and taking one away at each end. The highest the count reaches is 109, first at 08:14. That walk is called a sweep line, and it replaces more than 3.3 million pairwise comparisons with a single pass. There is a catch: whether the answer is 109 or 117 depends on one rule about what happens when a trip ends at the very minute another begins. Finding that rule, and stating it, is the lesson Derby's buses teach our teenage learners.

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Facts last verified 21 September 2026. Teaching is online; no Derby branch is claimed.

Course picks for Derby

Four courses for the city of making

Choose from what already interests the learner. Every course begins with a free live lesson, booked without a card.

Elementary Maths for Grades 1-5 course thumbnail
Ages 6 to 11

Elementary Maths for Grades 1-5

Number, shape, time and money for primary years, including the clock and timetable skills that come before counting overlaps.

See the syllabus
 Python for Teens course thumbnail
Ages 13 to 18

Python for Teens

Python from a first line to full projects, with a real timetable file as an early taste of messy data.

See the syllabus
 Competitive Programming for Teens course thumbnail
Ages 13 to 18

Competitive Programming for Teens

Contest problems built on sorting, greedy methods and prefix sums, the toolkit that interval questions draw on.

See the syllabus
 Data Structures & Algorithms Course course thumbnail
University and adult

Data Structures & Algorithms Course

Sorting, hashing, heaps and complexity at interview standard, where event-sorting problems are a staple.

See the syllabus

Browse the course atlas for more than one hundred options and use the coding roadmap to check prerequisites.

The four we are known for

Python, AI, vibe coding and agentic coding

These run underneath everything above. Every one is live and online, placed by ability rather than by age, and the first class is free.

Vibe Coding for Teens course thumbnail
Vibe codingAges 13 to 17

Vibe Coding for Teens

Python, web and AI projects where the learner still owns the thinking.

See the syllabus
 Python Automation Course course thumbnail
Python and AICollege and adult

Python Automation Course

Automate the work you already do, then let AI carry part of it.

See the syllabus
 AI and Machine Learning for Teens course thumbnail
AI and MLAges 14 to 18

AI and Machine Learning for Teens

Train a model, read what it learned, and be able to say why it is wrong.

See the syllabus
 Codex & Claude Code course thumbnail
Agentic codingProfessionals

Codex & Claude Code

Run AI coding agents on real work without losing control of the codebase.

See the syllabus
Derby today

A family city, with more school-age children than the national share

Census 2021 results for the Derby local authority, published by the Office for National Statistics through Nomis.

Derby, Census 2021
MeasureDerbyEngland
Usual residents261,364Not compared
In households256,961, 98.3%Not compared
In communal establishments4,403, 1.7%Not compared
Aged 5 to 916,899, 6.5%5.9%
Aged 10 to 1416,978, 6.5%6.0%
Aged 20 to 2418,528, 7.1%6.0%
Schoolchildren and full-time students, of 246,144 aged five and over55,701, 22.6%20.4%

School-age children

Children aged 5 to 9 and 10 to 14 each made up 6.5% of Derby's residents, above England's 5.9% and 6.0%.

Almost all in homes

Some 98.3% of residents lived in households, and only 1.7% in communal establishments such as halls or care homes.

Students present

In 2021, 22.6% of residents aged five and over were schoolchildren or full-time students, a little above England's 20.4%.

For a coding school, that profile points to families. A Derby household might include a primary child in Littleover wanting to make a first game, a Year 8 student in Spondon weighing GCSE options and a parent in Oakwood who wants to understand what the children are learning, and each of them would join a group at their own level rather than their age.

Making and the factory

Three hundred years of making

From Derby Museums and the Derwent Valley Mills World Heritage Site.

2001

UNESCO inscribed the Derwent Valley Mills and their surrounding landscape as a World Heritage Site that year, because the valley saw the birth of the factory system.

24 kilometres

The site runs 24 kilometres from north to south, from the edge of Matlock Bath and Cromford almost to the centre of Derby.

The first factory

Derby Museums' Museum of Making tells the city's 300-year history of making, on what is widely regarded as the site of the world's first factory.

Derby Museums also says it holds the world's largest collection of works by the painter Joseph Wright of Derby. We have no connection with Derby Museums or the World Heritage Site partnership. We mention them because a factory is, among many other things, a timing problem: machines, shifts and deliveries overlapping through the day. The project on this page is a modern version of the same question, with buses in place of spinning frames.

Where the timetable comes from

The Bus Open Data Service, built by the Department for Transport, provides timetable, vehicle location and fares data for every local bus service in England. It is free open data and needs no licence, which is why a learner in Derby can download exactly the file this project uses.

Signature project

The busiest minute on Derby's buses

A sweep line turns thousands of time intervals into a single running count. We ran one over every scheduled bus trip inside Derby on Tuesday 22 September 2026.

Scheduled bus trips under way inside Derby, Tuesday 22 September 2026, Bus Open Data Service timetable
TimeTrips under wayNote
06:0020Early services
08:00104Morning rise
08:14109Peak, first reached
12:0086Midday
17:0092Evening rise
19:0058Tailing off
22:0020Late services

1. Trips become intervals

Each trip starts at its first timed stop inside the city boundary and ends at its last. On the day, 2,595 trips had at least two such stops.

2. Sort the moments

Every start counts plus one and every end minus one. Sorting all 5,190 moments by time turns the whole question into one pass.

3. Sweep and keep count

Walk through the sorted moments with a running total. Its highest value, 109, is the peak number of trips under way at once, first reached at 08:14.

One minute, eight buses

Every one of the 5,190 times in the Derby file falls on a whole minute, and at 661 different moments one trip ends exactly as another begins. Process the end first and those two never overlap: the peak is 109. Process the start first and the peak becomes 117. Neither rule is wrong, but a program that never states its rule can report either number, and nobody reading the answer will know which it chose.

Two more details keep the answer honest. Some trips run past midnight, and the timetable writes their times as 24:10 or later rather than starting a new day; 21 of the Derby intervals end that way, and a program that reads 24:10 as a mistake loses them. And a trip is scheduled passenger service, not a count of every bus on the road: empty runs between routes are not in the timetable, so 109 describes buses in service, not the whole fleet.

Counting overlaps

Five habits for anything that overlaps in time

Learned on bus trips, used afterwards on room bookings, exam timetables, parking spaces, server connections and any schedule where things run side by side.

Counting overlapping intervals you can trust
HabitWhat it looks likeWhat it prevents
Define start and endSay exactly which moment begins and which ends each intervalTwo programs disagreeing about the same timetable
State the tie ruleDecide whether an end and a start at the same instant overlapA peak that jumps from 109 to 117 with no explanation
Keep late timesTreat 24:10 as ten past midnight on the same service dayLate trips that vanish or appear to run backwards
Sort, do not compareSort the moments once instead of checking every pairOver 3.3 million checks where about 64,000 steps will do
Say what is countedReport scheduled trips in passenger service, not every bus on the roadA timetable count read as a live fleet figure

The fourth habit grows more important with every extra trip. Doubling the number of trips roughly quadruples the pairwise checks but only slightly more than doubles the sweep, which is the difference between a program that copes with one city and one that copes with a country.

Younger learners

A playground timeline of who is on the swings when, and the question of how many swings are ever needed at once.

Teenagers

The timetable file read in Python, trips turned into intervals, the sweep written, and both tie rules tested and explained.

Adults

Capacity and scheduling questions at work, from rooms and staff rotas to connections on a server, answered with a stated rule.

We are not connected with the Department for Transport, the Bus Open Data Service, any bus operator, Derby Museums, the Derwent Valley Mills partnership or the Office for National Statistics. The timetable and boundary are published for public use; the intervals, counts and peaks are our own calculations.

Learning ladder

From a playground timeline to a sweep line

Age is only a first guess at level; the free lesson finds the real one.

Ages 6 to 10

Taking turns

Clocks, timelines and turn-taking games, drawing who is busy when and counting the most at once.

Elementary Maths for Grades 1-5Coding for Kids
Ages 11 to 13

Timelines in code

Times stored as numbers, lists of start and end times, and a first loop that counts what overlaps.

Python and AI for KidsMaths Through Coding
Ages 14 to 18

Sweep-line algorithms

Event sorting, tie rules and maximum overlap on real timetable data, with the pairwise method as a comparison.

Competitive Programming for TeensProblem Solving for Teens
Ages 18 to 67

Scheduling at work

Capacity, rotas and bookings handled with sorted events, complexity in mind and every rule written down.

Data Structures & Algorithms CourseData Analysis Course
Coding and AI

An assistant can read a timetable in seconds. Why should a Derby teenager write a sweep line?

Because the answer rests on a rule nobody wrote down.

Ask an AI tool how many buses Derby runs at its busiest moment and it may produce a confident number. Whether that number is 109 or 117 depends on a tie rule it is unlikely to mention, and whether late-night trips were counted depends on how it read times past 24:00. A learner who has written the sweep knows which questions to put to any figure like that.

Sweep lines also run through the software that AI itself depends on: schedulers deciding which job runs next, calendars spotting clashes, systems tracking how many users are connected at once. Understanding one small, exact algorithm opens the door to all of them.

That is why a Derby teenager should still learn to program in 2026, in the city of the first factory: machines will count anything, but deciding what counts, and saying so plainly, is still the programmer's job. The longer argument is in why teenagers should still learn to code in 2026.

Delivery

Allestree, Normanton or Chaddesden, all from home

Derby is compact, but a lesson that needs no bus at all is simpler still.

Across the city in no time

A learner in Mickleover and one in Chellaston can share a lesson without either of them catching a single bus.

The school stages in use here

Reception, Key Stages 1 to 4, Year 9 options, GCSEs and A levels, named as Derby schools name them, and taught in English.

A free lesson that teaches

The first session is proper teaching on a real task and ends with a suggested level, course and weekly time. There is no card to enter.

Level first, age second

Five to ten learners at one stage, gathered from Derby, the wider UK and abroad, so that every level can find a sensible slot.

A regular weekly pattern

Two lessons a week at a set time, around eight a month, with breaks for holidays and exams arranged with the teacher in advance.

Teachers on a fixed clock

India does not change its clocks, so our teachers are four and a half hours ahead of Derby in British Summer Time and five and a half in winter, which keeps after-school and evening slots inside their day.

Parents learning too

Adults can learn alongside their children in separate groups at their own level, or one to one in the evening; the free lesson is the place to decide which suits a household.

Fees

Derby lesson fees

A free start, then a single monthly fee.

First classUSD 0

A complete lesson with nothing to pay, finishing with a level, a course suggestion and a proposed weekly time.

Group tuitionUSD 100

About eight live lessons each month in a group of five to ten learners at one level.

Private tuitionUSD 150

About eight live lessons each month, taught to one learner with the teacher's full attention.

Outside India the fee is one US dollar amount for everyone, so a family in Darley Abbey pays exactly what a family in Allestree pays, and there is no separate pound tariff. Nothing is charged until the free lesson has settled a course and a slot; the pricing page covers pausing, missed lessons and switching between group and one-to-one teaching.

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Reviews

Six unaltered Google reviews from families we teach

Rated 4.9 across 547 Google reviews. These are real reviews, reproduced as written.

★★★★★

"The one step solution for my son. Modern Age Coders make learning coding so simple that kids love it. The teachers explain complex concepts clearly with practical exercises and interactive content."

Ria Mukherjee

Parent

★★★★★

"Modern Age Coders has been a game-changer for me. I struggled to grasp IT concepts and coding before joining, but their classes transformed everything. I can now confidently write complex programs with ease."

Samriddha Mondal

Student

★★★★★

"One of the most wonderful education centres out there. Education is not limited to school syllabus but focuses on skill development."

Vansh Agarwal

Student

★★★★★

"My child Dhairya is really enjoying the Modern Age Coders classes. This is his first online class and he eagerly looks forward to it. I can already see his improvement, and the teachers are very cooperative."

Sonam Oswal

Parent of Dhairya

★★★★★

"Modern Age Coders have wonderful teachers who teach in a clear, easy and practical way. The teacher boosts students' confidence and inspires them to learn without hesitation."

Sonu Goyal

Parent

★★★★★

"I highly recommend this computer coding class! The teachers are incredibly knowledgeable and passionate about coding."

Ritu Kedia

Parent

Free placement class

Book a first lesson in Derby at no cost

We set the first task by level: a turn-taking timeline for a young child, a first Python program that counts overlaps, or the full Derby bus timetable and a sweep line for a teenager ready for real data.

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FAQ

Derby coding class questions

The questions Derby families ask us most often.

How many people live in Derby?

The 2021 Census counted 261,364 usual residents in the Derby local authority: 256,961 in households and 4,403, or 1.7%, in communal establishments.

Does Derby have many school-age children?

Yes, relative to England. In 2021, children aged 5 to 9 and 10 to 14 each made up 6.5% of residents, against 5.9% and 6.0% nationally, and 22.6% of residents aged five and over were in school or full-time study.

What is the Museum of Making?

A Derby Museums site that tells the city's 300-year history of making, on what is widely regarded as the site of the world's first factory, within the Derwent Valley Mills World Heritage Site. We are not connected with Derby Museums.

What is a sweep line?

An algorithm that sorts the start and end moments of many intervals and passes through them once, keeping a running count. It finds the maximum overlap far faster than comparing every pair.

How many buses run at once in Derby?

In the Bus Open Data Service timetable for Tuesday 22 September 2026, the peak is 109 scheduled trips under way inside the city at once, first reached at 08:14, if a trip ending as another starts is not counted as overlapping. Counted the other way, the peak is 117.

Where does the timetable data come from?

From the Bus Open Data Service, built by the Department for Transport, which provides timetable, location and fares data for every local bus service in England as free open data.

When are Derby lessons held?

After school, in the evening or at weekends, at a UK time agreed during the free lesson. Our teachers are four and a half hours ahead of Derby in summer and five and a half in winter.

Is there a Modern Age Coders centre in Derby?

No. There is no Derby centre and no premises anywhere in the UK; every lesson is taught live online. A learner needs a computer with sound and a reliable connection, and our phone number is Indian.

How much are lessons for Derby learners?

The first lesson is free. After that a group place is USD 100 a month for two live lessons a week, about eight a month, with five to ten learners, and one-to-one lessons on the same pattern are USD 150 a month. Course, format and time are agreed before any charge.

How are Derby groups put together?

By level, pace and goals rather than age or postcode, with five to ten learners at one stage. If no group meets at a workable time, we suggest one-to-one lessons.

Explore the UK

East Midlands neighbours and beyond

Just along the A52, the Nottingham page stretches a rubber band round every tram stop. Coventry links its bus stops into groups and Leeds samples a footfall record fairly. The England guide sets out the school stages, and the UK coding page lists every UK page.

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