Software developer salaries: the hidden cost of underpaying a team

There is no single useful developer salary

“Average software developer salary” is a starting point for research, not a pay decision. Compensation varies by region, experience, discipline, market, security clearance, on-call responsibility, sector and the total package of pension, leave, bonus, equity and flexibility.

For context, the Office for National Statistics reported UK median gross annual earnings of £39,039 for full-time employee jobs in April 2025. That is a benchmark for all full-time employee jobs, not a software-developer rate. It shows why a broad national figure cannot establish a fair offer for a specialised engineering role.

Use several comparable data points: current official occupation data, credible role-specific salary surveys, recent offers and interviews in the relevant location, and the pay of existing colleagues doing comparable work. Record the range and the reasoning, rather than presenting one number as objective truth.

• Office for National Statistics: Employee earnings in the UK, 2025 ↗

Use level and region to create rough planning bands

The following indicative base-salary bands are a UK planning aid for permanent generalist software-development roles in 2026. They are deliberately broad. They exclude bonus, equity, pension value, contractor rates and unusual premiums for finance, security-cleared work, scarce specialisms or heavy on-call responsibility.

They should be checked against current local evidence before an offer is made. The ONS publishes annual occupation data nationally and by region, but its occupational groupings do not map neatly to every company’s junior, mid, senior and principal career levels. Use the bands to start a conversation, then calibrate them with current comparable roles.

• ONS ASHE Table 14: earnings by four-digit occupation ↗
• ONS ASHE Table 15: earnings by region and four-digit occupation ↗

Level                 Most UK regions     Major cities / remote     London
Junior / early-career  £30k to £45k        £35k to £50k             £40k to £60k
Mid-level              £45k to £65k        £55k to £80k             £60k to £90k
Senior                 £60k to £85k        £70k to £100k            £80k to £120k+
Staff / principal      £80k to £105k+      £90k to £130k+           £110k to £160k+

These are rough planning ranges, not a promise of market rate.

Pay is part of a wider employment proposition

Salary matters because it is predictable, comparable and immediate. It is also not the whole proposition. A role with fair pay, useful work, capable colleagues, reasonable autonomy, learning support, flexible arrangements and a sustainable on-call expectation may compete well with a higher salary attached to poor working conditions.

The reverse is also true. Employers sometimes describe an attractive mission, a friendly culture or future growth as compensation for a below-market salary. Those things may be genuinely valuable, but they do not pay a mortgage or remove the risk carried by a difficult role.

Be explicit about the whole package and the work expected. If a role includes regular out-of-hours support, management responsibility, legacy-system ownership or scarce specialist knowledge, those obligations should influence the offer and the team capacity around it.

Underpaying makes hiring slower and less selective

A materially uncompetitive range shrinks the pool of people who can seriously consider a role. The company may receive many applications, but fewer candidates with the relevant experience will accept an interview or offer. Hiring managers then spend more time screening and restarting searches.

When a vacancy is urgent, the pressure to compromise can grow. A team may hire for a weaker fit, rely heavily on contractors at a higher day rate, or leave a critical role open while existing staff absorb the work. None of these outcomes is automatically wrong, but they are costs that a salary budget can hide.

A clear, realistic range also improves the candidate experience. It avoids late-stage disappointment and lets both sides decide early whether the scope, expectations and package are compatible.

Attrition loses context as well as capacity

When an experienced engineer leaves, the immediate gap is not simply one person’s output. They may hold knowledge of production behaviour, customer history, awkward integrations, past incidents, deployment risks and the reasons behind non-obvious code.

That knowledge can be documented and shared, but replacing it still takes time. Remaining colleagues answer questions, review work, cover on-call and carry the emotional cost of another departure. Delivery plans may look unchanged on a spreadsheet while the team has less capacity to improve and operate the service safely.

Retention is not achieved by salary alone. Fair pay removes one avoidable reason to leave. Clear progression, good management, manageable workload and work that people can be proud of are what make staying a positive choice.

Cheap staffing can increase the cost of change

A team that is persistently under-resourced or struggling to retain experienced people often has less time for tests, documentation, observability and careful design. Work still ships, but the system becomes harder to understand and more expensive to change.

This is not a claim that lower-paid engineers produce lower-quality work. Pay does not measure individual ability or care. The organisational risk is that a business sets a price that cannot reliably attract and retain the experience the work requires, then asks the team to compensate through overtime and improvisation.

The resulting technical debt has a financial effect. Incidents take longer to resolve, estimates include more uncertainty, changes require more coordination and customer-facing improvements wait behind recovery work.

Calculate the total cost, not only the salary delta

A pay decision should compare the additional salary with the cost of the realistic alternatives. Those alternatives include recruitment fees, interview time, contractor cover, vacancies, onboarding, delayed delivery, lost domain knowledge and the risk of failure in a critical service.

Not every retention decision should be made by matching an external offer. The company needs a coherent pay structure and budget. But refusing to review a known market gap because a person has not yet resigned is a false saving if the likely replacement cost and delivery disruption are larger.

Use ranges and scenarios rather than pretending the calculation is exact. The goal is a better decision: what capability does the team need, what will it take to keep or hire it, and what is the cost of not doing so?

Compare:
  - Cost of adjusting the role to a fair market range
  - Recruitment and interview time
  - Vacancy and contractor-cover cost
  - Onboarding and reduced team capacity
  - Delayed roadmap or operational-risk cost

Then ask:
  Which option gives the team the capability it needs over the next 12 to 24 months?

Technical retaliation turns a shared system into leverage

When people feel undervalued, ignored or trapped in a conflict, the damage does not always appear as an open argument. It can show up in the codebase: opaque implementations, missing tests, undocumented manual steps, deliberate coupling, avoidable complexity or changes that work just well enough to be hard for the next team to challenge.

Intent can be difficult to prove, and poor engineering practice is often caused by time pressure, weak review or lack of experience rather than malice. The practical risk is the same: a system becomes dependent on a few people, routine changes become risky and the cost of recovering control is passed to colleagues and users.

When those people or teams move on, the next team inherits a service they cannot safely change or explain. The work is then treated like hot potato: each group makes the minimum change needed to meet its immediate deadline and passes the deeper risk onward. That pattern increases delivery cost, incident risk and frustration until someone is finally funded to take ownership of the underlying problems.

Do not respond by assuming bad faith or policing every line of code. Build conditions that make damaging practices visible early: clear ownership, constructive review, realistic time for testing and documentation, shared operational knowledge, paired work on sensitive areas and an escalation route for concerns that does not punish the person raising them.

Watch for repeated patterns such as:
  - Critical changes with no tests, explanation or handover
  - One person or team being the only route to deploy, diagnose or change a service
  - Unnecessary private abstractions or undocumented manual workarounds
  - Review feedback that identifies a risk but is routinely bypassed
  - Work described as too complex for anyone else to understand

Response:
  Share ownership, document the boundary, add evidence and address the conditions behind the pattern.

Build a fair and durable pay practice

Define salary ranges by role, level and location or working arrangement. Explain how people progress through a range, how performance and increased scope affect pay, and when the company reviews external market evidence. This makes pay less dependent on who negotiates hardest or knows when to ask.

Check for inconsistencies across comparable roles and investigate them. A transparent process does not require publishing every individual salary, but it does require managers to be able to explain how pay decisions are made and how people can grow.

Review the team’s capability alongside compensation. If the roadmap depends on senior technical judgement, reliable live-service ownership or specialist domain knowledge, budget for it deliberately. A sustainable team is an operating investment, not a cost to minimise in isolation.

• Benchmark against comparable roles, not a single national average
• Consider salary, total package, role scope and on-call expectations together
• Treat recruitment, vacancy, onboarding and lost knowledge as real costs
• Use clear salary ranges and progression criteria
• Do not rely on overtime to cover a persistent capability gap
• Review pay fairness across comparable roles
• Budget for the experience required to operate and change important systems safely