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Application maintenance: how to reduce technical debt
Many organizations run applications that have been developed for years by different teams and suppliers. The system works, but every new change takes longer, costs more and carries more risk.
That is a classic sign of growing technical debt.
The worst decision in this situation is a full rewrite under pressure. The better decision is controlled takeover, stabilization and gradual development. The company keeps business continuity and regains delivery speed at the same time.
How to recognize that technical debt already costs money
Common symptoms:
- a small change takes several weeks,
- regressions appear after most releases,
- nobody fully understands dependencies and module ownership,
- monitoring detects issues only after users report them,
- cloud costs grow faster than traffic and business value.
In practice, the application stops being a growth asset and becomes an operational risk.
Stage 1: takeover and stabilization without revolution
The first 30 days should focus on risk reduction.
What to do immediately
- audit architecture, repositories and CI/CD pipelines,
- inventory dependencies and critical components,
- review permissions, secrets and attack surface,
- deploy basic monitoring: APM, logs and alerts,
- prepare a rollback procedure for releases.
What to avoid at the start
- rewriting entire modules only because they are old,
- introducing a new stack without a migration plan,
- mixing stabilization topics with large features.
At this stage the goal is predictability, not architectural perfection.
Stage 2: organize application development
After stabilization, it is safe to move into a 90-day roadmap.
A practical backlog split:
- 60%: maintenance and risk reduction: incidents, security and tests,
- 30%: functional development aligned with business goals,
- 10%: experiments and proof of concept work.
This model protects the team from returning to chaos. The system is maintained, but the business still receives new functionality.
Example: the cost of technical debt
Assume:
- the team delivers 20 tasks per month,
- because of low quality, 30% of work returns as fixes,
- the average cost of one task is PLN 1,200.
Monthly rework cost:
20 x 0.30 x 1200 = PLN 7,200.
Yearly this is PLN 86,400, without counting business delays.
If one larger production incident per quarter costs another PLN 10,000, the annual “debt tax” exceeds PLN 120,000.
This is why application maintenance and development should be managed as one coherent process.
Metrics that show real progress
Track at least:
- deployment frequency,
- change failure rate,
- MTTR: time from detection to recovery,
- critical bug backlog,
- infrastructure cost per active user,
- lead time for a business change.
These metrics connect CTO, operations and business perspectives.
Safe modernization step by step
1. Separate the highest-risk modules
Do not modernize everything at once. Start where incidents are frequent or where development is blocked.
2. Add tests where pain is highest
Begin with critical paths: login, payments, orders, integrations and permissions.
3. Standardize releases
Feature flags, staged rollout and automated rollback reduce production risk without blocking delivery speed.
4. Reduce infrastructure maintenance cost
Query optimization, caching and resource lifecycle cleanup often bring faster results than large architectural migrations.
A long-term IT cooperation model
For existing applications, the best model usually has three streams:
- Run: maintenance, incidents, security and SLA,
- Change: feature development and optimization,
- Governance: priorities, reporting and architectural decisions.
Clear RACI is also critical: who decides, who implements, who accepts risk and who is informed.
Without this, every incident ends with a discussion about ownership instead of recovery.
How to connect application, website and IT operations
Many companies separate responsibility:
- one supplier for the application,
- another for the website,
- another for infrastructure and security.
This usually increases handoffs and delays response. More companies move to one partner responsible for managed IT, application maintenance and website maintenance.
If you want to see the website side of this process, read:
If you are choosing a cooperation model, read:
Quick checklist for the first 14 days after takeover
- secure owner access to repositories, cloud, domains and CI/CD tools,
- identify the 10 most frequent errors from the last three months,
- confirm that backup and database recovery work,
- start monitoring critical endpoints and alerts,
- confirm that a release can be rolled back within minutes,
- document a minimal incident runbook for the whole team.
This checklist does not solve every problem, but it gives operational control during the most difficult takeover period.
Summary
Maintaining an existing application does not have to mean endless firefighting. The key steps are:
- fast stabilization and risk reduction,
- prioritized development roadmap,
- continuous monitoring of technical and business metrics,
- one responsible IT support model.
If your organization needs this end-to-end approach, see IT Partner.