AI coding has significantly changed the onboarding of software developers. Now, devs that are familiar with infrastructure, codebase, and database have a huge advantage over newcomers. They simply know how to integrate things and can write more precise requirements for code generation.
What are the other sides of this? Productivity gain from adding developers to the team was always delayed. Now, it might be delayed even more.
While expectations from developers are at an all-time high. We are sharing Lemon.io’s vision of how to speed up onboarding, maximize the developers’ output, and reduce the chances of failure.
True Onboarding Starts (Way) Before Day One
Engineering culture builds the foundation for good onboarding. With a well-documented codebase, clean code principles, code review and testing practices, developer tools centralized in an internal developer platform (IDP) or portal, and automated infrastructure processes to minimize developer overhead, onboarding a junior engineer will be as easy as onboarding a senior engineer.
David Pedreira, CTO of Santander Argentina, explained this in an interview with McKinsey:
…To help your developers build, you need to go from what has traditionally been a confusing series of requests and hurdles to a much simpler self-service model, where approved code and services are ready to go and easy to integrate. A developer portal also handles all the aspects of an application’s life cycle, from the code to managing incidents in production.
By contrast, if you drown in tech debt, legacy technologies, inconsistent code reviews, and manual toil, onboarding a new engineer will feel like fixing prod on Friday: slow, stressful, and far riskier than it should be.
Pro tip: Define where your company stands on the engineering culture scale. And during a technical interview, honestly discuss your engineering practices with the potential hire to get their buy-in.
There are five levels of engineering maturity.
Even though a mature engineering culture makes onboarding easier, it doesn’t automate it. You still have to set up the whole process. Starting with a question: how do you onboard full-time and contract hires?
Full-Time vs. Contractor Onboarding
Direct vs. indirect hires need different onboarding programs. Full-time new employees go through the whole workflow: contracts, benefits, culture, and growth plan. A contractor follows a narrower scope: the legal and HR layer is handled upstream, so the client can skip straight to goals, tools, and first tasks.
The risk with indirect hires is under-onboarding by skipping culture, communication norms, and new team introductions. Whereas for direct hires, the risk is over-onboarding, with tedious paperwork, lengthy docs, and outdated company values.
Getting this balance right is harder than it seems. At Lemon.io, we handle both models: support direct hires for long-term alignment and faster time-to-productivity, and indirect hires with more delivery-focused onboarding.
The rest of this guide focuses on direct hires, who need the most structured onboarding, and where we most often see onboarding friction.
Company Onboarding Flow
#1. Contracts first
Prepare NDAs, IP assignment, compliance forms, and any other specific terms for a developer to sign before their first day to reduce the paperwork overload.
#2. HR and benefits
Discuss how to take time off, public holidays (critical for distributed teams), health coverage timelines, and any L&D or equipment benefits. You shouldn’t assume the new hires will read the handbook; walk them through the practical use cases on a quick call.
#3. First day, first week, and first month expectations
It’s better to write those expectations down. Simply saying that developers have to “do their job” isn’t specific enough. Instead, you can ask a new hire to make their first pull request within three days to help them build confidence. By month one, you can expect that they own at least one scoped feature or technical initiative. By month three, they can debug production issues independently using observability tools. Clear milestones help engineers quickly see their value and stay committed.
#4. Company values
Explain what those values look like on a regular workday. Does “transparency” mean engineers attend roadmap discussions or get notified after decisions are made? Does “autonomy” mean no one reviews their architecture choices? Businesses tend to sugarcoat messy processes with vague values. So if you do follow certain principles, it’s better to show them rather than tell about them.
#5. Business goals briefing
Developers should know what business problem they’re helping solve. If you’re reducing customer churn instances, say so: “We’re prioritizing frontend performance, payment reliability, and event tracking.” If you’re entering a new market: “We need GDPR-safe data handling, EU hosting, and SEPA payments.” Developers who understand the why ask better questions and make better technical decisions.
#6. Personal growth plan
If there’s a real bar-raise process with defined criteria for mid, senior, lead, share it right away and explain how flexible it is, and whether it’s a compulsory thing. If it’s informal, explain what growth has looked like for others on the team.
#7. Expected proactivity level
One team’s “speak up from day one” is another team’s “absorb context before you challenge anything.” State it explicitly: should the developer flag bad architectural decisions in week one, or wait? Can they push back in code review immediately? Silence and overconfidence are both failure modes.
#8. Communication norms
Define the communication rules: async vs. sync culture, expected response times, which channels are for what, and meeting etiquette. A developer who sends a Slack message expecting a reply in 20 minutes, when the team norm is end-of-day async, may feel ignored.
#9. Incident response and on-call
If the developer will be responsible for responding to production issues (system outages, bugs in live code, server problems) outside of normal working hours, tell them this upfront, so that they don’t find out when their phone rings at 2 am.
#10. Assign a buddy and a mentor
A buddy is a peer-level developer. The new hire can ask them anything without feeling judged: “Why does this service exist?” “Is it normal that this takes three days to deploy?” “Am I supposed to attend that meeting?” A mentor is a senior engineer for bigger, longer-term questions and knowledge transfer: “Should I go deep on this part of the stack?” “How do I approach this refactor?”
Best Practices For Smooth Technical Onboarding
After helping clients onboard senior developers across different stacks, team structures, and projects, we’ve prepared a list of practices that can help you speed up technical onboarding.
Pro tip: Technical and company onboarding can run in parallel to save time. There’s no reason to sequence legal and HR paperwork before environment access and team introductions.
Tool access before day one
Prepare a complete access list, repos, CI/CD, error tracking, log monitoring, internal wikis, design files, credentials manager, and assign an owner for each. Also, explain the procurement process for new tools: is there a self-service tier, a designated approver, a review cycle?
Map the whole infrastructure
Walk a new team member through everything: cloud providers and what runs where (mixed AWS/GCP setups are common and confusing), physical servers, version control structure (mono-repo vs. multi-repo), deployment pipeline, third-party integrations, frameworks, libraries, proprietary systems, or internal LLMs.
This is critical for avoiding unnecessary reverse engineering, managing dependencies, and understanding how code decisions impact deployment, performance, security, and the broader system.
Introduce the full team
State clearly who owns backend, frontend, DevOps/SRE, QA, and data. For distributed teams, include time zones and working hours. A developer who knows only the team lead’s name will route every question through one person, slowing the ramp.
Clarify the leadership structure
A fractional CTO available two days a week operates differently from a full-time tech lead. Developers should know the main stakeholders and whether they need to approve tech decisions. If decisions flow through a tech lead rather than a formal manager, say so explicitly.
State the AI coding practices
If your company restricts or bans tools like Claude Code and Cursor (common in regulated industries or with sensitive data), say so on day one. If you actively use them, provide access to AI agents and share what a human review looks like.
Productivity gains from AI coding tools are real, but they should be implemented at the organizational level and not stop at an individual developer’s use.
Surface the tech debt
Give the developer an overview of which parts of the system are fragile, which are actively being refactored, and which are intentional tradeoffs. This helps developers make safer technical decisions and distinguish between bugs, legacy constraints, and deliberate business or architectural compromises.
Step-by-Step Developer Onboarding Process
Below are three practical steps for a successful software engineer onboarding.
Pro tip: Tell the new developer when onboarding officially ends before they start. It sounds like a small detail, but without a clear end date, onboarding becomes an indefinite state. Developers don’t know when they’re expected to perform independently, and managers don’t know when to stop monitoring their every step.
Step 1. Prepare an onboarding plan
Create the onboarding plan for the new developer. Include tasks and projects with descriptions, timelines, and qualitative success metrics (e.g., increase uptime for DevOps; improve API reliability for a backend developer; fix data inefficiencies for a data engineer).
Important to note that expectations from the company onboarding section and the onboarding plan can be two different docs, or you can merge them into one.
Here’s an example of how a developer’s onboarding plan can look:
Step 2. Schedule check-ins on the plan updates
Agree on the weekly or biweekly check-ins on the plan progress and ask developers to fill them in before the meetings. This will help you visualize a developer’s performance and see where they need to improve, get up to speed, slow down, and how you can support them during the process.
Step 3. Book regular feedback sessions
This is an opportunity to share honest feedback on the developer’s code quality, highlight what’s working well, and point out where improvement is needed. A developer can also use this time to share their experience about working with you and the company in general.
Both the manager and the developer should be comfortable giving and receiving feedback honestly. The developer shouldn’t feel like every piece of feedback is a threat to their job, and the manager shouldn’t soften their message to the point where it’s useless.
How Lemon.io Facilitates Developer Onboarding
We at Lemon.io regularly monitor customer and developer feedback to be in the loop of the ups and downs of their cooperation and to timely intervene to fix things. Developers rate their onboarding experience weekly via check-ins and bi-weekly surveys, while we stay in regular contact with the client, proactively checking in at the two-week mark.
We also assign a dedicated CDX manager to each client to ensure clear ownership and accountability throughout the engagement, provide complete support when something doesn’t go as expected, or offer a free developer replacement.
Here’s a dose of appreciative customer feedback about our developers:
He’s [a developer] been great to work with and a huge help on the mobile side. He has strong ownership and the ability to run independently with minimal guidance. He’s also been very communicative, coordinating directly with support and go-to-market teams. Overall, he fits well into our team’s style, where engineers take initiative and drive work forward without needing much oversight!
Our CTO is happy with the work… still learning and getting up to speed, which is normal… the work that he’s doing now with the refactoring is actually helping him a lot to kind of get familiar with the code base… all in all, super happy.
Goals For Onboarding New Software Engineers
Depending on the common developers’ onboarding goals, keep tabs on green and red flags. We’ve prepared a table based on our experience with sourcing vetted senior developers. Some areas may not apply to junior or middle engineers.
Onboarding Goals |
🟢 Green Flags |
🚩 Red Flags |
|---|---|---|
Engagement |
Asks practical questions like “Who is this feature for?”, “What problem does this solve?”, or “How does this affect customers or revenue?” |
Treats work purely as isolated tasks with little product or customer awareness |
Context understanding |
Reads docs, architecture materials, and ADRs proactively |
Repeatedly asks questions already covered in onboarding materials or documentation |
Codebase navigation |
Traces services, dependencies, and existing patterns independently before asking where things live |
Struggles to locate key services, workflows, or dependencies after weeks without escalating confusion |
Learning skills |
Applies code review feedback quickly; recurring technical mistakes decrease as onboarding progresses |
Same mistakes repeat, feedback is ignored, or met defensively |
Engineering judgment |
Notices when implementation, docs, or architecture don’t match reality and flags risks early |
Makes code changes blindly without questioning fragile patterns or hidden dependencies |
Cross-team collaboration |
Coordinates directly with non-engineering teams (support, go-to-market) without being asked |
Works in isolation; routes all communication through the manager |
Communication and proactivity |
Raises blockers early, communicates risks before deadlines and sprint planning, keeps stakeholders informed |
Goes silent when blocked by something and surfaces issues late |
Adaptability |
Learns on the fly when the work demands it; figures out an unfamiliar part of the codebase to get the job done, or proactively asks a mentor for help |
Stalls or asks to be reassigned when work falls outside their comfort zone |
Operational transparency |
Provides updates without prompting, keeps tickets, PRs, and progress visible |
Requires repeated follow-up for status, inconsistent visibility, and disappears between check-ins |
Ramp-up through practical contribution |
Ships small but functional contributions quickly, even low-risk fixes or improvements |
An extended setup phase with little visible output or no meaningful early contribution |
Ownership |
Owns work through testing, deployment, and outcome validation |
Treats code handoff as completion, lacks testing rigor, and shows limited accountability beyond implementation |
The table only works if you’re watching for these signals and have honest conversations when red flags appear, rather than waiting until the probation end date to decide.
The earlier you spot whether a developer is becoming more independent or creating friction, the easier it is to correct course before lost time turns into a failed hire.
